Re: Opps.. Should be 4.9/4.10 Experiences

2017-02-17 Thread Duncan
10 issues, but they're amdgpu, not btrfs related. (Unfortunately, between working long hours and being sick partly as a result, I've had little time to report them, but booting with amdgpu.dpm=0 has let me continue running 4.10-git, tho I don't know exactly why if I'm not going

Re: stat(2) returning device ID not existing in mountinfo

2017-02-17 Thread Duncan
y > machine find took an huge quantity of memory (up to 3GB) when used by > updatedb. FWIW, I saw it (via news.gmane.org list2news service) here. It's well over my head, tho, so I didn't reply, but I found it interesting. -- Duncan - List replies preferred. No HTML msgs. &qu

Re: Is it possible to have metadata-only device with no data?

2017-02-05 Thread Duncan
even predict, at this point. But I do know all about waiting, by now. I've learned, and am continuing to learn, all about patience! =:^] -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your m

Re: Very slow balance / btrfs-transaction

2017-02-04 Thread Duncan
;s going to take awhile, and you'll be much happier with btrfs in the mean time if you don't have them enabled. -- 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

Re: btrfs_drop_snapshot "IO failure" after RAID controller reset

2017-02-04 Thread Duncan
that may be inappropriate to your needs. They just don't seem to be a particularly good match, at least for the general case. That isn't to say it's the /wrong/ choice for your particular use-case, but it's worth considering a reevaluation to be sure, if you haven't

Re: raid1: cannot add disk to replace faulty because can only mount fs as read-only.

2017-02-03 Thread Duncan
Austin S. Hemmelgarn posted on Thu, 02 Feb 2017 07:49:50 -0500 as excerpted: > I think (although I'm not sure about it) that this: > http://www.spinics.net/lists/linux-btrfs/msg47283.html is the first > posting of the patch series. Yes. That looks like it. Thanks. -- Duncan

Re: btrfs receive leaves new subvolume modifiable during operation

2017-02-03 Thread Duncan
Graham Cobb posted on Thu, 02 Feb 2017 10:52:26 + as excerpted: > On 02/02/17 00:02, Duncan wrote: >> If it's a workaround, then many of the Linux procedures we as admins >> and users use every day are equally workarounds. Setting 007 perms on >> a dir that doesn&#

Re: btrfs receive leaves new subvolume modifiable during operation

2017-02-01 Thread Duncan
making the same assumptions that everyone else does, that an admin knows what they are doing and sets the upstream permissions with that in mind. If they don't, how is that btrfs' fault? -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a

Re: raid1: cannot add disk to replace faulty because can only mount fs as read-only.

2017-02-01 Thread Duncan
Adam Borowski posted on Wed, 01 Feb 2017 12:55:30 +0100 as excerpted: > On Wed, Feb 01, 2017 at 05:23:16AM +0000, Duncan wrote: >> Hans Deragon posted on Tue, 31 Jan 2017 21:51:22 -0500 as excerpted: >> > But the current scenario makes it difficult for me to put redundancy >

Re: btrfs receive leaves new subvolume modifiable during operation

2017-02-01 Thread Duncan
7;t have enter access to the parent, you can't read/write the child, thus no need for btrfs-receive specific permission-hoop-jumping. (And of course SELinux or similar could be used to tighten permissions even further, should that be justified by the use-case.) -- Duncan - List replies pref

Re: raid1: cannot add disk to replace faulty because can only mount fs as read-only.

2017-01-31 Thread Duncan
trivial value by the inaction of not having that backup while running a filesystem known to be still stabilizing, didn't you? Otherwise, run a filesystem more appropriately stable and mature according to your needs, as btrfs in its current state apparently doesn't meet those needs.

