I saw something similar a good few years ago (ie on an older version of GPFS). IIRC the issue was one of contention: one or two served nodes were streaming IOs to/from the NSD servers and as a result other nodes were exhibiting insane IO times. Can't be more helpful though, I no longer have access to the system.
Regards, J Martin Rushton MBCS On 04/10/18 20:54, Buterbaugh, Kevin L wrote: > Hi All, > > What does it mean if I have a few dozen very long I/O’s (50 - 75 > seconds) on a gateway as reported by “mmdiag —iohist” and they all > reference two of my eight NSD servers… > > … but then I go to those 2 NSD servers and I don’t see any long I/O’s > at all? > > In other words, if the problem (this time) were the backend storage, I > should see long I/O’s on the NSD servers, right? > > I’m thinking this indicates that there is some sort of problem with > either the client gateway itself or the network in between the gateway > and the NSD server(s) … thoughts??? > > Thanks in advance… > > — > Kevin Buterbaugh - Senior System Administrator > Vanderbilt University - Advanced Computing Center for Research and > Education > [email protected] > <mailto:[email protected]> - (615)875-9633 > > > > > > _______________________________________________ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss
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