How are you getting that rate? Are you on a gig network? I have hardware
compression turned on only.
Alan Skinner
Network Administrator
Research, Analysis & Maintenance, Inc.
609-562-6039
<alan.skinner AT dix.army DOT mil>
-----Original Message-----
From: John Stoffel [mailto:john.stoffel AT taec.toshiba DOT com]
Sent: Friday, June 03, 2005 5:19 PM
To: Legato NetWorker discussion; Skinner,Alan C(Contractor)
Subject: Re: How fast are you getting on SDLT 320?
Alan> I just had Quantum set up two SDLT 320's in an M2500 tape library.
Alan> The tech told me they were only good for 16 MB/s each. I am only
Alan> getting about 8 or 9 MB/s together. My server is running Windows
Alan> 2003 with the tape library connected by fiber channel, running
Alan> networker 7.1. on a switched network with server and clients all
Alan> with 100mb nic cards. My switch and router guys are monitoring the
Alan> ports and seeing 60 and 70 mb/s going to the server. I have the
Alan> server Parallism set at 6, the two tape devices have target
Alan> sessions at 4 and the client Parallelism at 4. I see some
Alan> conversation out there about compression. I am not sure what to do
Alan> there? Help....Looking for the bottleneck!!!!!
We've got a similar setup, and we're seeing more along the lines of
25-35mb/s to our SDLT320 drives. That's with compression turned on, so the
tech is right, the raw speed to tape is probably just 16mb/s, but I'm not
sure.
100mbit/s network (100baseT) can only push 12.5Mbyte/sec max, and you will
never see that rate, 10Mbytes/sec would be considered great.
In any case, I'd up the server parallelism to 16 or more, and the tape
drives to 8 each. Leave the client parallelism along for now.
John
John Stoffel - Senior Staff Systems Administrator - System LSI Group
Toshiba America Electronic Components, Inc. - http://www.toshiba.com/taec
john.stoffel AT taec.toshiba DOT com - 508-486-1087
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