Re: [Networker] How fast are you getting on SDLT 320?

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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