Jon Nelson wrote:
That, for me, is the next question - how can one educate LVM about the
underlying block device such that logical volumes carved out of that
space align properly - many of us have experienced 30% (or so)
performance losses for the convenience of LVM (and mighty convenient
it is).
When you do pvcreate you can specify --metadatasize. It will add padding
just to hit next 64K boundary.
So i.e. if you do
#pvcreate --metadatasize 256K /dev/sda
your metadata will have 320K
but with
#pvcreate --metadatasize 255K /dev/sda
it will have 256K
After that, lvm extents will follow - with the size specified during
vgcreate. Also I tend to use rather large sized extents (512M), as I
don't really need the granularity offered by the default 4M.
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