Tino Schwarze 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.

>> I start with the premise that I want to be able to restore from a 
>> mirrored copy of my backuppc archive.  It hasn't actually been necessary 
>> but I still consider it a big plus that in a disaster recovery scenario 
>> I can plug this copy into a laptop and restore files instantly.
> 
> 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.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com



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