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Re: [linux-lvm] changing pe size



i have looked around the net and not found much info about this...

so i spent time experimenting...

i have a centos 5 system with a 32m pe size vg and have attached some
storage with an lvm1 4m pe size vg.  i converted the old vg to lvm2
without problem, but i would like to merge the volumes and pvmove data
onto the newer 32m pe pvs.  but you can't merge things with different pe
size, so i've been trying to get the 4m pe vg changed to 32m pe.  after
much monkeying around i was able to get all the pvs and lvs to have le
counts that were the right size to be convertible to 32m pe.  but it
looks like each segment must be sized appropriately and i can't find a
way to merge segments together so that things are sized correctly.

it turns out that pvmove will coalesce adjecent segments. so i was able to use a series of pvmoves to get all my segments to be contiguous and a mulitple of the new pe size i wanted.

once i did that, then vgchange -s worked just fine.


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