Dne 30.9.2015 v 17:28 Timofey Koolin napsal(a):
Task: calc usable space of PV before create PV and before create partition for
PV.
In my experiments usable space in PV = PVSize / ExtentSize * ExtentSize with
integer operations.
But when Metadata may be large - when LVM have a lot of logical volumes and it
can take more space.
I found in /etc/lvm/lvm.conf parameter pvmetadatasize = 255 secotors (default).
What will if metadata will grow to more then 255 sectors?
If you plan to host lots of LVs within a single VG (in range of hundreds)
use i.e. 'pvcreate --metadatasize 5M'
(i.e. ~7000 linear single segment LVs takes around 2.2MB and you need space
for at least 2 metadatas to fit in)
What I'm not quite sure is your 'task' - what's the purpose ?
Do you want to do some 'sector' precise emulation of what lvm2 is doing by
watching resuls of couple command with just subset of it's options ?
Isn't better to read man pages ?
Zdenek
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