[Sussex] Recovering from RAID 5

[David Morris]

Steve Dobson wrote:
> Hi John
> 
> I'm afraid I don't have a recovery solution for you.  I read this
> article [1] a year or two ago and was convinced by it.  I will admit
> that I haven't checked the maths behind it, but the principles do appear
> sound to me.  As disk capacity increases for a given format then they
> must be packing the tracks closer and closer together.  I can't see this
> improving the read failure rate.  Couple this with the requirements that
> RAID 5 requires for recovery and complete RAID 5 failure during rebuild
> becomes a significant increasing probability as disk capacity increases.
> 

You could also look RAID 6, which will give you more tolerance against
failure.  Also worth reminding people that RAID != Backup


Dave

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