On Mon, Jun 06, 2005 at 10:56:00AM -0400, Chris Loken wrote:
> 
> 
> I have one amanda server and one client. I have 2 separate amanda 
> configs to backup different DLEs on the client.
> 
> The problem is that backups with one config seem to be much slower than 
> the other. The amanda tar files on the holding disk are being created at 
> about 10MB/s with one config and 1MB/s for the other config. The tape 
> writes are fine - it's the creation/transfer of the backup from client 
> to server that is at issue. Some sendbackup numbers from the logs are 
> shown below.

I tried to look at the data in a different format.
I've dropped any entries that took less than 60 seconds.

          TIME             SIZE          RATE

"Good Config"
          88.705          248064000      2.7MB/s
         436.415         4142970880      9.1MB/s
         566.154          397721600      0.7MB/s
         732.676         2780784640      3.6MB/s
        2158.990        28192501760     12.0MB/s
        3991.073        41417011200      9.9MB/s

"Bad Config"
          123.051        1158154240      9.0MB/s
           83.428        1158922240     13.0MB/s
         3676.957       17134336000      4.4MB/s
        15626.616       19249469440      1.2MB/s
         5863.356       18078484480      2.9MB/s
        33717.794       42903377920      1.2MB/s

It seems there are a couple in each config out of the "norm".
I.e. a couple in the bad config doing well, a couple in
the good config doing poor to mediocre.


Are there any "spindle" issues involved.  I.e. are some of
the poorly performing DLE's on the same disk drive(s) and
should not be backed up at the same time to reduce head
thrashing?

Is the ave file size greatly different in well vs. poor
performing DLE's?  Tar is known to greatly slow down when
it must access lots of directory entries and inodes.

-- 
Jon H. LaBadie                  jon AT jgcomp DOT com
 JG Computing
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