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: [EMAIL PROTECTED] *********************************************************************** * I think I've got the hang of it now: exit, ^D, ^C, ^\, ^Z, ^Q, F6, * * quit, ZZ, :q, :q!, M-Z, ^X^C, logoff, logout, close, bye, /bye, * * stop, end, F3, ~., ^]c, +++ ATH, disconnect, halt, abort, hangup, * * PF4, F20, ^X^X, :D::D, KJOB, F14-f-e, F8-e, kill -1 $$, shutdown, * * kill -9 1, Alt-F4, Ctrl-Alt-Del, AltGr-NumLock, Stop-A, ... * * ... "Are you sure?" ... YES ... Phew ... I'm out * ***********************************************************************
