Originally posted by: tkidd

I am planning to create a volume group in AIX 6.1 with mutiple physical volumes. The pv sizes are all different sizes. They range in size from 2GB to 650GB. Since the pv's are sized differently, will it be a problem to have them all in one volume group? Is there a best practice? Thanks in advance, Ted

Originally posted by: as755

system administrators can configure upto 32PVs 255LVs in Normal VGs, 128PVs 511LVs in BIG VGs, and 1024PVs 4095LVs in Scalable VGs

Originally posted by: SystemAdmin

Hello,

Yes, you can create vg with different sized PVs.but as you stated "PVs size vary from 2Gb to 650Gb" you have plan accordingly the PPsize and you may have to T-factor to increase max. no. PPs/PV

Originally posted by: niella

There are no real issues in having mixed LUN sizes, as long as the largest LUN fulfills the basic sizing requirement of (MAX PPs per PV * PP Size).

However, afaik using large LUN sizes (like 600GB) may have other undesirable effects. Depending on the disk queue depth and overall activity you may run into problems such as the service queue filling up due to I/O queueing at the logical disk layer and whether this will be a problem obviously depends on what the system is used for.

You can check if this is the case by running 'iostat -D' and monitoring sqfull.

Niel