Re: Fun BTRFS Stuff:

2016-02-24 Thread Duncan
Henk Slager posted on Thu, 25 Feb 2016 03:07:12 +0100 as excerpted: > On Tue, Feb 23, 2016 at 1:19 AM, Duncan <1i5t5.dun...@cox.net> wrote: >> >> I've not seen anyone else explicitly list the following as a practical >> btrfs send/receive backup strategy, bu

Re: Documentation for BTRFS error (device dev): bdev /dev/xx errs: wr 22, rd 0, flush 0, corrupt 0, gen 0

2016-02-23 Thread Duncan
there) That /is/ surprising. No explanation, there, tho I don't know enough about such errors to know if they /always/ tend to show up in the logs, or not, only that mine generally have. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master --

Re: Documentation for BTRFS error (device dev): bdev /dev/xx errs: wr 22, rd 0, flush 0, corrupt 0, gen 0

2016-02-23 Thread Duncan
Duncan posted on Tue, 23 Feb 2016 23:17:06 + as excerpted: > Marc MERLIN posted on Tue, 23 Feb 2016 13:59:11 -0800 as excerpted: > >> I have a freshly created md5 array, with drives that I specifically >> scanned one by one block by block, and for good measure, I also sca

Re: Documentation for BTRFS error (device dev): bdev /dev/xx errs: wr 22, rd 0, flush 0, corrupt 0, gen 0

2016-02-23 Thread Duncan
ers here with far more knowledge in that area, including what to do to try to fix it, than I have, and the various options to fix it have been posted multiple times by now, and likely will be posted here again. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program ha

Re: [PATCH v2 1/2] btrfs-progs: copy functionality of btrfs-debug-tree to inspect-internal subcommand

2016-02-22 Thread Duncan
ck the topic link on the left to see the individual patches, which here don't include individual changelogs as they're in the 00/19 post.) http://permalink.gmane.org/gmane.comp.file-systems.btrfs/53306 -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a l

Re: Fun BTRFS Stuff:

2016-02-22 Thread Duncan
rieval of individual files isn't envisioned. Obviously for glacier or similar storage, an intermediate encryption step could be added, with encryption to whatever strength deemed appropriate, if considered necessary to thwart the NSA and similar nation-level advanced- persistent-threats on clou

Re: [PATCH] btrfs-progs: restore: make btrfs restore able to read a file which lists files to restore

2016-02-22 Thread Duncan
but as someone who appreciates the usefulness of btrfs restore, I definitely like the idea! =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this lis

Re: Major HDD performance degradation on btrfs receive

2016-02-22 Thread Duncan
reate trivial patches to accomplish that tweak, even if it's not exactly the code a real C coder would choose to use, which is exactly what I've done here. So now, unless some other atime option is specified, my filesystems are all mounted noatime. =:^) -- Duncan - List replies preferr

Re: [PATCH] Btrfs: ctree: added lines after variable declarations

2016-02-22 Thread Duncan
the bottom, or interleaved in context under each point you're replying to, further replies and their context would have been far clearer for others reading and replying.) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if

Re: [Question]: Contributing to btrfs

2016-02-21 Thread Duncan
under development userspace HEAD code. Or just do what I did and browse around a bit until you figure out which of the listed repos you're actually after. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program,

Re: btrfs send error

2016-02-18 Thread Duncan
le and simply hasn't made it into a stable release yet, that's understandable, tho having it specifically stated, thus making waiting for it to hit stable an option, would be nice. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a mas

Re: [Docs]? Only one Subvolume with DUP (or different parameters)?

