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Outstanding I/O

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Mulder_1
Frequent Advisor

Outstanding I/O

Can anyone please tell me how to find outstanding I/O request?

thanks
6 REPLIES
Robert Gezelter
Honored Contributor

Re: Outstanding I/O

Mulder,

Welcome to the ITRC OpenVMS Forum!

Some additional details would be helpful.

The best way is to use ANALYZE/SYSTEM, but that is a tool that requires some knowledge.

If you can supply more details, perhaps there is a simpler method to find the information.

- Bob Gezelter, http://www.rlgsc.com
Volker Halle
Honored Contributor

Re: Outstanding I/O

Mulder,

determining from your 4 questions in ITRC today, you seem to have some kind of OpenVMS problem, which you attempt to diagnose.

Instead of asking (too) specific questions, please consider to describe the overall problem. Then we may be able to direct your research and analysis in the right direction...

Volker.
Mulder_1
Frequent Advisor

Re: Outstanding I/O

This has to do with a problem that occured which is a process which has gone into LEF state.No errors were reported.

Simply the process is waiting for some reason.
Hence,needs checking.

So,looking into the depth for answers.

Please let me know if some more info is required.

Thanks
Volker Halle
Honored Contributor
Solution

Re: Outstanding I/O

If this process is one of the standard OpenVMS processes, find out what the 'normal' wait state of the process is (most OpenVMS system processes wait in HIB). Being in LEF for an extended period of time can point to specfific problems - based on the process name. If so, tell us the process name.

If this is an application process, you might need to find out, in which part/routine/module of the application, the process is waiting.

You can show outstanding IOs with SDA. You can also show, which locks a process may be waiting for.

$ ANAL/SYS
SDA> SET PROC/IND=
SDA> SHOW PROC/CHAN
... look for busy IO channels
SDA> SHOW PROC/LOCK
... waiting locks will be displayed first
SDA> EXIT

Volker.
Hein van den Heuvel
Honored Contributor

Re: Outstanding I/O

If you don't mind digging deep rigt away...

ANAL/SYS
SDA> SET PROC /ID = xxx
SDA> SHOW PROC/CHAN
.... look for BUSY

SDA> SHOW PROC/LOCK
.... look for : "Waiting for "

Good luck!
Hein.
Mulder_1
Frequent Advisor

Re: Outstanding I/O

Thanks to all for the prompt replies.

The process name is ABH02.

It is an application process.

Volker is correct...it is one single problem which lead me to the other questions.

I think now I can get back to the application to find the problem.

Thanks again