Date: Sat, 09 Jun 2007 00:59:02 -0700 From: Darren Reed <darrenr@freebsd.org> To: Josef Karthauser <joe@FreeBSD.org>, Bakul Shah <bakul@bitblocks.com>, current@FreeBSD.org Subject: Re: zfs drive configurations? Message-ID: <466A5DC6.4020303@freebsd.org> In-Reply-To: <20070609020826.GA7887@genius.tao.org.uk> References: <20070608223500.GA1250@genius.tao.org.uk> <20070609011724.B97CD5B52@mail.bitblocks.com> <20070609020826.GA7887@genius.tao.org.uk>
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Josef Karthauser wrote: > On Fri, Jun 08, 2007 at 06:17:24PM -0700, Bakul Shah wrote: > >>> What if I have 5 200gb drives configured as a raidz pool, and then I >>> replace one of the 200gb drives with a 400gb one. Operationally what >>> would I do? >>> >> I believe you can do something like >> >> zpool replace <pool> <device> >> >> The new device will get "resilvered" -- get all the missing >> data put on it and then brought up for operation. This can >> take a while. >> >> Note that you will not be able to use the extra disk until >> *all* the disks in a group (mirror or raid) have been >> replaced with bigger disks. >> > > Does it make sense to partition my disks into some nominal smaller > chunks: D1a-g, D2a-g, ... D5a-g and run a number of raidz across the > drives in parallel, D1a D2a .. D5a, etc? > No. ZFS's design assumes that what it sees in terms of performance and operational characteristics are for a complete drive, so if you split up a drive into partitions and merge part A and part B into ZFS, it will schedule work for them as if they are different drives. Darren
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