On Wednesday 20 November 2002 17:36, Jean-Louis Martineau wrote:
>On Wed, Nov 20, 2002 at 01:47:50PM -0600, Deb Baddorf wrote:
>> What kind of optimiaztion does amanda use while flushing
>> dumps to tape?
>>
>> While doing the dump initially, she seems to
>> optimize to get the small jobs done first, and thus they
>> go onto tape in a similar order. But I'm currently without
>> a stacker. So only the first part of the dumps make it
>> to tape "live" (so to speak) and the rest get flushed as I
>> manually mount tapes. I'm hoping that some kind of
>> knapsack-packing algorithm is used ..... to fit the largest
>> files on the tape first, but then to add smaller ones to
>> fill the top of the "sack".
>> My archival "do all the level 0's" is taking up 5 tapes,
>> hence the optimization question!
>
>There is no optimazation, first in, first out.
>That's a need feature.
>
>Jean-Louis
Humm, from a recent example/amanda.conf:
-------------
dumporder "sssS" # specify the priority order of each dumper
# s -> smallest size
# S -> biggest size
# t -> smallest time
# T -> biggest time
# b -> smallest bandwitdh
# B -> biggest bandwitdh
# try "BTBTBTBTBTBT" if you are not holding
# disk constrained
------------
I'm assuming that when Deb asked about it, using the word
'flushing', that Deb meant a normal amdump run as opposed to a run
of amflush, or an autoflush. I've no idea whether its active for a
flush, or just an amdump run. I have no idea if it even works, but
I'll find out tonight if I can stay awake till then. I just
modified mine to do the biggest ones first, and amstatus should be
able to see if its working that way pretty shortly after the
estimates are done.
--
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz 512M
99.19% setiathome rank, not too shabby for a WV hillbilly
