On Mon, May 05, 2008 at 01:31:10PM -0500, Les Mikesell wrote:

> > But I also had an SW RAID with some mysterious missing member.
> > Supposedly, I did something wrong, but after all, I couldn't use mdadm
> > for monitoring any more because it always complained although there was
> > no problem.
> 
> A missing member doesn't bother raid1 at all.

It bothered mdadm --monitor! It always complained, there seemed to be no
way to fix it, so monitoring became useless.

> > That's one of the issues still bugging me - I'd like to have a live copy
> > of the whole pool. RAID doesn't protect from filesystem corruption and a
> > lot of related accidents. 
> 
> The way I do it is to create a raid1 with 3 members, one specified as 
> 'missing'.  Then once a week I put in a disk and 'mdadm --add ...' the 
> partition to the array.  When it finished mirroring (a little over 2 
> hours for a 750 gig SATA), I momentarily stop backuppc and unmount the 
> array so the filesystem is clean, then fail and remove the partition and 
> rotate that disk offsite.  That way I always have a pair of mirrored 
> disks locally and one or two slightly out of data offsite.

Bad luck. My backuppc file system is already at 900 GB and located in an
LVM volume which is on a HW RAID5 of 3x750 GB SATA disks. I wonder
whether something similar would be possible with LVM snapshots or
somesuch... but I suppose, I would pay yet another performance penalty.

Tino.

-- 
„What we resist, persists.” (Zen saying)

www.craniosacralzentrum.de
www.forteego.de

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