[BackupPC-users] Slow Rsync Transfer?

Hi,

I've been running BackupPC for a while now and I've been noticing an odd trend, 
I have 29 servers which are identical in hardware and very similar in 
configuration. 28 of these servers transfer at 30-40MB/s via Rsync, one host 
and the database servers transfer between 2-10MB/s, even when ran individually 
when no other hosts are being backed up. 

I've checked the IOwait on both the  BackupPC server which is a 12 disk raid 
10, with 2TB of usable space, 15k RPM drives, it has 5% IO while the host has 
0%. 

I've done simple sftp transfers and they transfer at 20-30MB/s with no issues. 

Here is a backuppc log on one of the problem hosts, 

    Backup# Type    Filled  Level   Start Date      Duration/mins   Age/days    
    Server Backup Path
    112     full    yes     0           2/5 19:06        62.3                   
      81.6    /backuppc/pc/ras03/112
    140     full    yes     0                   3/5 22:00        55.8           
              53.5    /backuppc/pc/ras03/140
    154     full    yes     0                   3/20 04:35      465.2           
           39.2    /backuppc/pc/ras03/154
    161     full    yes     0                   3/27 21:42      142.3           
           31.5    /backuppc/pc/ras03/161
    167     full    yes     0           4/4 18:00        854.0                  
    23.7    /backuppc/pc/ras03/167
    173     full    yes     0           4/11 18:00      1032.9                  
 16.7    /backuppc/pc/ras03/173
    174     incr    no      1                   4/12 18:00      152.2           
          15.7    /backuppc/pc/ras03/174
    175     incr    no      1           4/13 18:00      1019.5                  
 14.7    /backuppc/pc/ras03/175
    176     incr    no      1           4/14 18:00      1594.4                  
 13.7    /backuppc/pc/ras03/176
    177     incr    no      1           4/15 21:11      2094.5                  
 12.6    /backuppc/pc/ras03/177
    178     full    yes     0           4/19 03:00      2037.8                  
 9.3     /backuppc/pc/ras03/178
    179     incr    no      1           4/20 18:16      1147.2                  
 7.7     /backuppc/pc/ras03/179
    180     incr    no      1           4/21 18:04      1840.7                  
 6.7     /backuppc/pc/ras03/180
    181     partial yes     0           4/25 12:32      2389.1                  
 2.9     /backuppc/pc/ras03/181

I've already modified the checksum but it had no impact, 
'--checksum-seed=32761'. How does backuppc calculate the duration and speed? I 
know my oracle hosts, I kick off the RMAN prior to pulling the backuppc, so 
that might explain the "slow transfer speeds" if it calculated size/time which 
is inclusive of the RMAN (Database Export) backup. This host (above) boggles me 
though, these are static files that are being transferred and all other 28 
hosts transfer just fine. 

Thanks in advance for any input or troubleshooting steps. 
 
_______________________________________________
Dan Lavu
System Administrator  - Emptoris, Inc.
www.emptoris.com Office: 703.995.6052 - Cell: 703.296.0645



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