Date: Mon, 30 Nov 2009 15:33:08 -0500 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: Wiktor Niesiobedzki <bsd@w.evip.pl> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZFS guidelines - preparing for future storage expansion Message-ID: <5f67a8c40911301233s46a2818at9051c4ebbacf7e25@mail.gmail.com> In-Reply-To: <2ae8edf30911300425g4026909bm9262f6abcf82ddcd@mail.gmail.com> References: <2ae8edf30911300120x627e42a9ha2cf003e847d4fbd@mail.gmail.com> <4B139AEB.8060900@jrv.org> <2ae8edf30911300425g4026909bm9262f6abcf82ddcd@mail.gmail.com>
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On Mon, Nov 30, 2009 at 7:25 AM, Wiktor Niesiobedzki <bsd@w.evip.pl> wrote: > 2009/11/30 James R. Van Artsdalen <james-freebsd-fs2@jrv.org>: > > Wiktor Niesiobedzki wrote: > >> do I need to do something more, to get new space used by > >> RAIDZ? > > > > Export the pool, the import it. Adding a vdev is done right away, but > > increasing the size of a vdev (as you did) only happens on import. > > > > That did the trick, thanks :-) Cool thing! :-) > Wasn't a reboot also an option (which might disturb active NFS mounts less)? I moved from 5x 750G to 5x 1.5T disks this way earlier this year. It takes a _long_ time. resilvering 750g (they were about 98% full when I did this) onto the 1.5T disks took about 12 hours each. With work and sleep and other distractions, it took most of a week to perform the upgrade. And keep in mind that while you're upgrading, you're vulnerable to data loss (no more replicas). I suppose RAIDZ2 would make that safer, but more costly. This form of upgrade is a cool feature --- in the end the "cost" of running a home RAID array is the cost of the electricity ... and I'm pretty sure the draw of the 1.5T drives is very similar to the 750G drives. I'm not sure I see this feature being used a lot in production, tho. It's a pretty high stress on the array for a long time.
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