2016-02-16 Thread Duncan
hile stabilizing, isn't yet full stable and mature yet, even if it means a bit more hands-on administration than would simply shoving everything in the same basket and hoping the bottom doesn't drop out of it. Tho that might be just me... -- Duncan - List replies preferred. No H

Re: RAID 6 full, but there is still space left on some devices

2016-02-16 Thread Duncan
balance to full-width stripes anything that's not yet full width, thereby evening out your usage. A full balance /should/ do it as well, I believe, but with raid56 support still not yet at the maturity level of btrfs in general, it's likely your version is old and buggy in that rega

Re: Unable to mount BTRFS home dir anymore

2016-02-16 Thread Duncan
ause you can't follow it or because it simply doesn't work in your case, you may be out of luck and will need to use your backups even if they aren't current, unless one of the devs takes an interest and you can build and run various debugging patches to trace down the problem furth

Re: Major HDD performance degradation on btrfs receive

2016-02-16 Thread Duncan
useful, tho I'm snipping them here. One more tip. Btrfs quotas are known to have scaling issues as well. If you're using them, they'll exacerbate the problem. And while I'm not sure about current 4.4 status, thru 4.3 at least, they were buggy and not reliable anyway.

Re: Out of memory purging snapshots

2016-02-14 Thread Duncan
e applied there. It's likely someone else tracking that bug and patch closer than I am (my use-case doesn't involve snapshotting or subvolumes) will be along shortly with further details and likely a link to the patch, but meanwhile, yes, I think that's the bug that has already

Re: enospc while having a lot of free space with kernel 4.4

2016-02-13 Thread Duncan
Stefan Priebe posted on Sat, 13 Feb 2016 07:51:03 +0100 as excerpted: > while running 4.4 i got the following enospc error today: I don't see the usual btrfs fi sh and btrfs fi df output included, that would show exactly what btrfs thought the free-space situation was. -- Dunca

Re: Is there now a way to migrate FS without losing shared COW blocks between subvolumes?

2016-02-13 Thread Duncan
#x27;re looking for is btrfs send -c. You're still sending a subvolume, but the -c says to consider the supplied clone- src parameter for just that, cloned, aka shared, sources, and unlike -p parent, multiple such -c cloned-src options are allowed, so... -- Duncan - List replies preferred.

Re: [PATCH] btrfs: change max_inline default to 2048

2016-02-11 Thread Duncan
e performance efficiency of separate data/metadata on files of any significant size, where the proportional space wastage of sub-block tails will be far smaller.) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the p

Re: "layout" of a six drive raid10

2016-02-08 Thread Duncan
at once if it's an even number of devices with space left, all but one if it's an odd number with space left, since both copies can't be on the same device, which means that odd device can't be used for that allocation round, tho it will be for the next, and a different devi

Re: Use fast device only for metadata?

2016-02-08 Thread Duncan
rious issues over some time. Of course these days I use multi-device btrfs directly, no mdraid, and a multi-device btrfs root unfortunately does seem to require an initr*, but its other advantages outweigh the additional complexity of having to use an initr*, so... -- Duncan - List replies pr

Re: Use fast device only for metadata?

2016-02-07 Thread Duncan
it doesn´t need to recreate > the filesystem. > > I wonder what happened to the VFS hot data tracking stuff patchset > floating around here quite some time ago. AFAIK it's still around, and very possibly in-use by some major user. I believe it's still on the btrfs roadmap a

Re: BTRFS RAM requirements, RAID 6 stability/write holes and expansion questions

2016-02-06 Thread Duncan
add one device at a time, you may come to a point where there's no longer unallocated space on older devices, only on new devices, and there's not at least four of them, so btrfs will be unable to allocate additional raid6 chunks, and the space on the odd new devices will be unusable

Re: btrfs-progs4.4 with linux-3.16.7 (with truncation of extends patch)

2016-02-05 Thread Duncan
16 (the LTS previous to 3.18 was 3.14, which is definitely too far back to be considered reasonable to still be running btrfs on, list-perspective anyway), I believe the best recommendation for your users as well, would be to either run a newer kernel if they're comfortable with that, o

Re: btrfs partition spontaneously corrupted - No recovery options. Kernel oops / "Kernel Bug"?

2016-02-04 Thread Duncan
ted, and again, preferably newer than that, 4.1 series or newer, up to the current 4.4, as current userspace can normally be used with older kernels without issue except for mkfs.btrfs, where you'll want to specify options to be compatible with older kernels that didn't have code for newer on

Re: Question about a specific error.

