On Mon, 1 May 2006, Bill Moran wrote:
How about our reasons for doing this:
1) We need speedy restores, thus we have a 1T RAID5 array and backup
to disk devices there.
I backup ~20Tb to LTO2. The tapes run almost as fast as most of the
disk arrays (MSA 1000 and Nexsan Atabeast)
2) We _must_ have offsite backups. The RAID5 array is a bit heavy
to carry around ... plus it can only be 1 place at a time.
That's tape-tape migration, OR job cloning - one set locally, one set
offsite.
Our desired solution is to back up to tape and disk simultaneously.
Thus we can take the tapes offsite, while still having fast, local
backups on the RAID5.
Sveral people have requested simultaneous backups for the same reason.
Asking for D-D-T just obscures what you really want.
I expect we're not the only people with such requirements.
Not at all, but 1Tb is a small amount of disk these days.
In any case, the functionality you need can probably be achieved
using bcopy on the backup sets - and given the small dataset you have, it
wouldn't take long.
We achieve our data security with a large data safe(*), as the area is
geologically and politically stable, the only real worry is fire, in which
case instant restoral of service would be impossible anyway, even with
offsite storage.
(*) http://www.phoenixsafe.com/en/viewproduct/4620.html - model 4623.
2+ hour fire resistance and designed to withstand a drop of 10 metres (in
case of floor collapse in multistory building). Ours is sitting on a
specially installed concrete pad and I wouldn't be surprised to find it
standing intact if the building was completely razed around it.
AB
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