LVM setup on DPX vPlus Node for disk attachment backup mode

Note: This is required for backup of virtual environments when using disk attachment mode, such as Nutanix backups.

DPX vPlus Node attaches VM disks that potentially are clones of its own (for example if Node deployed from the template) - you need to configure LVM on the Node so that it doesn't scan for LVM volumes where disks are being attached.

1. Set the following variables in /etc/lvm/lvm.conf in devices section - so that only system volumes are being detected by LVM daemon (in this example sda disk with 2 partitions - sda1 and sda2):

   devices {
            filter = [ "a|^/dev/sda|", "a|^/dev/sda1|", "a|^/dev/sda2|", "r|.*|" ]
            global_filter = [ "a|^/dev/sda|", "a|^/dev/sda1|", "a|^/dev/sda2|", "r|.*|" ]
   }
   

2. Check with vgscan -vvv that your OS volumes are still being detected:

        Allocated VG vg_vprotect at 0x55914f19fac0.
        Importing logical volume vg_vprotect/lv_root.
        Importing logical volume vg_vprotect/lv_swap.

3. Reboot:

   reboot