2016-02-04 Thread Duncan
are, either. The errors bitmask is obviously targeted at devs who can read the code and see what each bit means, and to my knowledge there's no table posted on the wiki or wherever for non-devs to look it up. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree pro

Re: booting from BTRFS works only with one device in the pool

2016-02-01 Thread Duncan
d get that patch thru the approval process and into kernel mainline. In that case there's three options, and I dearly wish someone with the necessary kernel level coder qualification would take that third option, making initr*less multi- device btrfs / a viable option for the rest of u

Re: "WARNING: device 0 not present" during scrub?

2016-01-31 Thread Duncan
/real/ bugs being fixed every release. Thus, the general recommendation, on-list at least, is to pick one or the other, and if you pick old and stale^h^hble, forget about btrfs for the time being. Again, what your distro may support and whether you choose to use that support is between you an

Re: Confining scrub to a subvolume

2016-01-06 Thread Duncan
Sree Harsha Totakura posted on Mon, 04 Jan 2016 12:01:58 +0100 as excerpted: > On 12/30/2015 07:26 PM, Duncan wrote: >> David Sterba posted on Wed, 30 Dec 2015 18:39:49 +0100 as excerpted: >> >>> On Wed, Dec 30, 2015 at 01:00:34AM +0100, Sree Harsha Totakura wrote: >&g

Re: Unrecoverable fs corruption?

2016-01-05 Thread Duncan
Christoph Anton Mitterer posted on Mon, 04 Jan 2016 01:05:02 +0100 as excerpted: > On Sun, 2016-01-03 at 15:00 +0000, Duncan wrote: >> But now that I think about it, balance does read the chunk in ordered >> to rewrite its contents, and that read, like all reads, should normally

Re: Add big device, remove small device, read-only

2016-01-05 Thread Duncan
Rasmus Abrahamsen posted on Fri, 01 Jan 2016 21:20:13 +0100 as excerpted: > I accidentically sent my messages directly to Duncan, I am copying them > in here. > > Hello Duncan, > > Thank you for the amazing response. Wow, you are awesome. Just a note to mention that real li

Re: Btrfs Check - "type mismatch with chunk"

2016-01-05 Thread Duncan
Christoph Anton Mitterer posted on Sat, 02 Jan 2016 06:12:46 +0100 as excerpted: > On Fri, 2015-12-25 at 08:06 +0000, Duncan wrote: >> I wasn't personally sure if 4.1 itself was affected or not, but the >> wiki says don't use 4.1.1 as it's broken with this bug, with

Re: evidence of persistent state, despite device disconnects

2016-01-05 Thread Duncan
post, but if you say you didn't... then it's all down to duplication and finding why it's suddenly reverting to single mode on non-degraded mounts, which indeed /is/ a bug. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master

Re: Unrecoverable fs corruption?

2016-01-03 Thread Duncan
needed. While you mentioned below this part in your reply that you had tried degraded,ro, that wasn't in your original post, so we wanted the mount options you had actually tried, to see if you had tried degraded,ro, or not. -- Duncan - List replies preferred. No HTML msgs. "Eve

Re: Unrecoverable fs corruption?

2016-01-03 Thread Duncan
he operational line, so there's no chance of typoing something different than the confirmed version. [2] Dual raid1 working and backup copies on a pair of partitioned devices: My setup is actually rather somewhat more complex than that, but the details are not apropos to this discussion. --

Re: Unrecoverable fs corruption?

2016-01-03 Thread Duncan
Christoph Anton Mitterer posted on Sat, 02 Jan 2016 05:32:21 +0100 as excerpted: > On Fri, 2016-01-01 at 08:13 +0000, Duncan wrote: >> you can also try a read-only scrub > OT: I just wondered, would a balance include everything a scrub includes > (i.e. read+verify all data and re

Re: WARNING CPU at linux/fs/btrfs/ioctl.c:558 create_subvol BTRFS Transaction aborted (error -2)

2016-01-03 Thread Duncan
Doesn't solve your transaction aborted situation, but should provide a bit more information on those specific subvols/subdirs and why snapper or systemd is trying to create them. --- [1] Read-only mounte /: I keep my / mounted read-only by default, only mounting it writable when I want to up