Re: btrfs receive leaves new subvolume modifiable during operation

2017-01-31 Thread Duncan
ation as a result. This sort of additional sync guarantees may be in the final generally considered stabilized product, but that's yet some time (years) away. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the

Re: btrfs recovery

2017-01-31 Thread Duncan
ormal path. IOW, it should be a great help to users that don't know btrfs command or filesystem internals very well, and/or who don't find regex use particularly easy. IOW, it'd be an excellent tool to either include in btrfs-tools as-is or C-codify and add as a btrfs subcomman

Re: btrfs recovery

2017-01-30 Thread Duncan
. Or at least it's supposed to. I've never actually used it, tho I have examined the script out of curiosity to see what it did and how, and it / looks/ like it should work. I've kept that trick (and knowledge of where to look for the script) filed away in the back of my head in

Re: btrfs recovery

2017-01-30 Thread Duncan
fs / didn't, because the xfs, while potentially damaged a bit, didn't suffer the abuse of writes to the wrong device that btrfs may well have suffered, due to the non-uniqueness of the supposedly universally unique IDs and the very confused btrfs that may well have caused. -- Duncan

Re: File system is oddly full after kernel upgrade, balance doesn't help

2017-01-30 Thread Duncan
other device, selectable via BIOS if necessary, means I may just go ahead and leave my / boots at 256 MiB each anyway, and just set them both to single mode for the mixed data/metadata, to make use of the full 256 MiB and not have to worry about /boot size constraints like I do now with only 128 Mi

Re: File system is oddly full after kernel upgrade, balance doesn't help

2017-01-27 Thread Duncan
, thereby immediately upping apparent usage. That might explain that initial jump in usage after the resize. But that's just a WAG. Without at least btrfs filesystem usage, or btrfs filesystem df plus btrfs filesystem show, from before the resize, after, and before and after the balances,

Re: btrfs recovery

2017-01-27 Thread Duncan
retical, so nothing serious, but now that it's no longer theory only, it'd still be useful to be able to save the current version, if it's not /too/ much trouble" type situations, myself. =:^) Just don't count on restore to save your *** and always treat what it can o

Re: btrfs rescue chunk-recover segfaults

2017-01-24 Thread Duncan
was effectively sacrificial data, known to be potentially eaten by the testing itself. -- 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 li

Re: btrfs recovery

2017-01-20 Thread Duncan
he code, as a practical matter it's probably simply easier to restore from that backup if you valued the data enough to have one, or simply scrap the filesystem and start over if you considered the data worth less than the time and hassle of a backup, and thus didn't have one. -- Duncan -

Re: Raid 1 recovery

2017-01-18 Thread Duncan
ill shipping instead. And I'm asking in ordered to try to remedy that. =:^) -- 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 the lin

Re: [ISSUE] uncorrectable errors on Raid1

2017-01-16 Thread Duncan
hat ancient a long-term-supported enterprise distro and kernel, presumably you value stability very highly, which would seem at its root to be incompatible with btrfs' status as still in development and stabilizing, not yet fully stable and mature. So a reevaluation is likely in order,

Re: mkfs.btrfs/balance small-btrfs chunk size RFC

2017-01-11 Thread Duncan
st saved me the trouble (tho I do need to freshen my backup /boot one of these days, likely testing mkfs.btrfs on this in the process, but that can wait until 4.10). -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program,

Re: mkfs.btrfs/balance small-btrfs chunk size RFC

2017-01-11 Thread Duncan
indirectly related to the required size of the system chunk(s), in ordered to contain the chunk tree supporting all the other chunks, necessary due not to live data, but due to the snapshots. Is that a correct read, or is (somehow) that indirect dependency not there either, despite the system ch

mkfs.btrfs/balance small-btrfs chunk size RFC

2017-01-09 Thread Duncan
esent, or at least was around 4.8 time, as I believe that's about when I created the btrfs), be tested and make it into released code within say five kernel cycles, a year's time? Obviously I'm hoping so. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every

Re: BUG at mount time on v4.8.10

2017-01-06 Thread Duncan
t work so well, but then, as I suggested above, if you actually need quotas, you're best served by using a filesystem where they're actually stable and work as intended, as well, so in that case, after your backups are freshened you'll probably be doing a mkfs to some other files

Re: kernel crash after upgrading to 4.9

2017-01-05 Thread Duncan
Duncan posted on Thu, 05 Jan 2017 09:23:35 + as excerpted: > In his case the copying was from 7.2krpm to 5.6krpm drives, but not the > reverse or when copying from slower to faster. Ugh. What I /meant/ was: Slower to faster: worked Between same speeds:worked Faster to

Re: kernel crash after upgrading to 4.9

2017-01-05 Thread Duncan
sctl config. Look in /etc/sysctl.d/* and/or /etc/sysctl.conf, as appropriate to your distro. [3] Approaches: The memory figure used for calculating this percentage excludes some things so it won't actually reach 10% of total memory. But the exclusions are small enough that they can be

