So's and Dos in replication log file

Team !

 

We have manual duplication running from one MSDP to another MSDP. Whenever i refer the "/disk/log/spad/replication.log" file i see 

 

Do's to replicate ? What exactly are these Dos

 

 

May 14 11:20:42 INFO [140097112409856]: Transfer time                                      : 0.42 sec
May 14 11:20:42 INFO [140097112409856]: Transfer rate                                      : 0.32 MB/sec
May 14 11:20:42 INFO [140097112409856]: De-dup percentage                                  : 92.71
May 14 11:20:42 INFO [140097112409856]: Total number of DOs to replicate                   : 8
May 14 11:20:42 INFO [140097112409856]: Total size of all DOs to replicate                 : 139405 bytes
May 14 11:20:42 INFO [140097112409856]: Total size of all segments that were sent          : 10165 bytes
May 14 11:20:42 INFO [140097112409856]: Number of segments                                 : 20
May 14 11:20:42 INFO [140097112409856]: Number of segments sent                            : 6
May 14 11:20:42 INFO [140097112409856]: Details:

 

and similarly i see "This replication job is currently using a bandwidth limit of 0 KB/s, 1 SOs has been sent in current batch."

 

What exactly is SOs ?

 

Thanks,

PranavB