Are there capacity issues with LVM2 on RAID?
I'm about to partition twin 3TB disks. Some free space (in case I need
it someday) outside the main partitions, and one main partition on each
of the two drives. These partitions will be twinned as parts of a RAID1
for redundancy. On that RAID I plan to install LVM2, and use that to
mnage partitions flexibly. Most of these partitions will be ext4.
Someday in the future, this will all migrate to larger disks, when
necessary.
I have a similar setup on much smaller disks at the moment. The obvious
way would be to add the new huge partitions to my existing RAID, wait
until they all get copies of the data, and then remove the old ones and
let the RAID expand.
But I gather that 2T is a critical boundary for fdisk, so I'll have to
use gparted instead, set up the RAID and LVM (I gather gparted won't do
LVM. Has this chaned?), create new ext4 partitions there, and copy old
data for new drives.
Are there such boundary issues with LVM? with software RAID? Should I
move to 48-bit or 64-bit block numbers? And if so, how to specify that?
I can probably figure out ways to get this all done, but I'd like to ask
about potential pitfalls before I start.
Are there other gotchas I need to know about? I'll probably be stuck
with my new setup for several years at least.
-- hendrik
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