Amanda-Users

Question on bandwidth limits

2006-10-27 07:59:09
Subject: Question on bandwidth limits
From: Joel Coltoff <joel AT wmi DOT com>
To: amanda-users AT amanda DOT org
Date: Fri, 27 Oct 2006 11:49:29 +0000
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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