Re: mounting failed any file on my filesystem

2016-12-30 Thread Duncan
tarting over again, as there's a real question as to whether it can even be properly fixed, tho I'm not sure it will come to that. -- 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: Can't add/replace a device on degraded filesystem

2016-12-30 Thread Duncan
counting on that, I'll have a problem that restore can't fix, so I really do consider those backups a measure of the value I place on the data, and would be stressed to a point, but only to a point, if I ended up losing any changes between my sometimes too stale backups, and my

Re: mounting failed any file on my filesystem

2016-12-29 Thread Duncan
btrfs is the right filesystem choice for you, because it /isn't/ yet fully stable and mature, and chances are you'd be better off with a more stable and mature filesystem where not having updated at-hand backups is less of a risk (altho as I said any sysadmin worth the name will tel

Re: some free space cache corruptions

2016-12-28 Thread Duncan
Christoph Anton Mitterer posted on Thu, 29 Dec 2016 04:43:35 +0100 as excerpted: > On Mon, 2016-12-26 at 00:12 +0000, Duncan wrote: >> By themselves, free-space cache warnings are minor and not a serious >> issue at all -- the cache is just that, a cache, designed to speed >&

Re: [CORRUPTION FILESYSTEM] Corrupted and unrecoverable file system during the snapshot receive

2016-12-25 Thread Duncan
is triggered that would likewise show up in other situations with a similar amount of data/metadata written), there should be no effects outside that received subvolume. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the

Re: some free space cache corruptions

2016-12-25 Thread Duncan
edia corruption, blocks not matching their checksum, while check deals with filesystem logic errors, whether or not the blocks containing them match the checksum. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program,

Re: [CORRUPTION FILESYSTEM] Corrupted and unrecoverable file system during the snapshot receive

2016-12-25 Thread Duncan
avior isn't really a factor at the btrfs level as that's the transfer layer and btrfs isn't worrying about that, simply assuming it to have the necessary reliability. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use

Re: [BUG] kernel BUG at fs/btrfs/extent_io.c:2041 repair_io_failure (v4.8.11)

2016-12-24 Thread Duncan
off and rewrite at least the boot- critical stuff to decompress it, so as not to be affected. -- 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 fro

Re: [bug or by design ?] btrfs defrag compression does not persist

2016-12-22 Thread Duncan
ated out of active use and are no longer being actively rewritten/appended. They don't /want/ further modifications compressed to the same level in real- time. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the progr

Re: btrfs_log2phys: cannot lookup extent mapping

2016-12-22 Thread Duncan
it more time trying to save it, successfully in my case, once I knew I was actually in the recovery or loss situation. Tho in your case it looks like you are looking at the warnings before it gets to that point, and it's both a backup already, so you presumably have the live data in most c

Re: btrfs_log2phys: cannot lookup extent mapping

2016-12-20 Thread Duncan
that's beyond me. So while it's quite possible someone else will recognize a specific bug and be able to point you toward a specific fix, tho honestly I don't expect it for something as old as what you're posting about, general list-recommended upgrades and alternatives f

Re: *** Some devices missing ***

2016-12-07 Thread Duncan
btrfs ignore the given number if all chunks (both copies in raid1/10 mode) appear to be accounted for on already available devices. I believe the patch has been queued, but isn't in a release yet. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lo

Re: Metadata balance fails ENOSPC

2016-12-05 Thread Duncan
Stefan Priebe - Profihost AG posted on Mon, 05 Dec 2016 12:12:12 +0100 as excerpted: > isn't there a way to move free space to unallocated space again? Yes, btrfs balance, but... -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- a

Re: btrfs fi du is unreliable

2016-12-04 Thread Duncan
isn't showing any shared, since it's mounted with compress=lzo as well. -- 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 l

Re: system hangs due to qgroups

2016-12-04 Thread Duncan
Marc Joliet posted on Sun, 04 Dec 2016 20:20:51 +0100 as excerpted: > On Sunday 04 December 2016 18:24:08 Duncan wrote: >> Marc Joliet posted on Sun, 04 Dec 2016 17:02:48 +0100 as excerpted: >> > [After trying it] >> > >> > Well, crap, I was able t

