Well,
I'll reference two things here, folks using TDP/R3 (threaded
version) and
TSM client compression might want to read ALL of this.
PMR93135 was from where tdp/r3 3.2.0.8 ignored the setting of
"client determined" compression.
This was fixed in 3.2.0.11.
Now, TDP/R3 ~RLCOMPRESSION~ sucks... all it does is take out free space
basically.
(that is my own personal opinion)
I like setting client compression ON and using that because we see about
3.8/1 compression !
So, which can be sent between two boxes the fastest, 1 TB or 270 GB ????
(duh...)
BUT you will drive the heck out of your SAP DB servers !
Oh, and if you send to cached diskpools, ya know the old deal of
~compression on~ & ~compressalways no~
In working my PMR93135 problem, IBM Germany took things one step better...
tdp/r3 from 3.2.0.11 (and beyond) preallocates tsm server storage at
110% of actual file size,
if a file grows with compression it won't ~seem~ to grow and thus
resends are eliminated
IF you happen to still see resends due to data growing with
compression,
there is now an environment variable XINT_TSMOFFSET
pre-allocations will occur at a +10% by default
OR what ever value is specified in the environment variable
XINT_TSMOFFSET
COOL !!!!!!!!!
NOWWWWWWWWWWWW
PMR04127 when using client compression and multiple sessions (like
10, 15, or 20)
TDP/R3 just WILL NOT USE CPU CYCLES !!!!!!!!!!!!!!
It is from a thread option they were using when creating
those threads.
I currently have a fix-test executable for 3.2.0.x
The fix won't be out until end of 1st qtr 2003 in 5.1 TDP/R3
(I know, ((((((()
IF you are running with client compression and your CPU just isn't being
utilized AND you are on a TDP/R3 that uses threads AND you need more
performance, you might look into getting the fixed executable.
That will probably take opening a problem, making reference to pmr04127,
etc.....
BUT back to your main question...
We set client compression ON in the dsm.sys file in the SErver entry
COMPRESSION YES
Then, when using TDP/R3 3.2.0.11 & later, in the dsm.opt file we set
COMPRESSALWAYS YES
We send the data to a cached diskpool during the night & migrate to tape
during the day.
If we experience a SAP PR failure, we restore from the cached diskpool copy.
(generally in record time)
hope this helps :-)
Dwight E. Cook
Software Application Engineer III
Science Applications International Corporation
509 S. Boston Ave. Suite 220
Tulsa, Oklahoma 74103-4606
Office (918) 732-7109
-----Original Message-----
From: brian welsh [mailto:brianwelsh3 AT hotmail DOT com]
Sent: Tuesday, December 10, 2002 4:19 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Help on TDP for SAP R/3 Oracle
Hello,
Server AIX 5.1, TSM 4.2.2.8. Client AIX 4.3, TSM 4.2.1.35, and TDP 3.2.0.11
Question about compression.
We forced compression for this client at server-side, by setting option
Compression at client-node options to server. In client-option file there is
no compression-option.
We thought that this will be enough to compress also TDP -backup and archive
data. We checked and there is no compression. Tivoli Support say first that
TDP is compressing the files always, it a feature of TDP. And later they say
we have to activate this in TDP on the client.
I'm wondering how other sites set compression in this situation. On the
server, in TDP, on the client, ...
Thanx,
Brian.
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