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From: "Tomas Dalebjörk" <>
Subject: [linux-lvm] vgcfgrestore + pvcreate using liblockdev api in C
Date: Mon, 14 Sep 2020 07:56:19 +0200	[thread overview]
Message-ID: <> (raw)


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

             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 ` Vojtěch Trefný

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