From: "Tomas Dalebjörk" <tomas.dalebjork@gmail.com>
To: linux-lvm@redhat.com
Subject: [linux-lvm] vgcfgrestore + pvcreate using liblockdev api in C
Date: Mon, 14 Sep 2020 07:56:19 +0200 [thread overview]
Message-ID: <5CE72DC6-9948-4CB6-83E9-C1F2AE55D5DB@gmail.com> (raw)
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
next reply other threads:[~2020-09-14 5:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 5:56 Tomas Dalebjörk [this message]
2020-09-15 11:55 ` [linux-lvm] vgcfgrestore + pvcreate using liblockdev api in C Vojtěch Trefný
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