Re: [Veritas-bu] DSSU destaging performance?
2007-11-30 07:36:49
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
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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