Re: evidence of persistent state, despite device disconnects

2016-01-03 Thread Duncan
I shouldn't have to do that to > refresh Btrfs's state anytime I disconnect and connect devices just to > make sure it doesn't sabotage the devices by surreptitiously adding > single chunks to one of the drives! Based on the evidence, I'd guess that you actually m

Re: btrfs scrub failing

2016-01-01 Thread Duncan
till be way more posts about it if so, but confirmation's always good), nothing to do but wait for a fix, while if not, and you still have your problem, then it's a different issue and the devs will need to work with you on a fix specific to your problem. -- Duncan - List replies

Re: Add big device, remove small device, read-only

2016-01-01 Thread Duncan
that are rare or don't happen at all on native-created btrfs, and it's often balance that exposes these problems. If you created with mkfs.btrfs, at least we don't have to worry about the whole set of conversion-related problems. Meanwhile, depending on the problem, a reboot will l

Re: btrfs send clone use case

2016-01-01 Thread Duncan
change thrown in at the normal receive side before the send, I'd actually have been surprised if it /didn't/ work as you outlined. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master

Re: Unrecoverable fs corruption?

2016-01-01 Thread Duncan
Chris Murphy posted on Thu, 31 Dec 2015 18:22:09 -0700 as excerpted: > On Thu, Dec 31, 2015 at 4:36 PM, Alexander Duscheleit > wrote: >> Hello, >> >> I had a power fail today at my home server and after the reboot the >> btrfs RAID1 won't come back up. >> >> When trying to mount one of the 2 disk

Re: btrfs scrub failing

2015-12-31 Thread Duncan
alf was typical, so it's likely my scrubs were simply done before whatever the problem was could trigger. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubs

Re: RAID10 question

2015-12-31 Thread Duncan
IOW, you have to choose between btrfs raid1 with data integrity repair on top, with only two mdraid0's underneath, or btrfs raid0 with only data integrity detection, not repair, on top, and a bunch of mdraid1 that don't have data integrity at all, underneath. -- Duncan - List replies

Re: quota rescan hangs

2015-12-31 Thread Duncan
ou could potentially enable them on 4.4 as an LTS kernel, as well as 4.6. But that of course is assuming there's no known or new quota issues in 4.4 or 4.5, and we don't know that yet, so it could be well beyond 4.6 before they're actually stable enough to depend on. -- Dunca

Re: BTRFS - Write Barriers

2015-12-31 Thread Duncan
t as far away from it as you do the uninsulated live service mains coming into your building... on the SUPPLY side of the voltage stepdown transformer! And for those that don't do that, well, there's Darwin awards. -- Duncan - List replies preferred. No HTML msgs. "Every non

Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size

2015-12-30 Thread Duncan
t in case of a crash during > reshaping, these files are (likely) garbage then right? > Not particularly desirable... For something like that, it'd pretty much /have/ to be done as COW, at least at the chunk level, tho the address from the outside may stay the same. That's w

Re: Confining scrub to a subvolume

2015-12-30 Thread Duncan
Christoph Anton Mitterer posted on Wed, 30 Dec 2015 20:28:00 +0100 as excerpted: > On Wed, 2015-12-30 at 18:26 +0000, Duncan wrote: >> That should work.  Cat the files to /dev/null and check dmesg.  For >> single mode it should check the only copy.  For raid1/10 or dup, >&g

Re: Confining scrub to a subvolume

2015-12-30 Thread Duncan
PID. Errors will show up in dmesg, as well as cat's STDERR. Pretty clever thinking there. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from

Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size

2015-12-29 Thread Duncan
Duncan's usual "stable or not" talk > (@Duncan, I think by now, you should have made it into some verse or > ballad form... :D for general pleasure ;) ) =:^) The devs did remove most of the experimental warnings some versions ago. I guess they missed that one. The "heavy

Re: Btrfs Check - "type mismatch with chunk"

2015-12-28 Thread Duncan
o, you could run current btrfs release userspace and release or rc kernels, and simply be prepared to build a live-git version or possibly revert to an older version, if you run into a bug where it's necessary. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program h

Re: should btrfsck fix a bad superblock?

