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тАО08-22-2000 12:58 PM
тАО08-22-2000 12:58 PM
AIO thresholds how to monitor?
We are having horrible stability issues, our AIO kernel parms are all at defults.
How can I tell just how close to AIO_MAX_OPS or AIO_ASYNC_PORTS AIO_PHYSMEM_PCT is to the threshold values? The vendor is saying "ah, just kick them up 50%" I don't like that approach, I want to know what is happening in the system.
I have mesaureware/glance/perfview, but don't see where those parms in there, don't know if that metric is tracked.
Any help would be appreciated...
Thanks.
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тАО08-22-2000 01:04 PM
тАО08-22-2000 01:04 PM
Re: AIO thresholds how to monitor?
Document #KBAN00000163 has lots of information on async I/O. Perhaps this will help you.
...JRF...
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тАО08-22-2000 01:34 PM
тАО08-22-2000 01:34 PM
Re: AIO thresholds how to monitor?
don't know the answer...but
if you have perfview, found out from HP that
"repinfo -s hostname -mwa | grep -i key-word"
will help you find what metrics are available and their correct syntax
"repinfo -s hostA -mwa | grep -i tbl" will show all the metrics available from various data sources that have a "tbl" in its name. This is on hpux 10.20, measureware c.2.10
the later versions (c.2.40) have more metrics available
version info is via "perfstat -v"
I did a "repinfo -s hostA -mwa | grep -i raw" - not sure if those metrics correspond with Asynchronous I/O...(/dev/rdsk/cxtxdx)
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тАО08-23-2000 07:05 AM
тАО08-23-2000 07:05 AM
Re: AIO thresholds how to monitor?
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тАО08-23-2000 12:28 PM
тАО08-23-2000 12:28 PM
Re: AIO thresholds how to monitor?
i've attached it anyways
the repinfo | grep -i will sort of work if you know what keyword to search on...
I tried searching on "raw" but don't know if it relates.
here's another idea: you can setup "applications" for glance to watch
via the /var/opt/perf/parm file
you specify application = label
file = *.dbf or something like that.. there are other keys to use besides "file"
if it's an application you're monitoring, maybe this is one approach..
it appears to group the related processes on the same page/display with CPU info & disk info...
If the application you're using can supply the metric info, then you could use "dsi data integration" to make that data available to measureware/perfview and alarmgen...which is cool. there's a whitepaper on it. www.openview.hp.com/library/ click on papers link - there's a good one about glance in advisor only mode...
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тАО08-23-2000 01:45 PM
тАО08-23-2000 01:45 PM
Re: AIO thresholds how to monitor?
Informix is the application, there's some indication "errno=11" that we should probably increase aio_max_ops, but only because we're getting errors do I see that, there's no way within HPUX (that I've found), to be proactive, and adjust upward when needed.
Anyway, thanks for your help, and I'll look into your other ideas in your second post.