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IO queue maxtime over 1 minute

 
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Operating Systems AIX IO queue maxtime over 1 minute
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Old 01-06-2018
you don't show all the errors. SC_DISK_ERRs, you see, are SCSI timeout. They can be caused by SAN bottlenecks (such as lack of buffers) as well as by AIX settings. Storage device can cause such problems too. The easiest (and I think the fastest) way to solve the problem is to open a PerfPMR at IBM. You have IBM server, IBM operating system and IBM storage. They're interested in solving the problem as fast as possible.

If you'd like to analyze the problem further, you must first provide the information about the operating system and the storage.

  • which version do you have? oslevel -s
  • which version of storage drivers?
  • settings of the FC adapters? (for i in $(lsdev -l fcs* -F name) ; do echo $i ; lsattr -El $i ; lscfg -l $i; done
  • settings of FSCSI devices? lsattr -El fscsiX
  • Output of fcstat command for each FC HBA
  • full errpt output, because you provided just a short excerpt


It is just a small amount of questions I can remember after celebrating russian Christmas. IBM will ask more questions for sure, and will ask to run some scripts to gather the necessary information.

Moderator's Comments:
Mod Comment edit by bakunin: surrounded commands with ICODE-tags. Please use them for code-snippets so that they stand out better. Thank you!
Last edited by bakunin; 01-08-2018 at 09:59 AM..
 
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