Very Computer

Hello Everyone,

I am running PDT on my AIX 4.3.3 boxes, and getting some reports back
with the following messages:

  VIRTUAL MEMORY
   -  VMM has identified 49 bad frames

  -  Paging space hd6 on volume group rootvg is fragmented

What does the "49 bad frames" message refer to, and what corrective
action can I take?

And how can I un-fragment a paging space?  Can I use defragfs, and can
I do it with the system running.

Thanks for the info,

Scott

It seems the only way to defrag the paging space is a reboot. On
recommendation of IBM we reboot our servers once a week to address the
paging space growth issue. Best is to see how it grows by using lsps -s and
set a reboot frequency according to the results.obtained over a period of
time.

Any other suggestions anyone?

Quote:> Hello Everyone,

> I am running PDT on my AIX 4.3.3 boxes, and getting some reports back
> with the following messages:

>   VIRTUAL MEMORY
>    -  VMM has identified 49 bad frames

>   -  Paging space hd6 on volume group rootvg is fragmented

> What does the "49 bad frames" message refer to, and what corrective
> action can I take?

> And how can I un-fragment a paging space?  Can I use defragfs, and can
> I do it with the system running.

> Thanks for the info,

> Scott

Quote:> It seems the only way to defrag the paging space is a reboot. On
> recommendation of IBM we reboot our servers once a week to address the
> paging space growth issue. Best is to see how it grows by using lsps -s
and
> set a reboot frequency according to the results.obtained over a period of
> time.

> Any other suggestions anyone?

Yes, find the program that is eating up memory.  Get the vendor to fix it.
If it's not a program, it's the OS, so get IBM to fix it.

man pdtreport ?

Quote:> > And how can I un-fragment a paging space?  Can I use defragfs, and can
> > I do it with the system running.

#1 - The paging space is not a filesystem.
#2 - It means that hd6 is fragmented at the LVM level (i.e. LP's scattered
        instead of contiguous).
so reorgvg

Also:
-  Never have more than one paging space per disk.
-  A paging space should be made of contiguous PP's.
-  If you have a VG with two paging spaces (one on each disk) and
   decide to mirror the vg, don't forget to remove one of the paging spaces.

--
Doing AIX support was the most monty-pythonesque
activity available at the time.