Re: system hangs due to qgroups

2016-12-04 Thread Duncan
rfs. It may be possible to make btrfs a bit safer in terms of refusing to mount and/or going read-only if new devices with the same UUIDs appear in ordered to avoid corruption, but the basic UUID uniqueness assumption itself is apparently buried deeply enough in btrfs that it's not goin

Re: missing checksums on reboot

2016-12-02 Thread Duncan
I might suggest you start by testing it. If it fixes the problem for you, then you can decide whether to try to push it as an upgrade, or try to bisect the problem further in ordered to properly backport the fix. If it doesn't, of course the 4.1 and 4.4 LTS kernels are other major test po

Re: [PATCH] btrfs-progs: doc: Update docs about RAID profiles

2016-12-01 Thread Duncan
his particular aspect of documentation. > > Documentation/mkfs.btrfs.asciidoc | 44 > --- > 1 file changed, 36 insertions(+), 8 deletions(-) FWIW, LGTM as a btrfs user and list regular. Thanks. =:^) -- Duncan - List replies preferred. No HTML msgs. "E

Re: Metadata balance fails ENOSPC

2016-12-01 Thread Duncan
chunks as necessary to free up some of that allocated but unused data and metadata space. Then once a suitable amount of space has been freed, btrfs device remove the temporary device once again, thus triggering balance to write everything from it back to the original device once again. Which i

Re: Convert from RAID 5 to 10

2016-11-30 Thread Duncan
t's of no particular value to them anyway, well then, no such preliminary research and testing is required. Indeed, it would be stupid, because they surely have more important and higher priority things to deal with.) -- Duncan - List replies preferred. No HTML msgs. "Every nonf

Re: Convert from RAID 5 to 10

2016-11-30 Thread Duncan
's purely due to people not understanding the status of btrfs in general, and that if there's a general deficiency at all, it's in the lack of a general stability status paragraph on that page itself explaining all this, despite the fact that the main https:// btrfs.wik

Re: True size of btrfs data chunk

2016-11-29 Thread Duncan
ikis I could in theory edit, as read-only, even if the alternative is replying repeatedly to list threads such as this, vs. a single wiki edit. [shrug] -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your mast

Re: [Not TLS] Re: mount option nodatacow for VMs on SSD?

2016-11-28 Thread Duncan
Graham Cobb posted on Mon, 28 Nov 2016 09:49:33 + as excerpted: > On 28/11/16 02:56, Duncan wrote: >> It should still be worth turning on autodefrag on an existing somewhat >> fragmented filesystem. It just might take some time to defrag files >> you do modify, and

Re: mount option nodatacow for VMs on SSD?

2016-11-28 Thread Duncan
assumes COW by default and many of its features depend on COW -- that's why these features don't tend to be implemented on conventional rewrite-in-place filesystems in the first place. Both checksumming and compression are among these COW-dependent features. -- Duncan - List replies pref

Re: mount option nodatacow for VMs on SSD?

2016-11-27 Thread Duncan
were some worries about performance in some circumstances, and the option was experimental back then, so it made /sense/ not to have it the default. But that was then and this is now, and IMO it should be the default, now. Maybe it will be at some point? But one of the btrfs devs has to care

Re: mount option nodatacow for VMs on SSD?

2016-11-25 Thread Duncan
x27;t enough on its own to handle it. Bottom line, the fragmentation is much less of a problem on ssds, particularly with autodefrag which may well be enough, but as always, it can be installation and task dependent, so if it's going to be a production system, do your own testing and make y

Re: Inconsistent free space with false ENOSPC

2016-11-23 Thread Duncan
Martin Raiber posted on Wed, 23 Nov 2016 16:22:29 + as excerpted: > On 23.11.2016 07:09 Duncan wrote: >> Yes, you're in a *serious* metadata bind. >> Any time global reserve has anything above zero usage, it means the >> filesystem is in dire straits, and wel

Re: Inconsistent free space with false ENOSPC

2016-11-22 Thread Duncan
ent files elsewhere, delete the existing copy, and copy/move them back into place, thus releasing the old extent references and freeing the space those old extents took. Of course depending on the circumstances and how your backups are handled (noting your urbackup.org email address here), it may

Re: Snapper & apt-btrfs-snapshot on Ubuntu

2016-11-01 Thread Duncan
btrfs quotas, so being proactive and turning them off if you don't need them, to avoid having the issues in the first place, certainly can't hurt. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is y

Re: Replace missing drive in RAID56 BTRFS without mounting.

