Replication speeds?

Nik Conwell nik at
Wed May 9 11:05:58 EDT 2007

What sort of rates are you all getting for replication?

At 2.3.7 for a manual sync_client for a user, I'm seeing ~35MB/minute  
across a 100M net to a linux SW RAID 1 pair of U320 disks.

Is this speed typical or abysmal?

Disks appear to be holding me back:

Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s    wkB/ 
s avgrq-sz avgqu-sz   await  svctm  %util
dm-0         0.00   0.00  0.00 429.96    0.00 3439.65     0.00   
1719.83     8.00     7.24   16.75   1.86  80.01

Production (40,000+ users) would probably be FC and gigE...

Nik Conwell
Boston University
nik at

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