Reduce PP size in rootvg

[vtaixer]

I have 146gb pvs for rootvg w/ 256mb pp size. Is there a way to reduce the pp size? I've tried chpv -t 3 rootvg. It allows me more pps/vg but the pp size stays the same.

TIA!

 

[unixfreak]

No, you can't change that.

Cheers

 

[Chapter11]

PP size is specified when you create a volume group. As far as I know, it's impossible to change PP size after a VG is created.

Since it happens to be rootvg, it's impossible to change that value without reinstalling (or mksysb'ing) the OS, and when you do that, you don't get the option of specifying PP size when rootvg is created - PP size is calculated by the installation routine to use as much of the specified disk(s) as possible and keep under the 1016 (or whatever) PP's per PV limit.

 

[Yegolev]

well i assumed i was going to have to do this as part of an install, changing the info in the mksysb via image.data manipulation. if you are talking about doing this on a existing system... i don't think so. but let me know how that goes. =)

i have had numerous troubles with cloning LPARs with 32GB disks onto "normal" rs6k with 8GB disks, mostly because hd6 on the LPAR is larger than the target disk on the old machine. i got this to work once or twice but it's a lot of damn work. i don't think i tried changing PP size, but it was a long night so who knows.

IBM Certified -- AIX 4.3 Obfuscation

 

[McleanWJM]

hm, You could use the alt_disk_isntall if you had a mirrored rootvg. Just make sure to run it staggared and alter the new Vg's PP size, then restore a mkssyb to it and wake it and boot, If all goes well youll have a new PP size for your Rootvg and can wipe the old one.

 

[shineboy]

1-create image.data file w/mkszfile
2-edit /image.data, change ppsize in vg_data stanza
3-create mksysb WITHOUT generating new image.data (mksysb /dev/rmt0 or whatever. in smit say NO to "generate new image file" question
4-restore mksysb image