[linux-lvm] Re: raid 1 on a single disk
Måns Rullgård
mru at inprovide.com
Sun Nov 14 00:41:40 UTC 2004
Greg Freemyer <greg.freemyer at gmail.com> writes:
>>
>> P.S. I'd be really tempted to talk to the person asking you to do
>> this, and ask them what they hope to achieve...
>>
> I can almost envision times it would be useful. i.e. disk speed is
> unimportand, disk data rarely changes, but when it does it is very
> important, and traditional backups are not feasible for some unknown
> reason?
>
> By having the data written to 2 different places on the disk, the
> likelyhood of a failure making it truly unrecoverable is extremely
> small.
Shall I tell you about the 80GB disk I had that suddenly dropped dead,
refusing all form of communication?
> ie. If you have disk media problems, likely only one location of the
> other will be affected.
>
> If you have a drive electronics failure, you can ship the drive off to
> have recovery performed. (Over $1000 I know, but if the data is
> important.)
I'd rather pay the $100 for a mirror disk, which is also what I do in
my systems, after the lesson learned from the aforementioned failure.
I got four new disks, and configured them as RAID5. Within a month,
one of them failed.
--
Måns Rullgård
mru at inprovide.com
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