how to measure backup MB/s ?

RobFantini

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May 24, 2012
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We're trying to increase backup to shared storage transfer rates. BUt Need to know which MB/s to use.

I assume it is best to use the TOTAL line from a backup email report then the MB/s within the detail log.

For instance if a TOTAL line looks like this:

TOTAL 00:32:21 101.91GB

then the actual MB/s would be:

32 Minutes x 60 + 21 = 1941 total seconds

101.91GB * 1024 = 104,355 total MB

size divided by seconds:
104,355 / 1941 = 53.7 MBs


that is a lot different the the detail parts of the log which show lines like these:
Code:
  101: Aug 10 19:36:56 INFO: transferred 34363 MB in 240 seconds (143 MB/s)

  105: Aug 10 19:45:05 INFO: transferred 59055 MB in 486 seconds (121 MB/s)

  4113: Aug 10 19:47:51 INFO: transferred 42949 MB in 163 seconds (263 MB/s)
I assume the detail log MB/s is skewed due to doing calculation based on non compressed data? But I am not sure.

Which MB/s should be used to determine backup/transfer speeds?
 
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