On 1/14/11 2:37 AM, Sorin Srbu wrote:
>
>> Is there a lot of block-level duplication among these?  If so it might
>> be worth setting up something with zfs.
>
> How can I tell?

Ask someone who creates the large data sets if they copy any or all of it from 
something that already exists.  Backuppc will not pool data if there is one 
byte 
of difference in a huge file, where block level de-dup in the filesystem would 
use space for unique blocks.  If everyone is working with slightly different 
versions of the same data, you could easily save enough space to run a raid 
level that would protect against a disk failure.

>> You should be able to run the
>> free version of nexentastor on something that size - not sure how it
>> would work with backuppc.
>
> My next question was going to be about filesystems. 8-)
>
> Ext3 has so far with 1.5TB worked fine and had decent performance, if not a
> speed demon. Xfs isn't supported yet I think in CentOS. Zfs focuses mainly on
> really big files IIRC. Ext4 would maybe have been a good choice, but isn't
> supported in CentOS either if I'm not mistaken.
>
> I'd prefer sticking with CentOS and BPC, as both are relatively known now at
> the IT-department, ie me. 8-) Any particular reason I should look into
> Nexentastor? The Zfs?

Nexentastor gives you a web admin interface so you don't need to know much 
about 
the underlying OS (which is opensolaris) or how to configure zfs.  If you have 
new hardware it's pretty easy to drop in and test.  You could even run it as an 
nfs server with the backuppc system running on something else.  Otherwise if 
you 
can wait another month or so, I'd wait for CentOS6 and use xfs.  Actually 
you'll 
probably want the OS on its own separate small partition(s) anyway so it 
doesn't 
matter that much - but I think RHEL6 (and thus eventually CentOS6) is supposed 
to install on xfs as an option.

-- 
   Les Mikesell
     lesmikesell AT gmail DOT com


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