2015-12-28 Thread Duncan
repair it fixes certain bad fields in them. What you want to actually recover bad superblocks from good copies is btrfs rescue super-recover. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master.&q

Re: [bug] btrfs fi usage reports bogus 16EiB free space

2015-12-28 Thread Duncan
retching... I remember when the memory in my machine first surpassed the size of the entire hard drive I had in my first 486sx25, 4 MiB RAM, 130 MB hard drive... and I counted myself lucky just to get a 486 instead of a 386... Yes, there's kids messing up my lawn too; I shout and shake my

Re: https://btrfs.wiki.kernel.org having OCSP issues?

2015-12-28 Thread Duncan
Duncan posted on Mon, 28 Dec 2015 10:34:49 + as excerpted: >> On Mon, 28 Dec 2015 09:20:09 + (UTC) >> Duncan <1i5t5.dun...@cox.net> wrote: >> >>> Firefox is currently giving me OCSP errors for the wiki. Whatever the problem was, it seems to be fixed, now

Re: https://btrfs.wiki.kernel.org having OCSP issues?

2015-12-28 Thread Duncan
Roman Mamedov posted on Mon, 28 Dec 2015 14:29:43 +0500 as excerpted: > On Mon, 28 Dec 2015 09:20:09 + (UTC) > Duncan <1i5t5.dun...@cox.net> wrote: > >> Firefox is currently giving me OCSP errors for the wiki. Links has no >> problem, presumably because it d

https://btrfs.wiki.kernel.org having OCSP issues?

2015-12-28 Thread Duncan
Firefox is currently giving me OCSP errors for the wiki. Links has no problem, presumably because it doesn't validate the cert or ignores OCSP timeouts, but lynx is throwing errors as well, so it's not just firefox. Others? What's up? -- Duncan - List replies preferred.

Re: [PATCH] improve documentation of snapshot unaware defrag

2015-12-28 Thread Duncan
Hugo Mills posted on Mon, 28 Dec 2015 01:58:07 + as excerpted: > On Mon, Dec 28, 2015 at 01:50:09AM +0100, Christoph Anton Mitterer > wrote: >> On Sun, 2015-12-27 at 07:09 +, Duncan wrote: >> > raid1 mode >> I wonder when that reaches my pain threshold... a

Re: [PATCH] improve documentation of snapshot unaware defrag

2015-12-27 Thread Duncan
Christoph Anton Mitterer posted on Mon, 28 Dec 2015 04:03:05 +0100 as excerpted: > On Mon, 2015-12-28 at 02:51 +0000, Duncan wrote: >> 1) Btrfs very specifically and deliberately uses *lowercase* raidN in >> part to make that distinction, as the btrfs variants are chunk- level &

Re: How to change BTRFS filesystem UUID

2015-12-27 Thread Duncan
ecent version of btrfs-progs, however, as btrfs restore has notably improved over time, with the last fix to it in 4.2.3, an off-by- one fix to the symlink restoration code added in 4.0.1, and 4.0 added metadata (time/mode/uid/gid) restoration, where before that files were restored with the owners

Re: Btrfs scrub failure for raid 6 kernel 4.3

2015-12-27 Thread Duncan
Waxhead posted on Mon, 28 Dec 2015 03:04:33 +0100 as excerpted: > Duncan wrote: >> Waxhead posted on Mon, 28 Dec 2015 00:06:46 +0100 as excerpted: >> >>> btrfs scrub status /mnt >>> scrub status for 2832346e-0720-499f-8239-355534e5721b >>>

Re: [BUG?] btrfs scrub -d doesn't scan all devices

2015-12-27 Thread Duncan
quote of the manpage. So how is it not the text I quoted? It's in quotation marks attributed with "the manpage specifically says", my own rewording is marked as the manpage _"suggests"_ (with the choice of "suggests" as opposed to "says" and quote marks

