Networker

Re: [Networker] Slow tape positioning on HP LTO 1

2003-10-21 08:41:49
Subject: Re: [Networker] Slow tape positioning on HP LTO 1
From: James Edwards <jedwards AT SOS.STATE.TX DOT US>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Tue, 21 Oct 2003 07:38:40 -0500
I made the changes to the st.conf suggested on the Legato Knowledge base and
the block errors went away.  However, I am seeing the same behavior as
mentioned below.  A restore that took over 10 minutes to position the tape
before the changes took about 1 minute afterwards.  My st.conf entry is
slightly different at the end.  Mine is 0x40, 3;

I'm happy with the performance I'm getting now but would certainly increase
it if someone comes up with a way to do it.

Jim E

-----Original Message-----
From: Bob Payne [mailto:bob_payne AT FWUK.FWC DOT COM]
Sent: Tuesday, October 21, 2003 1:54 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Slow tape positioning on HP LTO 1


We also suffer slow tape positioning on recoveries....but not always! We've
had a call open with Legato for a year now. Our environment...Solaris 8
(kernel patch 108528-15....OK ,we're a little behind, st patch 108725-13),
Networker 6.1.2, HP LTO 1 drives in a STK L700e.
When it takes a while to position, I've noticed that the moving forward of
files is quick enough, but moving forward records takes the time and it
reports it in this way....moving forward 1917 records, moving forward 1440
records, moving forward 1071 records... and so on, the numbers gradually
getting smaller.
Snip from st.conf....
LTO_Ultrium = 1,0x3b,0,0x1d639,4,0x00,0x00,0x00,0x00,3;
Anybody any thoughts?
Bob

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