Changing paging space 1

[AlbertAguirre]

I ran the AIX PDT report and got the following:

- Physical Volume hdisk1 (type: SCSI) has no paging space defined
- All paging spaces have been defined on one Physical volume (hdisk0)
- Paging space hd6 on volume group rootvg is fragmented

Any advice before I change paging space configuration?
Anything I should be careful about?

 

[kHz]

Mirror paging.

Don't worry about the fragmentation note. You cannot defrag paging space (obviously).

 

[AlbertAguirre]

Thanx for your response.
I have a question though, why should I use mirror paging?

I was planning on defining a second pageing space on a less busy volume. Why should I mirror?
I guess I dont understand mirroring well enough.

 

[kHz]

You should mirror your rootvg paging (hd6) because if you lose hdisk0 and rootvg is mirrored to hdisk1 (without paging mirrored) then wham-o, everything is gone. But if you lose hdisk0 and paging is mirrored to hdisk1, then you can continue working as though nothing happened.

 

[AlbertAguirre]

i am researching mirroring now. Thanx for the advice kHz

Any tips before I do it?

 

[kHz]

Just mirror it like any lv.

 

[AlbertAguirre]

Well I found out it was mirrored already.

I did try to create a new swap space because there was only 1 (default on hd6) plus the mirror, but when I try to activate it smit doesnt return control to me. Just looks like it freezes

ANy ideaS?

 

[kHz]

No idea why smit would lock up. Are there any errors on the disk you are trying to create the paging space? Are you creating the disk on internal SCSI, external EMC or Shark? Remember to keep your paging space size equal in size. Don't have hd6 be 2048 and you create one of 8192 because paging uses the round robin method. And don't over-allocate paging space because it can impact your system more negatively more than help it positively.