Question on bandwidth limits
2006-10-27 07:59:09
A recent thread on Loooooong backups got me to look at my configuration. It
always seemed to me that it should run a bit faster than it does. I wasn't too
concerned given that it started at 9:00 PM and was done by 2:00 AM. It never
got in the way of things. We are moving to a much larger server and I'd like
to resolve this for the flood of new files we'll have. We are running 2.4.4p2.
I've been trying different numbers in my interface setup and they don't seem
to have any effect. This is what I have in my amanda.conf file. Most of the
DLEs are on the host that runs amanda. I don't have a setting for "netusage"
so I get the default. When the dump is done amstatus reports.
network free kps: 10700
define interface local {
comment "a local disk"
use 10000 kbps
}
define interface ethernet {
comment "10 Mbps ethernet"
use 400 kbps
}
My disklist looks like this
phoenix.wmi.com /export/cdburn project-files 2 local
phoenix.wmi.com /export/cac project-files 2 local
phoenix.wmi.com /export/opt project-files 2 local
phoenix.wmi.com /export/project project-files 2 local
goliath.wmi.com /users /users {
user-files
exclude "./jc517/lightvr/*/*.o"
exclude append "./jc517/lightvr/*/*.bz2"
} 1 ethernet
goliath.wmi.com /export /export {
user-files
include "./wumpus" "./plover" "./uclibc" "./vendor"
} 1 ethernet
Finally, here is the tail of amstatus
network free kps: 6700
holding space : 10119040k ( 99.92%)
dumper0 busy : 4:20:38 ( 94.20%)
dumper1 busy : 0:02:16 ( 0.82%)
taper busy : 3:31:28 ( 76.43%)
0 dumpers busy : 0:14:44 ( 5.33%) no-diskspace: 0:14:44 (100.00%)
1 dumper busy : 4:19:40 ( 93.85%) no-bandwidth: 2:45:21 ( 63.68%)
not-idle: 1:34:19 ( 36.32%)
2 dumpers busy : 0:02:16 ( 0.82%) no-bandwidth: 0:02:16 (100.00%)
If I run amstatus I'll see "no-bandwidth" associated with 1 dumper busy more
often than not.
What's a reasonable number to use so that I have more than 1 dumper running at a
time? I guess the real question is should a single dump saturate connections
to the localhost?
Thanks
- Joel
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