Joshua Baker-LePain wrote:
Is that 3-400GB every night, or over a dumpcycle? If the former, you'll
need a faster tape drive. Sony claims 15MB/s for AIT2, but that's
assuming 2.6:1 compression. So native tape speed is about 5.8MB/s, which
gets you ~20.7GB/hr, so about 120GB in your 6 hour window. If the latter
and your dumpcycle is long enough (even a week would be long enough), then
your tape drive is up to the task.
Completely correct.
Take also into account that using a large holdingdisk(s), and a fast
network, Amanda does multiple dumps from different hosts at once.
This could result in all dumps being finished within a much smaller
time. The backups collect on the holdingdisk, and there the slower tape
drive pickes them up and writes them to tape.
If your window concerns the dump-time, spend some money on holdingdisks.
If you can't get the backup window to fit using only bandwith and
holdingdisk space, then a faster tapedrive will not help either.
My archive backup in the weekends dumps in less than 8 hours, but the
tapedrive needs 12 hours to write. (AIT-1 at 3 Mbyte/sec on a Celeron
300 MHz, 128 Mbyte RAM, with 80 Gbyte IDE holdingdisk).
--
Paul Bijnens, Xplanation Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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