On Friday 11 November 2005 05:18, Montagni, Giovanni wrote:
>I have a problem with amanda "speed".
>I have an lto drive with 100gb tape. To fill that tape amanda take more
>time than necessary, because it takes about 8 hours.
>LTO speed is ~10 Mb/s, so i expect that the tape is filled up in about
> 3 hours.
>I also have another lto drive, on a windows machine and it takes 3 hour
>to fill tapes.
>
>What parameters i have to set-up to speed up amanda?
>Does the presence of the holding disk influence performance?
Without a holding disk, amanda writes the dumps direct to tape, and
cannot run several in parallel, which extends the time considerably.
The holding disk needs to be maybe 2-4x the size of the largest DLE for
best performance. The data is not erased from the holding disk until
the file has been completely written, and there needs to be room for
the other, smaller DLE's that may get done while the big one is writing.
>And what about compression? Should i set client best or server best?
That depends on which box has the most horsepower, but theres a fudge
factor in a multiple box environment that encourages the use of client
best because each client then does its own, all of them at the same
time, and the network bandwidth usage is also reduced since the files
sent are smaller. In my setup, only 2 machines, one is a 500 mhz
K6-III, the other is a XP-2800 Athlon. I have the client doing its own
compression as its quicker than saddling the athlon with all of it.
>Thanks in advance.
>
>Giovanni
>
>
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