Eric Siegerman wrote:
On Mon, May 03, 2004 at 10:01:47AM +0200, Paul Bijnens wrote:
Kianusch Sayah Karadji wrote:
[...] the plan was to not put in a
tape, and have amanda backup everything to the dumps Partition. After that
use amflush to move the data from the partition to tapes in several runs.
Why so complicated?
Let it dump to one tape, and flush the rest in the morning to the other
tape(s).
I do our all-level-0 configurations this way, but for a different
reason: it more fully packs the first tape. Since taping doesn't
start until all of the DLEs have been dumped, the largestfit
algorithm has all the data it needs to fill the tape as full as
possible. If instead we let amdump write the first tape,
largestfit would pick the optimum DLE <i>from among those
available at the moment the drive became free</i>, which would be
suboptimal for minimizing tape usage.
There is an interaction between the number of dumpers, dumporder and
taperalgo. See msg:
http://marc.theaimsgroup.com/?l=amanda-users&m=106277015010167&w=2
Conclusion: it sometimes helps to lower the number of dumpers,
and surely to change the default dumporder from "tttTTTTT" to something
like "SSSSSSSS" or "TTTTTTTTT". The border case is indeed to have
zero dumpers while taper is working: first everything to holdigdisk
disk and then flushing optimally to tape.
--
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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