Date: Mon, 04 Jun 2012 21:41:15 +0100 From: Kaya Saman <kayasaman@gmail.com> To: Matthew Seaman <matthew@FreeBSD.org> Cc: freebsd-fs@FreeBSD.org Subject: Re: Using ZFS as RAID0 - disk offline question Message-ID: <4FCD1D6B.9030901@gmail.com> In-Reply-To: <4FCD1CD4.5080406@FreeBSD.org> References: <4FCD13CF.3010406@gmail.com> <4FCD17C6.5020503@FreeBSD.org> <4FCD19E6.1010802@gmail.com> <4FCD1CD4.5080406@FreeBSD.org>
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On 06/04/2012 09:38 PM, Matthew Seaman wrote: > On 04/06/2012 21:26, Kaya Saman wrote: >> You see if say a system board fails and both devices are named /dev/ad4 >> and /dev/ad5 then a new system board gets put in and the device names >> changed to /dev/ad12 and /dev/ad13 my question is will the ZPOOL still >> exist? Will ZFS be intelligent enough to pick up the new device names >> via the disk ID's? > Yes, this should work just fine. ZFS labels each disk with its own UUID > value, so you can pretty much shuffle the disks in any order across all > available disk slots, and ZFS will be able to put the zpool back together. > >> Additionally if /dev/ad5 goes down, is it possible to keep using >> /dev/ad4 which is part of the 'downed' pool...?? Or would one need to >> replace the disk ad5 then the pool comes up again with only the >> information on ad4?? > No. A RAID0 zpool will be marked offline if any of the drives within it > fails. You might be able to recover some data from remaining drives, > but not easily. The surest way of getting anything back would be to go > to a specialist disaster recovery company, but expect to pay $$$ for it. > Considering the price of hard drives nowadays, this would be a dumb > choice: you could easily convert your RAID0 to a RAID10 for much less > than it would cost you to try and recover from a broken RAID0. > > Even if you do install a replacement disk, ZFS won't be able to rebuild > from your original drive. You'ld have to wipe and rebuild from scratch. > > Cheers, > > Matthew > Many thanks! They were exactly the answers I was looking for :-) Apologies for my inexperience in this matter! Regards, Kaya
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