LVM big problem
Wolfgang S. Rupprecht
wolfgang.rupprecht+gnus200810 at gmail.com
Sat Oct 4 17:29:21 UTC 2008
Luc MAIGNAN <luc.maignan at winxpert.com> writes:
> I've setup a LVM volume on several disks. It appears that one at
> least of the disks has crashed. Is there a way to recover data on
> the good disks or all is lost ?
>From your backups? (Sorry! Been there, felt your pain.)
A few years ago I once foolishly had 3 of Seagate's largest disks at
the time combined into a single logical volume spanning the volume
group. The same thing happened to me. One disk died leaving me with
1/3 of my data blocks missing in action. Not much one can do. It
isn't like having one or two bad blocks on a disk where the filesystem
is mostly ok. Here 1/3 of everything is missing.
It was a good lesson to me as to why LVM across multiple disks is a
bad idea. The overall reliability rate is the product of each of the
reliability rates. If the disk is 95% reliable (5% failure rate) you
end up with (* 0.95 0.95 0.95) 0.857 (or roughly 86% overall
reliability). As it turns out the Seagate 200GB and 250GB SATA's I
had both had a 50% failure rate in 2 years.
Wolfgang S. Rupprecht http://www.full-steam.org/ (ipv6-only)
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