On 4/23/2010 8:13 AM, Saturn2888 wrote:
>
>>> avg-cpu:  %user   %nice %system %iowait  %steal   %idle
>>> 19.91    0.04    2.99   70.84    0.00    6.23
>>
>> But, that 70% iowait number pretty much tells you what the machine is doing 
>> with
>> most of its time...
>>
>
> I did "watch iostat" and saw that consistently.

That's probably not unusual for an active backuppc server.  Moving a 
disk head around is orders of magnitude slower than any other computer 
operation and it is typically the bottleneck.   The things that can help 
are putting the archive on a separate mounted partition with nothing 
else on the drive, adding RAM, using a raid array with many disks, 
tuning the run concurrency, caching rsync checksums, skewing the full 
runs to different days, etc.  At some point it may be cheaper/easier to 
just run more servers than to scale up the disk system.  You probably 
have other machines that don't do anything else at night anyway and the 
price is right on the software.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com

------------------------------------------------------------------------------
_______________________________________________
BackupPC-users mailing list
BackupPC-users AT lists.sourceforge DOT net
List:    https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki:    http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/