----- Original Message -----
> 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.
>
My best speed on Windows and Linux servers via rsync is 21 MB/s, the average is
closer to 6 MB/s.
Gerald
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