2016-10-25 Thread Duncan
said, Chris Murphy or someone else with experience at trying to recover raid56 should be along with more detail, if you'd still prefer to go to that extra effort regardless of the real chance it won't help, in case it can. -- Duncan - List replies preferred. No HTML msgs. &quo

Re: speed up cp --reflink=always

2016-10-17 Thread Duncan
hardcoded to 128k for compression. Isn't it? I flagged that as I read it, too, but... 200 KB extents average suggests it can't be compressed, because if it were they'd be 128 KB extents, not 200 KB. That's a difference of over half a million extents (128 KB would be ~1.5565 mi

Re: RAID system with adaption to changed number of disks

2016-10-14 Thread Duncan
tence for a short sig, full paragraph for a longer one. -- 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 the line "unsubscribe linu

Re: Incremental send robustness question

2016-10-13 Thread Duncan
r the initial setup, or explaining why the idea won't work, but at this point based on my own understanding, it seems like it should be perfectly workable to me. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the p

Re: Unable to rescue RAID5

2016-10-13 Thread Duncan
and patience, and likely a significant level of technical understanding along with some help from btrfs experts that know more about the btrfs raid56 technical details than I do. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if yo

Re: Resize a btrfs File System : no enough free space... why ?!?

2016-10-01 Thread Duncan
een reported to do it for others running into ENOSPC issues. =:^) -- 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 the line "unsu

Re: unable to handle kernel paging request - btrfs

2016-09-25 Thread Duncan
Rich Freeman posted on Sun, 25 Sep 2016 09:55:42 -0400 as excerpted: > On Fri, Sep 23, 2016 at 12:58 AM, Duncan <1i5t5.dun...@cox.net> wrote: >> >> Btrfs raid1 you say, and you have existing compressed files it's trying >> to read in the backtrace? >> >>

Re: Does data checksumming remain for files with No_COW file attribute?

2016-09-24 Thread Duncan
ins valid. The other alternative, of course, is to avoid snapshotting your NOCOW files (which of course means losing send/receive, since send requires a read-only snapshot). You can choose one or the other, but can't have both without one, NOCOW, yielding to the other. -- Duncan - List re

Re: unable to handle kernel paging request - btrfs

2016-09-22 Thread Duncan
the kernel should do dynamically as well, but that's where the bug is as too many dynamic csum errors trigger a crash even when there's a second copy available, that scrub later verifies as valid. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has

Re: stability matrix (was: Is stability a joke?)

2016-09-20 Thread Duncan
there, but relatively quite small compared to on-demand per-file defrag. -- 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 the line &q

Re: Filesystem will remount read-only

2016-09-16 Thread Duncan
ons is a good part of the reason such distros exist, and a good part of why a lot of people are willing to pay sometimes rather sizable sums of money /for/ that level of support. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the

Re: df -i shows 0 inodes 0 used 0 free on 4.4.0-36-generic Ubuntu 14 - Bug or not?

2016-09-15 Thread Duncan
are running pretty much correctly, as in that case all userspace is doing in most cases is calling the kernel to do the real work anyway, it becomes a much bigger deal when something goes wrong, because it's userspace code that's executing with btrfs check or btrfs restore, and

Re: Thoughts on btrfs RAID-1 for cold storage/archive?

2016-09-15 Thread Duncan
ed raid1 (unless needed for scrub, etc), not mounting it writable, and as long as you are careful to do just that, only mount it read-only, you should be fine. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is y

Re: unable to handle kernel paging request

2016-09-15 Thread Duncan
expected/ to hit 4.8-rc, current development, first. After that, given that it's already flagged for stable, it should eventually hit all the stable kernels to which it applies as well. That can be right away, but if the stable maintainer (Greg K-H, normally) is backlogged due to just

Re: Small fs

2016-09-12 Thread Duncan
Chris Murphy posted on Mon, 12 Sep 2016 08:48:49 -0600 as excerpted: > On Sun, Sep 11, 2016 at 10:54 PM, Duncan <1i5t5.dun...@cox.net> wrote: > >> On the bright side, the double-whammy of being under such tight >> filesystem size constraints, coupled with finding out yo

Re: Mixing partitioned and non-partitioned discs in a RAID?

