Re: ZFS boot on zfs mirror
Hi, i prefere use zfsboot boot sector, an example is better than a long talk: $ zpool create tank mirror ad4 ad6 $ zpool export tank $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1 $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1 $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024 $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024 $ zpool import tank $ zpool set bootfs=tank tank $ zfs set mountpoint=legacy tank add vfs.root.mountfrom=zfs:tank to your loader.conf now you can boot on ad4 or ad6 Source: http://www.waishi.jp/~yosimoto/diary/?date=20080909 2009/5/25 Philipp Wuensche cryx-free...@h3q.com: Lorenzo Perone wrote: Hello to all, Having licked blood now, and read the news from Kip Macy about - zfs boot for all types now works I was wondering if anyone has some updated tutorial on how to achieve a zfs-only bootable FreeBSD with a mirrored zpool. My own howto and script to do the stuff automated: http://outpost.h3q.com/patches/manageBE/create-FreeBSD-ZFS-bootfs.txt But beware, it is meant to use with http://anonsvn.h3q.com/projects/freebsd-patches/wiki/manageBE afterwards. But the steps are the same. Searching around I found this tutorial on how to set up a ZFS bootable system, which is mostly straightforward: http://blogs.freebsdish.org/lulf/2008/12/16/setting-up-a-zfs-only-system/ However it leaves a few questions open... How am I supposed to make a zfs mirror out of it? Suppose I have ad4 and ad6, should I repeat the exact same gpart-steps for both ad4 and ad6, and then make a zpool create data mirror ad4p3 ad6p3? Exactly. How about swap? I suppose it will be on one of the disks? I keep swap in a seperate partition. You could either use two swap partition, each on one disk or use gmirror to mirror a single swap partition to be safe from disk crash. And what if I start with one disk and add the second one later with zpool attach? This will work. Just do the same gpart commands on the second disk and use zpool attach. greetings, philipp ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
On Tue, 26 May 2009, Mickael MAILLOT wrote: MM Hi, MM MM i prefere use zfsboot boot sector, an example is better than a long talk: MM MM $ zpool create tank mirror ad4 ad6 MM $ zpool export tank MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024 s/skeep/skip/ ? ;-) MM $ zpool import tank MM $ zpool set bootfs=tank tank MM $ zfs set mountpoint=legacy tank MM MM add vfs.root.mountfrom=zfs:tank to your loader.conf MM now you can boot on ad4 or ad6 MM MM Source: MM http://www.waishi.jp/~yosimoto/diary/?date=20080909 [snip] -- Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: ma...@freebsd.org ] *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- ma...@rinet.ru *** ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
Hi All, Thanx for all the feedback! Philipp: Your idea is really fine, with manageBE :) Would surely be nice for a test/development machine, I'll think about using it... (sounds a bit like FreeBSD goin' the Nexenta way...) Mickael: Your example looks much more like what I was looking for (and thank god UNIX still is mostly ASCII so I can follow the link You posted). But, just as a side question: how much of a risk of creating an [ugly] race condition is it actually, to use swap on a zvol? Yet another question would be, how much is performance impacted by the zfs overhead (ok, leaving aside that a swapping system needs ram - wherever the swap is located...)? But hey, snapshotting swap - isn't THAT funky? ;) Thanx to all for the feedback, it's great to be a FreeBSD user all the time! I'll be trying to set this up ASAP. Regards, Lorenzo On 26.05.2009, at 11:26, Mickael MAILLOT wrote: Hi, i prefere use zfsboot boot sector, an example is better than a long talk: $ zpool create tank mirror ad4 ad6 $ zpool export tank $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1 $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1 $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024 $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024 $ zpool import tank $ zpool set bootfs=tank tank $ zfs set mountpoint=legacy tank add vfs.root.mountfrom=zfs:tank to your loader.conf now you can boot on ad4 or ad6 Source: http://www.waishi.jp/~yosimoto/diary/?date=20080909 2009/5/25 Philipp Wuensche cryx-free...@h3q.com: Lorenzo Perone wrote: Hello to all, Having licked blood now, and read the news from Kip Macy about - zfs boot for all types now works I was wondering if anyone has some updated tutorial on how to achieve a zfs-only bootable FreeBSD with a mirrored zpool. My own howto and script to do the stuff automated: http://outpost.h3q.com/patches/manageBE/create-FreeBSD-ZFS-bootfs.txt But beware, it is meant to use with http://anonsvn.h3q.com/projects/freebsd-patches/wiki/manageBE afterwards. But the steps are the same. Searching around I found this tutorial on how to set up a ZFS bootable system, which is mostly straightforward: http://blogs.freebsdish.org/lulf/2008/12/16/setting-up-a-zfs-only-system/ However it leaves a few questions open... How am I supposed to make a zfs mirror out of it? Suppose I have ad4 and ad6, should I repeat the exact same gpart-steps for both ad4 and ad6, and then make a zpool create data mirror ad4p3 ad6p3? Exactly. How about swap? I suppose it will be on one of the disks? I keep swap in a seperate partition. You could either use two swap partition, each on one disk or use gmirror to mirror a single swap partition to be safe from disk crash. And what if I start with one disk and add the second one later with zpool attach? This will work. Just do the same gpart commands on the second disk and use zpool attach. greetings, philipp ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
