On Wed, Mar 16, 2011 at 1:29 PM, Mike Hobbs <mhobbs AT mtl.mit DOT edu> wrote:
>  On 03/16/2011 01:12 PM, Robison, Dave wrote:
>> Just curious, why not put that jbod into a RAID array? I believe you'd
>> get far better performance with the additional spools and you'd get
>> redundancy as well.
>>
>> Personally I'd set that up as a RAIDZ using ZFS on FreeBSD.
>>
>>
>
> I believe the reason why we decided not to use raid was in case the raid
> array got corrupted.  We would then lose all of our backups..

I believe that is a very big danger with a raid. I never recommend a
single raid array for all your backups. Two raid arrays on separate
raid controllers (preferably separate machines) each containing at
least 1 backup of everything are fine but a single raid to hold your
only backup copy is dangerous.

> Where as
> if one disk dies, we only lose what was on that disk.  There may have
> been another reason but  I think that was the main reason.
>

I do not have time to explain the details at the moment but I
recommend you take a look at the bacula vchanger for what you are
trying to do:

http://sourceforge.net/projects/vchanger/

John

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