2016-09-12 Thread Duncan
Kai Krakow posted on Tue, 13 Sep 2016 00:21:10 +0200 as excerpted: > Am Sun, 21 Aug 2016 02:19:33 + (UTC) > schrieb Duncan <1i5t5.dun...@cox.net>: > >> Chris Murphy posted on Sat, 20 Aug 2016 18:36:21 -0600 as excerpted: >> >> > FAT leaves a lot to be

Re: Small fs

2016-09-11 Thread Duncan
lf of what the size of it suggests it should fit, IOW. And I think that argument /was/ made, to some extent. But the whole thing only came up because they found testing with small filesystems inconvenient due to the mixed-bg default, so rather than fix that by fixing the tests, they broke th

Re: compress=lzo safe to use?

2016-09-11 Thread Duncan
#x27;m correct, it probably doesn't matter what the compression type is, only how much of it there is. So compress-force would tend to trigger the issue far more frequently than simply compress, unless of course your use-case is a corner-case like my trying to read all those compressible t

Re: Small fs

2016-09-11 Thread Duncan
Imran Geriskovan posted on Sun, 11 Sep 2016 21:56:07 +0300 as excerpted: > On 9/11/16, Duncan <1i5t5.dun...@cox.net> wrote: >> Martin Steigerwald posted on Sun, 11 Sep 2016 17:32:44 +0200 as >> excerpted: >>>> What is the smallest recommended fs size for btrfs?

Re: Small fs

2016-09-11 Thread Duncan
the mixed-mode default, despite it still being extremely strongly recommended for under a GiB. -- 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 t

Re: Is stability a joke?

2016-09-11 Thread Duncan
trfs is ready for the first and can in some cases be ready for the second and the third if they have backups, it's definitely *not* "production ready" for the segment of the third that don't even have backups. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree pr

Re: Small fs

2016-09-11 Thread Duncan
e via bios) on another device, I have a 640 MiB btrfs pair-device raid1 /var/log. It's mixed-mode too, 640 MiB per device, but pair-device raid1, so I don't have to worry about the 2X data factor on a single device. All my other "system" partitions are btrfs raid1 as well

Re: btrfs kernel oops on mount

2016-09-09 Thread Duncan
less lucky but still in good shape, they'll fix the root problem but the balance already got the btrfs so wedged that you'll still have to mount with skip_balance, then cancel the balance, losing your place, and then presumably restart a new one. 3) Given the currently active enosp

Re: [OT] ccache and tmpfs builds Was: Balancing subvolume on a specific device

2016-09-06 Thread Duncan
Austin S. Hemmelgarn posted on Tue, 06 Sep 2016 08:32:02 -0400 as excerpted: > On 2016-09-02 06:55, Duncan wrote: >> Kai Krakow posted on Thu, 01 Sep 2016 21:45:19 +0200 as excerpted: >> >>> Off topic: Is ccache really that helpful? I dumped it a few years ago >>

Re: btrfs send extremely slow (almost stuck)

2016-09-05 Thread Duncan
ows...), I don't know which. And that of course assumes it's even the same basic bug and would behave as it did for me if you had no snapshots. That was with kernel 4.7.0 (which I'm still running, I'll be upgrading to 4.8 rcs pretty soon now) I believe. If not, then it w

Re: Security implications of btrfs receive?

2016-09-05 Thread Duncan
our actions as such, regardless of any words claiming the contrary. To the extent that you can trust your people as much as your backups, great, but not having those backups really /is/ defining that data as not worth the hassle, regardless of whether it's lost to malicious attack or to hardwa

Re: [OT] Re: Balancing subvolume on a specific device

2016-09-02 Thread Duncan
Kai Krakow posted on Thu, 01 Sep 2016 21:45:19 +0200 as excerpted: > Am Sat, 20 Aug 2016 06:30:11 + (UTC) > schrieb Duncan <1i5t5.dun...@cox.net>: > >> There's at least three other options to try to get what you mention, >> however. FWIW, I'm a ge

Re: btrfs and systemd

2016-08-28 Thread Duncan
ing. Of course if they break, you'll then be dealing with the longer timeouts, but you may find it easier to simply set that default and deal with the long timeouts on anything else when and if some other unit does actually break and start following the longer default timeouts. -- Duncan - L

