Date: Fri, 19 Dec 2008 11:35:19 +0100 From: "Dimitri Aivaliotis" <aglarond@gmail.com> To: "Ulf Lilleengen" <ulf.lilleengen@gmail.com> Cc: freebsd-geom@freebsd.org Subject: Re: gvinum raid10 stale Message-ID: <55c107bf0812190235g408b9e00mf402fa76670c461b@mail.gmail.com> In-Reply-To: <20081218175752.GA10326@carrot.lan> References: <55c107bf0812180320x502847efi53df5a7da68b73e1@mail.gmail.com> <20081218175752.GA10326@carrot.lan>
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Hi Ulf, On Thu, Dec 18, 2008 at 6:57 PM, Ulf Lilleengen <ulf.lilleengen@gmail.com> wrote: > On tor, des 18, 2008 at 12:20:26pm +0100, Dimitri Aivaliotis wrote: > Why do you create 32 subdisks for each stripe? They are still on the same > drive, and should not give you any performance increase as I see it. Just > having one subdisk for each drive and mirroring them would give the same > effect, and would allow you to expand the size. > A good question. I'm not quite sure anymore why I did it this way. I guess that I thought it would bring performance gains, spreading the stripes across the disks. That's probably old-school thinking, and doesn't apply anymore to modern disks. > I don't see how the subdisks could go stale after inserting the disks unless > they changed names, and the new disks you inserted was named with the old > disks device number. That was my initial assumption as well, but it turned out to be incorrect. >> - How can I recover the other plex, such that the data continues to be >> striped+mirrored correctly? > For the volume where you have one good plex, you can do: > gvinum start raid10 > > This command will sync the bad plex from the good one. OK, I've done this now: # gvinum start raid10 GEOM_VINUM: plex sync raid10.p0 -> raid10.p1 started GEOM_VINUM: sd raid10.p1.s0 is initializing <snip> GEOM_VINUM: plex raid10.p1 state change: down -> degraded > For the volume where both the plexes are down, you can try to force subdisks > of one of the plex in the upstate and see if you are able to fsck/mount the > volume. If not, try the same procedure with the other plex. If one of them is > good, you can be pretty certain it is good, and you can do a sync of the > plexes. That's what I did on the server where both plexes were down. I'm sorry if that wasn't clear from my initial message (reordered quote here): >> (I wound up doing a 'gvinum setstate -f up raid10.p1.s<num>' 32 times >> to bring one plex back up on the server that had both down.) >> - How can I extend this raid10 by adding two additional disks? > I assume you want to increase the size, and not add more mirrors, so you > can't. The plexes are striped, and extending the stripes is only supported in > a new gvinum version not yet committed. Great. So, I'm stuck moving the data, rebuilding the RAID, and moving the data back? Good thing I do have an extra server handy... - Dimitri
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