I'm experiencing a similar problem with Red Hat 7.3.  When I moved from
a linux client (Ethernet backup) to SAN media server, the speeds
actually decreased when backing up across the SAN.  I tend to think it
might have something to do with linux SCSI tape support, but I have
nothing to base that on whatsoever.

Where/how did you set the block size to 128K?


-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
Meyerowitz, Raphael
Sent: Thursday, February 05, 2004 12:38 PM
To: 'veritas-bu AT mailman.eng.auburn DOT edu'
Subject: [Veritas-bu] Linux Media servers

I have a Windows Master/Media server and 4 Linux red hat advance server
2.1
san media servers.  I cannot ge tthe san media servers to write as fast
as
te tape drivers can.    

I have worked with IBM to run some tests on these tape drives, and I
have
found that these drives do work at the expected speeds (28 mb/second)
under
Redhat with the current driver configuration, and 128kb block size
writing
to the tape.  We have not gotten anywhere near these speeds with
Netbackup,
even when we adjusted the buffer size to 128kb. Do you have any more
ideas
about

how to get these drives working at the proper speed? 

Raphael

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