Have a look at your dsmaccnt.log, in particular the MediaWait and
CommWait columns. If you see large figures in both then this suggests to
me that the network connection is not feeding the TSM server fast enough
to support streaming. You must either increase your network throughput
or backup to disk and migrate to tape. Some drives do compression, so
native streaming rate might not be equal to real world streaming rate (I
see between 15 MB/sec and 48 MB/sec for a 3590 fibre attached drive.)
You might try compressing on the client first?

Good luck,
Paul.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Coats, Jack
Sent: Wednesday 26 January 2005 17:16
To: ADSM-L AT VM.MARIST DOT EDU
Subject: How to get a tape drive to stream?


But does someone have a pointer to some 'tips & tricks' or FAQ to help
me get these LTO tape drives streaming with TSM on Windows 2000? 
  
The drives seem to be doing about 3MB/sec per drive, no matter what is
going on in the server.  This is about the right speed for stop/start
programmed I/O processing.

 

My config is TSM 4.3 on Windows 2K server (2 1.2G Xenon, 1G RAM)

My SCSI attached LTO-1 drives are on Adaptec controllers (IBM branded),
with two tape drives per controller.  I have 3 identical SCSI
controllers with two drives each (one also has my 3583 library on it).

 

Disks (6 72G 10K drives, in two partitions) are attached to one RAID
card, and are RAID 5.

 

I can't get just running a single tape drive streaming, with nothing
going on in my system (db backup only,  no backups, no reclamation, no
expiration, etc)

 

Any advice/suggestions are appreciated. ...

 

... Desperate in Houston ... JC



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