Dmitry Morozovsky writes: On Tue, 26 May 2009, Mickael MAILLOT wrote: MM Hi, MM MM i prefere use zfsboot boot sector, an example is better than a long talk: MM MM $ zpool create tank mirror ad4 ad6 MM $ zpool export tank MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024 s/skeep/skip/ ? ;-) What is the reason for copying zfsboot one bit at a time, as opposed to dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=2 g. ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
on 26/05/2009 19:21 George Hartzell said the following: Dmitry Morozovsky writes: On Tue, 26 May 2009, Mickael MAILLOT wrote: MM Hi, MM MM i prefere use zfsboot boot sector, an example is better than a long talk: MM MM $ zpool create tank mirror ad4 ad6 MM $ zpool export tank MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024 s/skeep/skip/ ? ;-) What is the reason for copying zfsboot one bit at a time, as opposed to dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=2 seek=1024 for the second part? and no 'count=1' for it? :-) [Just guessing] Apparently the first block of zfsboot is some form of MBR and the rest is zfs-specific code that goes to magical sector 1024. -- Andriy Gapon ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
Andriy Gapon writes: on 26/05/2009 19:21 George Hartzell said the following: Dmitry Morozovsky writes: On Tue, 26 May 2009, Mickael MAILLOT wrote: MM Hi, MM MM i prefere use zfsboot boot sector, an example is better than a long talk: MM MM $ zpool create tank mirror ad4 ad6 MM $ zpool export tank MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1 MM $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024 MM $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024 s/skeep/skip/ ? ;-) What is the reason for copying zfsboot one bit at a time, as opposed to dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=2 seek=1024 for the second part? and no 'count=1' for it? :-) [Just guessing] Apparently the first block of zfsboot is some form of MBR and the rest is zfs-specific code that goes to magical sector 1024. Ok, I managed to read the argument to seek as one block, apparently my coffee hasn't hit yet. I'm still confused about the two parts of zfsboot and what's magical about seeking to 1024. g. ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
on 26/05/2009 19:42 George Hartzell said the following: I'm still confused about the two parts of zfsboot and what's magical about seeking to 1024. Can't help with answer to this, but cc-ing the one who can (I think). I am interested too :-) -- Andriy Gapon ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
On Tue, 26 May 2009 19:57:03 +0300, Andriy Gapon a...@icyb.net.ua wrote: on 26/05/2009 19:42 George Hartzell said the following: I'm still confused about the two parts of zfsboot and what's magical about seeking to 1024. Can't help with answer to this, but cc-ing the one who can (I think). I am interested too :-) This is due to the primitive DOS boot sequence. Basically the BIOS loads the first sector of the partition and executes it. For zfsboot, that is the first 512 bytes of /boot/zfsboot. The next stage of the bootstrap is tucked away in a convenient hole in the ZFS on-disk formwat which is located just after the ZFS metadata - this is the seek=1024 part. The first 512 byte part is a tiny assembler program that loads the rest into memory and executes it. The second part is large enough and smart enough to understand the ZFS filesystem format directly and it loads /boot/loader directly from the filesystem and transfers control to that. The third stage (/boot/loader) is what puts up the boot menu and loads the kernel etc. ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
Re: ZFS boot on zfs mirror
Lorenzo Perone wrote: Hello to all, Having licked blood now, and read the news from Kip Macy about - zfs boot for all types now works I was wondering if anyone has some updated tutorial on how to achieve a zfs-only bootable FreeBSD with a mirrored zpool. My own howto and script to do the stuff automated: http://outpost.h3q.com/patches/manageBE/create-FreeBSD-ZFS-bootfs.txt But beware, it is meant to use with http://anonsvn.h3q.com/projects/freebsd-patches/wiki/manageBE afterwards. But the steps are the same. Searching around I found this tutorial on how to set up a ZFS bootable system, which is mostly straightforward: http://blogs.freebsdish.org/lulf/2008/12/16/setting-up-a-zfs-only-system/ However it leaves a few questions open... How am I supposed to make a zfs mirror out of it? Suppose I have ad4 and ad6, should I repeat the exact same gpart-steps for both ad4 and ad6, and then make a zpool create data mirror ad4p3 ad6p3? Exactly. How about swap? I suppose it will be on one of the disks? I keep swap in a seperate partition. You could either use two swap partition, each on one disk or use gmirror to mirror a single swap partition to be safe from disk crash. And what if I start with one disk and add the second one later with zpool attach? This will work. Just do the same gpart commands on the second disk and use zpool attach. greetings, philipp ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org
