Issue about PP size

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http://www.unix.com – Hello everyone, I have many VGs on my system. I have created them whith the same command. I haven't specified the PP size while creating them. Logically, the PP size should be the same (default value) in all the VGs. However, I have different PP size : 32 MB, 256 MB, 64 MB and 128 MB. Can anyone explain why I haven't the same PP size ? what's the PP size default value ? What's the utility of having small PP size rather than big PP size ? Thank you (HowTos)