Veritas-bu

[Veritas-bu] SDLT320 speeds

2003-03-10 17:57:59
Subject: [Veritas-bu] SDLT320 speeds
From: ag.ram AT quantum DOT com (Ram Ramachandran)
Date: Mon, 10 Mar 2003 15:57:59 -0700
Backing up system files will be slower than backing up data files. I saw an
earlier posting from you asking about the st.conf file. Did you end up using
the SDLT entry in the file? I have also heard that you do not need to use
the entries, but have ended up using the same anyway.

Entries in the NUMBER_DATA_BUFFERS, etc., do play a critical part in your
throughput rate and it becomes a trial-and-error exercise with these values.
But you can start with the foll. as the baseline:

NUMBER_DATA_BUFFERS=32
NET_BUFFER_SZ=65536
SIZE_DATA_BUFFERS=65536

Hope this helps.

Ram

-----Original Message-----
From: Fernandes, Eustace [mailto:EFernandes AT talisman-energy DOT com]
Sent: Monday, March 10, 2003 11:49 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] SDLT320 speeds


Any ideas 
Solaris 7 Netbackup 3.4, latest st.conf patch from SUN.
SDLT320 and speeds are less than  8 meg/sec, sustained 5meg/sec.
I am using  cbn for the drive definitions.
Tar on the local drive gives me 8meg/sec sustained
Any relation to entries in the st.conf ...or NUMBER_DATA_BUFFERS ...etc...?

Backing up local attached disk drive on a test SUN server v880, Solaris 9,
Netbackup 4.5, patched _2 and latest Solaris st.conf patch
also gives me the same results  8meg/sec using a SDLT320 drive.

 Eustace Fernandes
Technical Support
 <mailto:efernandes AT talisman-energy DOT com>
voice (403) 237-1534



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