Hi,
TSM Client 5.1.5.0
TSM Server Z/os 5.1.5.0
I have been asked to run backups of a server that contains secure data. I
will therefore use TSM encryption, having revised it and read some very
helpful notes on Richard Sims' pages.
During testing i noted:
WITH ENCRYPTION
ANE4952I (Session: 5891, Node: XXXXXX) Total number of objects inspected:
200
ANE4954I (Session: 5891, Node: XXXXXX) Total number of objects backed up:
200
ANE4958I (Session: 5891, Node: XXXXXX) Total number of objects updated:
0
ANE4960I (Session: 5891, Node: XXXXXX) Total number of objects rebound:
0
ANE4957I (Session: 5891, Node: XXXXXX) Total number of objects deleted:
0
ANE4970I (Session: 5891, Node: XXXXXX) Total number of objects expired:
0
ANE4959I (Session: 5891, Node: XXXXXX) Total number of objects failed:
0
ANE4961I (Session: 5891, Node: XXXXXX) Total number of bytes transferred:
529.02 MB
ANE4963I (Session: 5891, Node: XXXXXX) Data transfer time:
945.30 sec
ANE4966I (Session: 5891, Node: XXXXXX) Network data transfer rate:
573.06 KB/sec
ANE4967I (Session: 5891, Node: XXXXXX) Aggregate data transfer rate:
1,455.42 KB/sec
ANE4968I (Session: 5891, Node: XXXXXX) Objects compressed by:
0%
ANE4964I (Session: 5891, Node: XXXXXX) Elapsed processing time:
00:06:12
WITHOUT ENCRYPTION
ANE4952I (Session: 5847, Node: XXXXXX) Total number of objects inspected:
200
ANE4954I (Session: 5847, Node: XXXXXX) Total number of objects backed up:
200
ANE4958I (Session: 5847, Node: XXXXXX) Total number of objects updated:
0
ANE4960I (Session: 5847, Node: XXXXXX) Total number of objects rebound:
0
ANE4957I (Session: 5847, Node: XXXXXX) Total number of objects deleted:
0
ANE4970I (Session: 5847, Node: XXXXXX) Total number of objects expired:
0
ANE4959I (Session: 5847, Node: XXXXXX) Total number of objects failed:
0
ANE4961I (Session: 5847, Node: XXXXXX) Total number of bytes transferred:
342.82 MB
ANE4963I (Session: 5847, Node: XXXXXX) Data transfer time:
263.37 sec
ANE4966I (Session: 5847, Node: XXXXXX) Network data transfer rate:
1,332.89 KB/sec
ANE4967I (Session: 5847, Node: XXXXXX) Aggregate data transfer rate:
782.89 KB/sec
ANE4968I (Session: 5847, Node: XXXXXX) Objects compressed by:
36%
ANE4964I (Session: 5847, Node: XXXXXX) Elapsed processing time:
00:07:28
The node has client compression set to CLIENT.
My questions:
1) Why does the client 'with encryption' have objects compressed by 0%,
when 'without encryption' is 36%. Does encryption nullify compression?
2) 'with encryption' data transfer time is 945 secs (10+ mins). Yet the
elapsed time is only 6mins?
When i run this as a production backup, i will have maybe 30-40gb to backup
and i was trying to estimate how much time this would take. I read on
Richards' notes that encryption will seriosly slow down the time taken to
backup. The test backup was only 528mb, yet the encryption backup was
faster.
So if anyone has any suggestions, they will be very welcome!
Thanks
Jeff White
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