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Date:      Tue, 11 Apr 2000 10:37:36 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Michael Jung <mjung@npc.net>
Cc:        FreeBSD Questions <questions@FreeBSD.org>
Subject:   Re: Vinum - rebuildparity
Message-ID:  <20000411103736.G26373@freebie.lemis.com>
In-Reply-To: <D17F4A008AD9D3118D6000805FEDF35805083B@EXCHANGE1>
References:  <D17F4A008AD9D3118D6000805FEDF35805083B@EXCHANGE1>

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On Monday, 10 April 2000 at 14:26:09 -0400, Michael Jung wrote:
> If a disk becomes stale in a plex, what is the correct proceedure to
> have the stale drive rebuilt from parity on the remaining drives?
>
> Here is my config:
>
> (root@news) /usr/home/staff/mikej$ vinum list
> 4 drives:

Please don't wrap these lines, it makes it very difficult to read.

> D d1                    State: up       Device /dev/da1g        Avail: 0/8667 MB (0%)
> D d2                    State: up       Device /dev/da2g        Avail: 0/8667 MB (0%)
> D d3                    State: up       Device /dev/da4g        Avail: 0/8667 MB (0%)
> D d4                    State: up       Device /dev/da6g        Avail: 0/8667 MB (0%)
>
> 1 volumes:
> V raid0                 State: up       Plexes:       1 Size:         25 GB
>
> 1 plexes:
> P raid0.p0           R5 State: degraded Subdisks:     4 Size:         25 GB
>
> 4 subdisks:
> S raid0.p0.s0           State: up       PO:        0  B Size:       8667 MB
> S raid0.p0.s1           State: up       PO:      256 kB Size:       8667 MB
> S raid0.p0.s2           State: stale    PO:      512 kB Size:       8667 MB
> S raid0.p0.s3           State: up       PO:      768 kB Size:       8667 MB
> (root@news) /usr/home/staff/mikej$
>
> I've tried doing "vinum rebuildparity raid0.p0" and vinum logs
>
> 10 Apr 2000 16:12:34.487534 *** vinum started ***
> 10 Apr 2000 16:12:34.489817 rebuildparity raid0.p0
>
> But nothing actually happens.... Ok what am I missing...
>
> FreeBSD news.npc.net 4.0-20000214-CURRENT FreeBSD 4.0-20000214-CURRENT
> #6: Thu Mar 30 16:17:21 EST 2000
> root@news.npc.net:/usr/src/sys/compile/news  i386
>
> Vinum is loaded as a module

'rebuildparity' is intended to rebuild the parity blocks of a plex in
the "up" state.  To start a stale subdisk, use 'start':

  start raid0.p0.s2

There have been problems with this function under RAID-5.  I'd
recommend backing up the volume first, just in case it turns to
gibberish.

Greg
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