On 03/31/10 18:35, Alfredo J. V. P. wrote:
> On Miércoles 31 Marzo 2010 23:23:47 Phil Stracchino escribió:
>> RAIT span/concat
>>
> RAID 0. Yes, but no disk involved. Tape drives instead.

No, actually, you would not want a RAID (or RAIT) 0 setup.  Striping
data across devices of different sizes is always a bad idea.  What you
want to do is create a virtual concat device, in which you logically
append the 12GB DDS3 drive to the 20GB DDS4 drive to create a virtual
32GB device.  If you striped them, you'd end up with a fast virtual 24GB
device plus 8GB of wasted space.

Unfortunately, the only RAIT implementation I am currently aware of in
any backup software is in Zmanda.


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
  alaric AT caerllewys DOT net   alaric AT metrocast DOT net   phil AT 
co.ordinate DOT org
         Renaissance Man, Unix ronin, Perl hacker, Free Stater
                 It's not the years, it's the mileage.

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