Thanks all for the help.
To use the space more efficiently what I decided to do is use vtapes, limit
the file size to 10GB and after a full backup just scp the related files to
a server in the office. I still have to do the proof of concept setup but
from what I'm reading this should be doable.
Bill, great article. Thanks.
-- Peter
On Thu, Mar 28, 2013 at 12:25 AM, Geert Stappers <
geert.stapp...@vanadgroup.com> wrote:
> Op 2013-03-27 om 13:12 schreef Paul Mather:
> > On Mar 26, 2013, at 11:44 PM, Bill Arlofski wrote:
> > > On 03/26/13 22:33, Wood Peter wrote:
> > >> Hi,
> > >>
> > >> I'm planning to use Bacula to do file level backup of about 15 Linux
> > >> systems. Total backup size is about 2TB.
> > >>
> > >> For Bacula server I'm thinking to buy Dell PE R520 with 24TB internal
> > >> storage (8x 3TB disks) and use virtual tapes.
> > >
> > > Hi Peter. First, you're going to want some RAID level on that server
> and
> > > RAID0 is not (IMHO) RAID at all. :)
> > >
> > > At a minimum you're going to want to set up (for example) RAID5 in the
> server
> > > which will give you a maximum of 7 x 3 = 21 TB since the equivalent of
> 1 full
> > > drive is used for parity, spread across all of the drives in a RAID5
> array.
> > >
> > > Having said that, RAID5 does not have the best write speeds, but other
> RAID
> > > levels that will give more redundancy and better write speeds will use
> > > significantly more drives and give you less total storage. You may
> need to
> > > spend some time to consider your redundancy and read/write throughput
> > > requirements.
> > >
> > > Also, you will generally want to configure at least one drive as a hot
> spare
> > > so the RAID controller can automatically and immediately fail over to
> it in
> > > the case of a drive failure in the array.
> > >
> > > So that takes away at least 3 more TB, so now your down to 18TB total
> storage
> > > with a minimally configured RAID5 array with 1 hot spare.
> > >
> > > Just some things to consider. :)
> >
> >
> > Another thing to consider is that with large capacity drives (3 TB)
> > combined into large RAID-5 arrays there is an increased likelihood of
> > a catastrophic array failure during an array rebuild due to an initial
> > drive failure. For this reason, RAID-6 would be preferred for such
> > large arrays.
> >
> > Reliability of large RAID arrays is one of the motivations
> > behind raidz3 (triple-parity redundancy) in ZFS. See, e.g.,
> > http://queue.acm.org/detail.cfm?id=1670144 for details.
> >
>
> Thanks for the advice on RAID configuration. Now we can go back to
> > >> 24TB internal storage (8x 3TB disks) and use virtual tapes.
> so (cheap) disks as alternative to backup tapes.
>
>
> Groeten Stappers
>
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