Re: [BUG?] btrfs scrub -d doesn't scan all devices

2015-12-27 Thread Duncan
Christoph Anton Mitterer posted on Mon, 28 Dec 2015 02:21:28 +0100 as excerpted: > On Sun, 2015-12-27 at 07:22 +0000, Duncan wrote: >> I'd call that NOTABUG.  As the btrfs-scrub manpage suggests: >> >> * When you point scrub at a mountpoint, it scrubs all devices co

Re: [PATCH] improve documentation of snapshot unaware defrag

2015-12-27 Thread Duncan
Christoph Anton Mitterer posted on Mon, 28 Dec 2015 01:50:09 +0100 as excerpted: > On Sun, 2015-12-27 at 07:09 +0000, Duncan wrote: >> raid1 mode > I wonder when that reaches my pain threshold... and I submit a patch > that renames it "notreallyraid1" in all places ;-)

Re: Btrfs scrub failure for raid 6 kernel 4.3

2015-12-27 Thread Duncan
ble, and indeed, that'd be the biggest reason to run N-way-mirroring with N>2 in the first place. But regardless, agreed with everyone, simply crashing must be seen as a bug. If it's not going to scrub correctly, it should exit normally but with an error status and printout to STDERR,

Re: Btrfs scrub failure for raid 6 kernel 4.3

2015-12-27 Thread Duncan
tart) seems to be in POSIX time. Is it possible you were or are running the scrub from, for instance, a rescue image that might not set the system time correctly and that falls back to, say, the date the rescue image was created, if it can't get network connectivity or some such? -- Duncan - Li

Re: Btrfs scrub failure for raid 6 kernel 4.3

2015-12-27 Thread Duncan
iple USB-attached devices can get out of sync with each other, breaking the filesystem. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list:

Re: How to change BTRFS filesystem UUID

2015-12-27 Thread Duncan
ltiple devices on the commandline is even supported. However, these sorts of commands only tend to be run very deliberately and under very specific circumstances, and thus are unlikely to be run when one is working with multiple images of a device that shouldn't be combined into the same

Re: [BUG?] btrfs scrub -d doesn't scan all devices

2015-12-26 Thread Duncan
-*/* are symlinks to various block-device nodes, it follows that if you point scrub at them, only the device pointed at is scrubbed, exactly as one might expect based on the manpage. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if

Re: [PATCH] improve documentation of snapshot unaware defrag

2015-12-26 Thread Duncan
cuse too. But by contrast it can be noted that I posted right away when I noticed the mkfs.btrfs manpage totally lost raid1 mode with one update, because I use it, regardless of what else I was doing. I guess that must have hit my pain threshold... -- Duncan - List replies preferred. No HTML

Re: btrfs problems on new file system

2015-12-26 Thread Duncan
r it part of the same filesystem, thus potentially causing corruption if it's a snapshot or something that's not actually supposed to be part of the (current) filesystem. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you

Re: btrfs problems on new file system

2015-12-25 Thread Duncan
at device, there were a *LOT* more spare sectors than I had imagined there'd be. At 85% I had replaced several MiB worth, at half a KiB per sector, 2000 sectors per MiB, and it looked to have 100 to perhaps 128 MiB or so of spare sectors, on a 238 GiB ssd. I'd have guessed perhaps 8-

Re: Deadlock after upgrade to 4.1

2015-12-25 Thread Duncan
on patch backlog, so it's possible it's already in the queue. Thanks for the report, particularly because as I said, others are likely to be upgrading ATM as well due to the status changes when 4.4 releases. I'm sure the devs will be looking at it. -- Duncan - List replies pref

Re: Btrfs Check - "type mismatch with chunk"

2015-12-25 Thread Duncan
covici posted on Fri, 25 Dec 2015 00:28:09 -0500 as excerpted: > Duncan <1i5t5.dun...@cox.net> wrote: > >> How long have you had the filesystem? Was it likely created with the >> mkfs.btrfs from btrfs-progs v4.1.1 (July, 2015) as I suspect? If so, >> you have a p

Re: Raid 5/6 Stability

2015-12-24 Thread Duncan
jwalmer posted on Thu, 24 Dec 2015 08:56:15 -0500 as excerpted: > Thanks for the speedy replies! Earlier Duncan said, "there's still no > user-side multi-device filesystem health monitoring application." I'm > mostly worried about device errors/failu

