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тАО09-26-2003 09:07 AM
тАО09-26-2003 09:07 AM
average I/O size ?
We can obtain much I/O info from the Monitor utility, but how does one determine the average disk I/O size?
Thanks,
Charlie
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тАО09-28-2003 09:05 PM
тАО09-28-2003 09:05 PM
Re: average I/O size ?
Purely Personal Opinion
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тАО09-29-2003 02:55 AM
тАО09-29-2003 02:55 AM
Re: average I/O size ?
There really should be an MB/sec indicator somewhere in the standard tools no... but best I know there isn't. I would likely be maintained in the UCB (along with UCB$L_OPCNT), but I don't see it there. [ANAL/SYS... SHOW DEV DKxxx... READ IODEF ... FORMAT
Some performance tools (PSM, CA, PAWZ,... ?) will report this somehow.
Anyway, In 25 years of VMS performance work I have had very little use for it. The bottleneck has always been IO/sec, not MB/sec because the average IO size has always been low 4KB.
I believe theat the average IO size is drifting upwards 10KB? with RMS sequential
file buffers growing, RMS index file buckets being chosen larger, backups,... and I believe MB/sec can and will become an bottleneck.
It looks like the new and expanded SHOW MEMORY/CACHE/FULL also puts the focus on IO/sec. Hmmm... I'll ask the engineer over lunch for details.
You may be stuck using Hardware Monitor tools like VTDPY on the HSZ to get the KB/io numbers.
Cheers,
Hein.
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тАО09-29-2003 08:09 AM
тАО09-29-2003 08:09 AM
Re: average I/O size ?
Actually, while the base VMS does not keep track of IO sizes, the XFC does a great job in this space.
Check out
HELP SHOW MEM /CACHE
SHOW MEM/CACHE/FULL
SHOW MEM/CACHE/VOL=xxx
You'll even find nice histograms!
Hein
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тАО09-30-2003 12:45 AM
тАО09-30-2003 12:45 AM
Re: average I/O size ?
ANALYZE /SYSTEM
(invokes the System Dump Analyzer SDA)
then see command SHOW.
Bruno
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тАО12-01-2003 04:16 PM
тАО12-01-2003 04:16 PM
Re: average I/O size ?
There is a Windows analysis program (I think also written by Ken Bates) which can take the output of a long run of DSTAT and give you some meaningful stats. If your support staff won't send it to you, I can, but it's too big to post here.