Date: Mon, 16 Aug 2010 09:05:05 +1000 From: David Rawling <djr@pdconsec.net> To: freebsd-questions@freebsd.org Subject: Re: ZFS Question Message-ID: <4C6872A1.70703@pdconsec.net> In-Reply-To: <4C68708A.905@gmail.com> References: <4C68708A.905@gmail.com>
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On 16/08/2010 8:56 AM, Depo Catcher wrote: > Hi, I'm building a new file server. Right now I'm on FreeBSD 6.4/UFS2 and > going to go to 8.1 with ZFS. > > Right now I have 3 disks, but one of them has data on it. I'd like to setup > a RaidZ but have a question on how to do this: > Basically, I need to setup a mirror with the two empty drives, copy the data > over and then add the third. Is that even possible? That kind of expansion cannot be done with FreeBSD ZFS (yet - I believe it was being worked on in OpenSolaris and it would have filtered to FreeBSD). Once the pool uses a given RAID level, I believe that's set in stone. What might work is this - paraphrased because I'm not 100% sure of the specific commands: * Create a large (multiple GB) file on your existing disk - let's assume that's /disk1/file0 (dd if=/dev/zero of=/disk1/file0 bs=1024 count=104857600 would be 100GB) * Create a 3 disk RAIDZ1 pool using /dev/disk2, /dev/disk3 and /disk1/file0 (zpool create tank raidz1 ...) * Delete the file (the pool will be degraded) * Copy data to the degraded pool * Replace the missing disk file with /dev/disk1 (zpool replace?) * Scrub the pool for consistency checks (then reset the counters so you can track the current state. You'll want a backup just in case, though, so is there perhaps a case for getting 1 more disk and building the set clean? That way the old disk becomes a backup. Dave. -- David Rawling PD Consulting And Security Mob: +61 412 135 513 Email: djr@pdconsec.net
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