Re: Loss of connection to Half of the drives

2015-12-24 Thread Duncan
emented, and this one simply hasn't been a priority for existing developers, given the other features they've found to be more pressing. But it may indeed eventually come, five or ten years out, sooner if a suitable developer with suitable interest and social compatibility with existing de

Re: Btrfs Check - "type mismatch with chunk"

2015-12-24 Thread Duncan
you didn't create the filesystem with the buggy mkfs.btrfs from v4.1.1, there's likely some other problem to root out, but I'm guessing you did, and thus have the bad filesystem the patched btrfs check is designed to report, and that report is indeed valid.) -- Duncan - Li

Re: ssd not detected on ssd drive

2015-12-24 Thread Duncan
t smaller than I'd like, so next time I repartition, I'll probably make them 384 MiB each instead of 256 MiB, taking the space from my /var/log partition, which is 512 MiB raid1 but never even half used unless I have a runaway logger event, so shrinking it to 384 MiB as well, to give t

Re: Raid 5/6 Stability

2015-12-23 Thread Duncan
n a server where the user and/or admin is unlikely to be directly observing things and thus know when things go wrong due to the observed change in behavior, regardless of formal monitoring or the lack thereof, as would likely be the case on a desktop/workstation. -- Duncan - List replies prefer

Re: btrfs und lvm-cache?

2015-12-23 Thread Duncan
ple btrfs raid1 on two partitions on the same physical device) would have on spinning rust. I thought I'd throw those points out, in case you had failed to notice bcache as an option and would prefer it as better tested, once you knew about it, and in case the partitioned ssd idea does

Re: Loss of connection to Half of the drives

2015-12-23 Thread Duncan
a larger scope than the limited one-future-option scope that I had originally intended. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list

Re: Loss of connection to Half of the drives

2015-12-23 Thread Duncan
fs N-way-mirroring will provide, in the longer term once btrfs gets that feature and it stabilizes to usability, is the ability to actually have three cabinets, and sustain the loss of two, or four cabinets, and sustain the loss of three, etc. -- Duncan - List replies preferred. No

Re: Raid 5/6 Stability

2015-12-23 Thread Duncan
any help you can be in editing the wiki is highly appreciated, and you don't have to worry too much about any mistakes you inadvertently make, as others will be along to fix them. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master --

Re: Loss of connection to Half of the drives

2015-12-22 Thread Duncan
nearest comparable solution isn't quite as direct, a btrfs raid1/5/10 (or btrfs raid6 for double set loss), on top of mdraidN. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master.

Re: defrag vs autodefrag

2015-12-22 Thread Duncan
all effect is very > similar to the effect you'd have from writing to the file without > autodefrag. > > And I am now better informed than I was before. :) And now so are we. Thanks, Hugo. I /knew/ there had to be a good explanation, as what you were saying just didn't

Re: problem after using btrfs-convert

2015-12-22 Thread Duncan
s on one of the archives, then post back with any further questions you have. Here's a nice simple link to either bookmark or memorize. =:^) https://btrfs.wiki.kernel.org -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use th

Re: btrfs check inconsistency with raid1, part 1

2015-12-22 Thread Duncan
7;t match. (D should in practice be "good enough" if one was only mounted writable a very short time, while the other was written to over a rather longer period, such that it almost certainly had far more intervening commits and thus generations than the other.) -- Duncan - List

Re: Ideas to do custom operation just after mount?

2015-12-22 Thread Duncan
the previous mount-blocker experience I was a rather nervous when I saw it enabled without me initially enabling it, but space_cache has basically "just worked" for me since then, tho I've had a few other mount-blocking bugs.) -- Duncan - List replies preferred. No HTML msgs. &q

Re: dear developers, can we have notdatacow + checksumming, plz?

