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Tags: clvm,howto
Date: 20260401
Updated: 20260401
Quick and dirty tutorial on how to setup "CLVM" with lvmlockd and sanlock on EL9, but probably same applies to most/all distros.
Assuming 2 nodes on a shared block storage of sorts (fc, iscsi etc) as /dev/sdb, this is the procedure I would normally follow to get started with the $subject.
On both nodes:
dnf install lvm2-lockd sanlock -y
systemctl enable sanlock --now
systemctl enable lvmlockd --now
edit /etc/lvm/lvm.conf # make sure in the "global" section you have "use_lvmlockd = 1"
edit /etc/lvm/lvmlocal.conf # make sure in the "local" section you have a valid entry as the following, it needs to be a unique number per host: "host_id = 1" on node1 and "host_id = 2" on node2
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Just on one/first node initialize the shared disk /dev/sdb and start the VG in shared mode:
pvcreate /dev/sdb
vgcreate --shared --lock-type sanlock sharedvg /dev/sdb
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On the second node do:
lvmdevices --adddev /dev/sdb # adds the disk to /etc/lvm/devices/system.devices
vgchange --lockstart sharedvg # starts the VG in shared mode
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That's it, you can now start playing with creating LVs, locking
them, sharing them etc.