[gpfsug-discuss] mmdiag --iohist question

[Buterbaugh, Kevin L]

Hi GPFS team,

Yes, that’s what we see, too … thanks.

Kevin

—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and Education
Kevin.Buterbaugh at vanderbilt.edu<mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633

On Jul 23, 2018, at 1:51 AM, IBM Spectrum Scale <scale at us.ibm.com<mailto:scale at us.ibm.com>> wrote:


Hi

Please check the IO type before examining the IP address for the output of mmdiag --iohist. For the "lcl"(local) IO, the IP address is not necessary and we don't show it. Please check whether this is your case.

=== mmdiag: iohist ===

I/O history:

I/O start time RW Buf type disk:sectorNum nSec time ms Type Device/NSD ID NSD node
--------------- -- ----------- ----------------- ----- ------- ---- ------------------ ---------------
01:14:08.450177 R inode 6:189513568 8 4.920 srv dm-4 192.168.116.92
01:14:08.450448 R inode 6:189513664 8 4.968 srv dm-4 192.168.116.92
01:14:08.475689 R inode 6:189428264 8 0.230 srv dm-4 192.168.116.92
01:14:08.983587 W logData 4:30686784 8 0.216 lcl dm-0
01:14:08.983601 W logData 3:25468480 8 0.197 lcl dm-8
01:14:08.983961 W inode 2:188808504 8 0.142 lcl dm-11
01:14:08.984144 W inode 1:188808504 8 0.134 lcl dm-7



Regards, The Spectrum Scale (GPFS) team

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<graycol.gif>"Buterbaugh, Kevin L" ---07/11/2018 10:34:32 PM---Hi All, Quick question about “mmdiag —iohist” that is not documented in the man page … what does it

From: "Buterbaugh, Kevin L" <Kevin.Buterbaugh at Vanderbilt.Edu<mailto:Kevin.Buterbaugh at Vanderbilt.Edu>>
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org<mailto:gpfsug-discuss at spectrumscale.org>>
Date: 07/11/2018 10:34 PM
Subject: [gpfsug-discuss] mmdiag --iohist question
Sent by: gpfsug-discuss-bounces at spectrumscale.org<mailto:gpfsug-discuss-bounces at spectrumscale.org>

________________________________



Hi All,

Quick question about “mmdiag —iohist” that is not documented in the man page … what does it mean if the client IP address field is blank? That the NSD server itself issued the I/O? Or ???

This only happens occasionally … and the way I discovered it was that our Python script that takes “mmdiag —iohist” output, looks up the client IP for any waits above the threshold, converts that to a hostname, and queries SLURM for whose jobs are on that client started occasionally throwing an exception … and when I started looking at the “mmdiag —iohist” output itself I do see times when there is no client IP address listed for a I/O wait.

Thanks…

Kevin

—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and Education
Kevin.Buterbaugh at vanderbilt.edu<mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633


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