It used to just be a "stats show -i <minutes>" but it may be something from the Java API now, I'm not sure. Stats show still works and can provide the same information, getting it to write out is a little confusing.
Frankly it's disappointing that NetApp has emphasized support on the thicker method for performance monitoring, SNMP + SSH worked well when you have dozens or more filers to handle. We don't have a common directory so creating a single local ID with a ssh key is much easier for us from a management point of view.
Too bad Ontap's command line makes AIX look good :-(
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From: Fred Grieco [mailto:fredgrieco@yahoo.com] Sent: Monday, January 31, 2011 12:51 PM To: Page, Jeremy; toasters@mathworks.com Subject: Re: latency measurement in DFM/Management Console/etc
Thanks, this makes sense. But...
The graph seems to roll along at 1 minute intervals. This is in "Management Console" which I assume is also called Performance Advisor. The default interval for this in DFM though is 5 minutes (perfAdvisorPollInterval). Is there some other setting for this?
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From: "Page, Jeremy" jeremy.page@gilbarco.com To: Fred Grieco fredgrieco@yahoo.com; toasters@mathworks.com Sent: Mon, January 31, 2011 8:54:18 AM Subject: RE: latency measurement in DFM/Management Console/etc
Frequently this is from too short of a sample period.
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From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Fred Grieco Sent: Monday, January 31, 2011 8:44 AM To: toasters@mathworks.com Subject: latency measurement in DFM/Management Console/etc
How does the Netapp or DFM measure volume and lun latency? Does it just measure how long it's taking to service requests from the back ports to the front ports? Or does it measure some sort of fibre ping to the host?
I am looking in the management console in DFM/Ops Mgr and seeing spikes of very high volume and lun latency (seconds...) on an N-Series IBM gateway filer. I've looked at all the usual suspects, including misaligned VMs, high correlated IOPs, delays on the backend disk, deferred consistency points. Nothing is matching up. Most of the connected systems are on a Cisco UCS with NPIV. The systems with the lowest IOs have the highest latency numbers.
Thoughts?
TIA,
Fred
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