We're looking at a storage frame migration and considering which
methods to use. We have LUNs as PVs in LVM, with one or more LVs
defined for each volume group. What is best practice to move to new
sets of luns?
Some methods which come to mind are ...
rsync (of filesystem content)
dd (of LVs or of PVs)
LVM PV mirroring
LVM PV add/delete migration
tar (of filesystem content)
If we can take the filesystems down, then 'rsync' would be preferred.
(It doesn't copy unused sections of the disk.) But it was suggested
that we might have less downtime if we use PV mirroring or even simply
add the new PVs and delete the old (and let LVM migrate the extents).
There's a huge unknown with both of the LVM tricks as far as the CPU
required (as Linux does the work automagically).
Thoughts?
Thanks.
-- R; <><
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