Re: [Veritas-bu] DSSU destaging performance?

From my bptm logs (using the term "copy 2" for destaging processes). I only do performance type queries on streams larger than 1GB.

size                  speed
      2,064,416         Kbytes at           156,859    Kbytes/sec
      2,846,944         Kbytes at           141,879    Kbytes/sec
      2,864,206         Kbytes at           130,381    Kbytes/sec
      1,406,432         Kbytes at           125,496    Kbytes/sec
      1,406,432         Kbytes at           116,736    Kbytes/sec
      8,000,000         Kbytes at           110,228    Kbytes/sec
      8,000,000         Kbytes at             99,475 Kbytes/sec
      3,072,032         Kbytes at             89,119 Kbytes/sec
      1,043,516         Kbytes at             81,340 Kbytes/sec

System Model: IBM,9110-51A
Machine Serial Number: 0685B1F
Processor Type: PowerPC_POWER5
Number Of Processors: 4 (8 logical)
Processor Clock Speed: 1648 MHz
CPU Type: 64-bit
Kernel Type: 64-bit
LPAR Info: 1 06-85B1F
Memory Size: 7936 MB

AIX 5.3
NetBackup 5.0MP7

fiber attached LTO-3 IBM drives in an IBM library. All Fiber ports/sfp's are 4GB.

Bobby Williams
2205 Peterson Drive
Chattanooga, Tennessee 37421
423-296-8200

From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Ed Wilts
Sent: Thursday, November 29, 2007 4:18 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] DSSU destaging performance?

An LTO-3 drive needs to run at least 23MB/sec native and preferably over 80MB native (before compression). We’re having difficulties consistently getting over 30 – and frequently get a lot lower – from our Solaris master server to our tape drives with NetBackup 6.0MP5. Our media servers aren’t great either but they’re going over ISLs although the ISLs aren’t saturated (I’m trying to take them out of the picture for to eliminate the ISLs as a potential culprit). Are other people getting consistently better de-stage performance? I’m trying to determine if what we’ve got is unique to us or a more global issue. Symantec has been trying to help for over a year but we haven’t been able to get our performance up to an acceptable level yet.

If you’re getting great performance, please drop me an email and let me know what your config is.

Thanks,

…/Ed

Ed Wilts, RHCE, BCFP, BCSD

Mounds View, MN, USA

mailto:ewilts AT ewilts DOT org

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