[Gllug] RAID 1+0 vs 0+1

[Rich Walker]

Andy Smith <andy at lug.org.uk> writes:

> On Thu, Mar 09, 2006 at 08:09:10PM +0000, Rich Walker wrote:
>> Andy Smith <andy at lug.org.uk> writes:
>> 
>> >
>> > In terms of resilience there is no difference.  You can stand to
>> > lose up to 3 disks in either setup.  If you have a mirror of two
>> 
>> Except there are more failure patterns that break completely a 0+1 than
>> a 1+0.
>
> Hmm, yes, right you are.  Never bothered to calculate it as 0+1
> always seemed like a bad idea for the other reasons mentioned.

Reliability calculations. Always depressing.

If I was really bored I'd do the calculations for the probability that
mirrors-across-networks are corrupt from the start...

cheers, Rich.

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