Amanda users,
One of my amanda servers uses Vtapes, and has multiple zpools
(ZFS filesystem) assigned to it. Vtapes have been configured
at 1.8 Tbytes, which is a value that seems to be insufficient.
At least based on dump estimates.
I seem to be sitting at level 1 dumps for several nights, and
think that perhaps my bump parameters could be better set.
I think these values are carry-forwards from older amanda versions
as they are no where near the current defaults (per amanda.conf
man page on the web) and are not parameters that we usually mess with.
bumpsize 20 Mb # minimum savings (threshold) to bump level 1 -> 2
bumppercent 20 # minimum savings (threshold) to bump level 1 -> 2
bumpdays 1 # minimum days at each level
bumpmult 4 # threshold = bumpsize * bumpmult^(level-1)
The file systems I'm looking at are in excess of 100Gig and may
we in excess of 500 gig, so not bumping is causing them to be
skipped because total dumps are too large and level 0 dumps are
taking presidents over these level 1 dumps.
I'm also going to check with the data owners, as I'm rather surprised
that these dumps aren't falling under the savings cap.
Than again we had some that where failing for a long time because
the number of files per directory was excessive (zfs has virtually
no limit, but putting several hundred thousand files in a directory
is still not recommended) and we had no level 0 dumps for a while.
Estimates are "server", and that may play into estimates that are
in fact excessive based on lack of current data.
Do you have any recommendations on how to proceed (dump parameters
or other things to look at) from here?
thank you,
Brian
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Brian R Cuttler brian.cutt...@wadsworth.org
Computer Systems Support (v) 518 486-1697
Wadsworth Center (f) 518 473-6384
NYS Department of Health Help Desk 518 473-0773