Re: btrfstune settings

2016-08-28 Thread Duncan
less the value of the data simply isn't worth the hassle, and once you have a backup tested, available and ready to use should it be necessary, blowing the existing filesystem away and starting with a fresh filesystem created with the options you want isn't much more difficult and

Re: Crush on btrfs device delete missing

2016-08-28 Thread Duncan
filesystem df outputs. -- 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 the line "unsubscribe linux-btrfs" in the body of a

Re: btrfs send extremely slow (almost stuck)

2016-08-28 Thread Duncan
ppened to the quota code a number of times for instance, as it as turned out to be a /really/ hard problem, with multiple rewrites necessary, such that even now, the practical recommendation is often to either just turn off quotas and not worry about them if you don't need them, or use a m

Re: btrfs partition fails to mount - kernel BUG at ../fs/btrfs/extent-tree.c:1872

2016-08-24 Thread Duncan
ou run more or less normally, altho if you try to access whatever file or metadata the balance is choking on, you'd still be in trouble. And the results should pin down whether it's the balance, or something else, triggering the problem. Beyond that I'll leave for the real expert

Re: Will Btrfs have an official command to "uncow" existing files?

2016-08-21 Thread Duncan
these features are really practical due to cow in the first place, the reason other filesystems don't tend to have them, and that while there is definitely a tradeoff to cow vs. nocow, setting nocow doesn't turn off features you'd have in conventional filesystems anyway, so it's n

Re: Mixing partitioned and non-partitioned discs in a RAID?

2016-08-20 Thread Duncan
device direct from the grub2 prompt, emergency mode if it can't load the /boot off that device, if you like. -- 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 un

Re: Mixing partitioned and non-partitioned discs in a RAID?

2016-08-19 Thread Duncan
ata cabinet and the other in another, and lose the connection to everything in the one, without loss of data as raid0 on the other leg of the btrfs raid1 will still be operating. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use th

Re: Balancing subvolume on a specific device

2016-08-19 Thread Duncan
mature than btrfs and offers similar features, plus some btrfs doesn't have yet, minus a few others as it's an earlier implementation and some of the stuff learned from it was used when designing btrfs. So you might look into it and see if it meets your needs. -- Duncan - List rep

Re: Likelihood of read error, recover device failure raid10

2016-08-14 Thread Duncan
7;t random and it happens repeatedly in the degraded area, you're screwed, for whatever file or metadata covering multiple files it was in, at least. You should still be able to recover the rest of the filesystem, however. Which all goes to demonstrate once again that raid != backup, and th

Re: btrfs quota issues

2016-08-14 Thread Duncan
the number of reported extents, considering it compressed if so. For a few one-off files, that's easy enough to do manually, but you'd definitely want to automate the process if you wanted that information on more than a few individual files. -- Duncan - List replies preferred.

Re: checksum error in metadata node - best way to move root fs to new drive?

2016-08-12 Thread Duncan
various countries (China being the one most frequently named) that would pay good money for unencrypted devices from the right sources. -- 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: checksum error in metadata node - best way to move root fs to new drive?

2016-08-11 Thread Duncan
et, so for me, I'd either use something other than btrfs, or use btrfs but really emphasize the backups, including testing them of course, because I /don't/ really trust btrfs on crypted just yet. But based on earlier posts in this thread, I admit it's very possible that all the

Re: checksum error in metadata node - best way to move root fs to new drive?

2016-08-11 Thread Duncan
Chris Murphy posted on Thu, 11 Aug 2016 14:43:56 -0600 as excerpted: > On Thu, Aug 11, 2016 at 1:07 PM, Duncan <1i5t5.dun...@cox.net> wrote: >> The compression-related problem is this: Btrfs is considerably less >> tolerant of checksum-related errors on btrfs-compressed dat

Re: btrfs quota issues

2016-08-11 Thread Duncan
ventually make that feature stable and workable for all. =:^) -- 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 the line "unsubscribe l

Re: checksum error in metadata node - best way to move root fs to new drive?

2016-08-11 Thread Duncan
provably exists a second valid copy, but where this only happens with compression, should go quite far in stabilizing btrfs on encrypted underlayers. I know I certainly wouldn't object to the problem being fixed. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfre

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