Date: Tue, 26 May 2009 14:20:28 +0200 From: Lorenzo Perone <lopez.on.the.lists@yellowspace.net> To: Mickael MAILLOT <mickael.maillot@gmail.com> Cc: Philipp Wuensche <cryx-freebsd@h3q.com>, FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: ZFS boot on zfs mirror Message-ID: <2B000656-62C3-4066-BBA5-9D4346FF12EE@yellowspace.net> In-Reply-To: <ea7b7b810905260226g29e8cbf5ic75a59b979f6cd42@mail.gmail.com> References: <29579856-69F7-4CDC-A52A-B414A40180ED@yellowspace.net> <4A1B0B4F.1020106@h3q.com> <ea7b7b810905260226g29e8cbf5ic75a59b979f6cd42@mail.gmail.com>
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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-freebsd@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-unsubscribe@freebsd.org >> " >> > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org > "
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