[gpfsug-discuss] mmdiag --iohist question
IBM Spectrum Scale
scale at us.ibm.com
Mon Jul 23 07:51:54 BST 2018
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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From: "Buterbaugh, Kevin L" <Kevin.Buterbaugh at Vanderbilt.Edu>
To: gpfsug main discussion list <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
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 - (615)875-9633
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