Alan,
We are TSM 4.2.2 region=512M on os390 2.10 with gigabit osa
My summary stats from last night for 102 clients show
TOTAL FILES BACKED UP:       214388
TOTAL MEGABYTES BACKED UP:   106219
TOTAL NETWORK TIME(MINUTES): 2723
TOTAL BACKUP TIME(MINUTES):  4863
You should be able to see from your query active statistics (not 100% but near
enough) where your clients are spending their time.
You need to look at these values to see whether you are network constrained
Data transfer time:
Network data transfer rate:
Aggregate data transfer rate:
Elapsed processing time:

If the majority of the elapsed processing tine is accounted for by the data
transfer time then likely you have a network issue.
You do not say if anything else is using the network overnight as this will have
an impact.
Also are the backups spread evenly during your window
Schedule some half houly q storage to cover your backup window, this will give
you a good clue to whether there is a particular peiod of the night
when TSM throughput drops right off.
Hope that helps,
John




Alan Davenport <alan.davenport AT selective DOT com> on 02/12/2003 03:46:23 PM

Please respond to "ADSM: Dist Stor Manager" <adsm-l AT vm.marist DOT edu>

To:   adsm-l AT vm.marist DOT edu
cc:    (bcc: John Naylor/HAV/SSE)
Subject:  OS390 TSM Performance questions.



Hello,

        We're running TSM v5.1.5.4 on an IBM 20660A2 processor running OS390
v10. There is a 100Mbit, single port OSA card on the processor. We are
backing up 197 clients per night. MAXSCHEDSESSIONS is set to allow 116
simultaneous backup sessions. Our backup window begins at 20:00 and ends at
07:30 the next morning. We are seeing poor performance on our backups during
the window.  For example, one server that will backup in 6-7 minutes outside
the window takes hours to complete during the window. The TSM server has a
region size of 1280M and MPTHREADING is set to YES. Self tune buffer size
and TXN size is enabled. We are backing up to a 100GB disc buffer to an EMC
model 8830 drive array. On average we backup 30-40GB per night with a peak
of 75-80GB.

        I know there are much larger shops backing up many more servers out
there running OS390 also. What I would like to know is, on large shops, what
is your OSA configuration? Are you running multi-port OSAs and/or gigabit
cards? For comparison, I would also like to know how many clients you are
backing up per night. Where do you think the bottleneck is? Have you seen
similar problems and what did you do to help alleviate the problem? I am
fairly confident that TSM is not CPU constrained during the window. We
recently moved TSM to a higher service class with little effect on the
problem.  Do you feel we are saturating the OSA card?

        Any thoughts and suggestions would be greatly appreciated.

          Take care,
               Al

Alan Davenport
Senior Storage Administrator
Selective Insurance Co. of America
alan.davenport AT selective DOT com
(973) 948-1306










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