Re: [ADSM-L] Tsm server possibly limiting backup performance
2011-05-27 11:16:30
The networking itself is just one element in the overall backup operation...
You don't say what measurement point you are looking at for your throughput
numbers. If it is the "Network data transfer rate" TSM summary statistic, that
reflects TSM interacting with the network layer of the operating system, with
affecters such as TSM TCPWindowsize, Path MTU Discovery where that is in
effect, etc. Unexpected, elongated network routing can delay things; but your
FTP test should have run into that if were a factor...unless conditions are
changing depending upon time of day. When a TDP is involved, it can only pass
data as fast as the back end application provides it. A traditional B/A backup
can be impaired by the paging incited by the amount of memory taken by the
Active files list. If standard measurement points don't reveal a cause, a
client trace with a representative data set can be illuminating.
Richard Sims
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