2015-12-22 Thread Duncan
likely trigger it, if other files have been written in parallel or in the mean time. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send

Re: defrag vs autodefrag

2015-12-20 Thread Duncan
VM images over to a fresh btrfs, mounted with autodefrag from the get-go, so they start unfragmented and you don't have that huge initial hit to take before things calm down. (That's what I've done with all my btrfs here, mounted with autodefrag from the very first mount. Tho my us

Re: Fwd: Re: Bug#808265: e2fsprogs: support btrfs compression in filefrag

2015-12-20 Thread Duncan
and understanding of the subject. (I had tried to make sense of filefrag -v and couldn't, here. After reading your relay of Ted's reply, the output makes /much/ better sense to me! =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master --

Re: Disk quota exceeded

2015-12-20 Thread Duncan
n the dir and take care to either create new files (as you did) or copy/move them into place without reflinking, so they're actually created before they have any content, so the nocow inherited from the dir will actually take effect. -- Duncan - List replies preferred. No HTML msgs. "

Re: [auto-]defrag, nodatacow - general suggestions?(was: btrfs: poor performance on deleting many large files?)

2015-12-16 Thread Duncan
Christoph Anton Mitterer posted on Wed, 16 Dec 2015 22:59:01 +0100 as excerpted: >> It's certainly in quite a few on-list posts over the years > okay,.. in other words: no ;-) > scatter over the years list posts don't count as documentation :P =:^) -- Duncan - List r

Re: [auto-]defrag, nodatacow - general suggestions?(was: btrfs: poor performance on deleting many large files?)

2015-12-16 Thread Duncan
tents or not, as I said this is my first time trying -v, and I didn't bother going that far with it.) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe

Re: [auto-]defrag, nodatacow - general suggestions?(was: btrfs: poor performance on deleting many large files?)

2015-12-16 Thread Duncan
l snapshots respectively other reflinks > would simply also change to being compressed, You're correct. I "obviously didn't thing thru" that the whole way, myself. =:^( But meanwhile, we don't have snapshot-aware-defrag, and in that case, the implication... and h

Re: [auto-]defrag, nodatacow - general suggestions?(was: btrfs: poor performance on deleting many large files?)

2015-12-16 Thread Duncan
that great. But based on real reports posting before and after numbers from filefrag (on uncompressed btrfs), we do have cases where defrag can't find 256 KiB free-space blocks and thus can actually fragment a file worse than it was before, so free-space fragmentation is indeed a very real pr

Re: [auto-]defrag, nodatacow - general suggestions?(was: btrfs: poor performance on deleting many large files?)

2015-12-16 Thread Duncan
, yet another successor filesystem may indeed be in the early stages of development, say at the 20/80 point, 20% of required effort invested, possibly 80% of the features done, but not stabilized. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a l

Re: [auto-]defrag, nodatacow - general suggestions?(was: btrfs: poor performance on deleting many large files?)

2015-12-16 Thread Duncan
Christoph Anton Mitterer posted on Wed, 16 Dec 2015 22:59:01 +0100 as excerpted: > On Wed, 2015-12-09 at 16:36 +0000, Duncan wrote: >> But... as I've pointed out in other replies, in many cases including >> this specific one (bittorrent), applications have already had to

Re: attacking btrfs filesystems via UUID collisions?

2015-12-16 Thread Duncan
ey just do it... and sometimes they suffer the consequences when they do... and sometimes then try to blame others for it.That's the way of the world; not something we're going to change. Even the required actually spelled out "yes" confirmation, not just "y"

Re: attacking btrfs filesystems via UUID collisions?

2015-12-16 Thread Duncan
e, as we know it, so I'm far from alone, there. But, despite the debatable human-readability, it's a h*** of a lot more readable than UUIDs, and works very well indeed in LABEL= usage in fstab, being a h*** of a lot easier to work with there than UUIDs! =:^) -- Duncan - List replies prefe

Re: [PATCH v3] btrfs: Introduce new mount option to disable tree log replay

2015-12-16 Thread Duncan
Christoph Anton Mitterer posted on Wed, 16 Dec 2015 12:45:00 +0100 as excerpted: > On Wed, 2015-12-16 at 11:10 +0000, Duncan wrote: >> And noload doesn't have the namespace collision problem norecovery does >> on btrfs, so I'd strongly suggest using it, at least as an al

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