[aklug] Re: Comments Please?

Arthur Corliss wrote:
> On Mon, 28 Jun 2010, Arthur Corliss wrote:
>
>
>> In a nutshell he's focusing on double-disk failures as a statistical
>> probability. In other words, double-disk failures are deadly to RAID5 data
>> and they happen more frequently than many think. This is true, moreso if
>> you're accustomed to running disks from the same production run.
>>
>> I still use RAID5 myself, but primarily on a SAN with automatic recovery
>> with hot standby disks. And I've got a good mix of drives from many
>> different production runs. Pretty easy to do when you buy mostly used. ;-)
>>
>
> I should also point out that as long as you keep your RAID5 arrays fairly
> small the rebuild times are fairly manageable. If I were building multi-TB
> arrays, though, I'd be very frightened of RAID5.
>

Network Appliance by default does RAID-DP, or RAID-dual parity. So,
you're protected from dual disk failures. I usually set up my
aggregates as RAID-DP with a hot spare as well.

Crappy part about that is you lose three drives' worth of space right
off the bat; awesome part is that you're covered in the event of a
statistically unlikely event.

-- 
Adam
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