Date: Wed, 08 Jul 2009 09:38:01 +0100 From: Pete French <petefrench@ticketswitch.com> To: bp@barryp.org, dan.naumov@gmail.com Cc: freebsd-stable@freebsd.org, freebsd-geom@freebsd.org Subject: Re: glabel metadata protection (WAS: ZFS: drive replacement performance) Message-ID: <E1MOSfB-0004Rl-GS@dilbert.ticketswitch.com> In-Reply-To: <4A53ED2D.4070309@barryp.org>
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> I would say in this case you're *not* giving the entire disk to the > pool, you're giving ZFS a geom that's one sector smaller than the disk. > ZFS never sees or can touch the glabel metadata. Is ZFS happy if the size of it's disc changes underneath it ? I have expanded a zpool a couple of times simply by changing the size of the partition and rebooting the machine - it comes up with the new amount of free space fine. Never tried it the other way though. The reason I mention it is that someone suggested glabeling a drive in an existing pool and using replace to swap it over. Which should be good I guess unless the last sector was in use. ZFS spreads stuff all over the disc as I unserdtand it though, so that might not be a good assumption, even on a fairly empty filesystem. -pete.
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