filesystem full can mak a lot of paging?

[MoreFeo]

Hi, we're habing some trouble in a 570 LPAR. Some logs have filled the /var filesystem, and we're seeing a lot of paging. Can a process that usually writes to disk start paging if it runs out of space in its filesystem?

Thanks

 

[p5wizard]

Where exactly is /var filling?

cd /var
du -ks * | sort -n

And then dig deeper into the directories that are using the most disk space and continue the du -ks | sort -n command.

Also: is qdaemon still running? That can account for a lot of space used in /var/spool and also for a lot of processes waiting for a response from qdaemon... Which would explain the paging activity.



HTH,

p5wizard

 

[MoreFeo]

I've made du and I've seen that there's a log directory that has grown until it filled the filesystem. Inside there are a lot tracing logs from a process that's logging too much events (we're gonna fix this). My question is that if a process that has to write logs on disk has got no space in disk, will it start using a lot of paging space (we had more than 67% of a 10 GB paging space used).

Thanks

 

[p5wizard]

My question is that if a process that has to write logs on disk has got no space in disk, will it start using a lot of paging space (we had more than 67% of a 10 GB paging space used).

I don't think so.

I'd start with topas or ps -el to find out which processes are consuming a lot of memory and go from there.


HTH,

p5wizard

 

[mbourne2006]

If you want to know about paging on a process by process basis, take a look at the output from "ps gv". The "PGIN" field will display the number of disk I/O operations caused by the process referencing pages that are not held in core.

HTH

Kind Regards,
Matthew Bourne
"Find a job you love and never do a day's work in your life.

 

[MoreFeo]

With 'ps gv' I've found a lot of aioserver (ir 38 is a lot of) and that they are the processes that have more PGIN (between 90000 and 175000). These aioserver processes doesn't show in topas nor in ps -ef.

 

[MoreFeo]

And we're now having almost all paging space filled (93% of 10GB and 100% of 4 GB)

 

[MoreFeo]

OK, we've found the problem. It's not the aioserver process, it was a data source collector, that retrieves data for 20 minutes before writing it to the database. We're going to monitor it and try to tune it.