[gpfsug-discuss] How to find which node is generating high iops in a GPFS 3.5

IBM Spectrum Scale scale at us.ibm.com
Tue Sep 19 07:54:50 BST 2017


Hi Richard,

Is any of tool in
https://www.ibm.com/developerworks/community/wikis/home?_escaped_fragment_=/wiki/General%2520Parallel%2520File%2520System%2520%2528GPFS%2529/page/Display%2520per%2520node%2520IO%2520statstics
 can help you?

BTW, I agree with Bob that 3.5 is out-of-service. Without an extended
service, you should consider to upgrade your cluster as soon as possible.

Regards, The Spectrum Scale (GPFS) team

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From:	"Oesterlin, Robert" <Robert.Oesterlin at nuance.com>
To:	gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:	09/19/2017 03:28 AM
Subject:	Re: [gpfsug-discuss] How to find which node is generating high
            iops in a GPFS 3.5
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



You do realize 3.5 is out of service, correct? You should be looking at
upgrading :-)

Catching this is real time, when you have a large number of nodes is going
to be tough. How you recognizing that the file system is overloaded?
Waiters? Looking at which nodes/NSDs have the longest/largest waiters may
provide a clue.

You might also take a look at mmpmon – it’s a bit difficult to use in its
raw state, but it does provide some good stats on a per file system basis.
But you need to track these over times to get what you need.

Bob Oesterlin
Sr Principal Storage Engineer, Nuance


From: <gpfsug-discuss-bounces at spectrumscale.org> on behalf of Richard
Lefebvre <richard.lefebvre+gpfsug at calculquebec.ca>
Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date: Monday, September 18, 2017 at 2:18 PM
To: gpfsug <gpfsug-discuss at spectrumscale.org>
Subject: [EXTERNAL] [gpfsug-discuss] How to find which node is generating
high iops in a GPFS 3.5

Hi I have a 3.5 GPFS system with 700+ nodes. I sometime have nodes that
generate a lot of iops on the large file system but I cannot find the right
tool to find which node is the source. I'm guessing under 4.2.X, there are
now easy tools, but what can be done under GPFS 3.5.
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