[linux-lvm] vgcfgrestore + pvcreate using liblockdev api in C
Tomas Dalebjörk
tomas.dalebjork at gmail.com
Mon Sep 14 05:56:19 UTC 2020
hi
Is there an api available today or an example how to perform the below OS commands in C using a function or api instead of system calls?
1. create an unique uid on the server, and store it on the PV disk
# pvcreatue -u <generated uid> <your device>
2. create the LVM metadata backup content (as /etc/lvm/backup/...)
- add PV uid generated above as there is no parameter to save the data to a device
- add unique VG
- add exactly 1 contiguous LV
3. save LVM metadata to the PV disk as the OS command does
# vgcfgrestore VG
Can this be done by instead of using system() calls, instead using native C commands either via an API or other methods?
the examples for bd_lvm_pvcreate() in libblockdevapi for example does not say how to add -u flag
and I couldn’t find any vgcfgrestore there too?
besides this, I found it strange why pvcreate -u is needed at all? would be better to have a <dev> parameter directly to the vgcfgrestore command instead
looking forward to hearing from you soon again
regards Tomas
Sent from my iPhone
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