Question about mounting lv in an lvm storage pool

LXD
,
#1

Hi,
I am trying to mount an lvm based volume:

mother@infra2:~$ lxc storage volume create local-lvm backups size=25GiB
Storage volume backups created
mother@infra2:~$ sudo lvdisplay | grep backups
  LV Path                /dev/storage2-vg/custom_default_backups
  LV Name                custom_default_backups
  LV Path                /dev/lxcstore-vg/custom_default_backups
  LV Name                custom_default_backups
mother@infra2:~$ sudo mount /dev/lxcstore-vg/custom_default_backups /backups
mount: /backups: special device /dev/lxcstore-vg/custom_default_backups does not exist.

SImilar command works on another lxd host where there is no clustering, what did I do wrong?

#2

Please can you show “sudo lvs” output?

I suspect you need to activate the volume before it appears aa a device.

#3 
mother@infra2:~$ sudo -i
root@infra2:~# lxc storage volume create remote-lvm recovery size=50GiB
Storage volume recovery created
root@infra2:~# sudo lvs | grep recovery
  custom_default_recovery                                                             storage2-vg Vwi---tz-k   50.00g lvm-pool                                                                                  
root@infra2:~# sudo lvs | grep recovery -A 20
  custom_default_recovery                                                             storage2-vg Vwi---tz-k   50.00g lvm-pool                                                                                  
  images_1c15b72dcd63d3a91b6a198a052de015e5d5ea09be7d17f237155904c4e7b8d0             storage2-vg Vwi---tz-k   10.00g lvm-pool                                                                                  
  images_21e6855cea66108ce49354f7efa012c1d94c7ff11adc7c31cfd4f23bb367b51c             storage2-vg Vwi---tz-k   10.00g lvm-pool                                                                                  
  images_48fba1296bd536c098c69fbbc72ed7d27eb5d0f259b16d0f17f390e8beeda06d             storage2-vg Vwi---tz-k  100.00m lvm-pool                                                                                  
  images_48fba1296bd536c098c69fbbc72ed7d27eb5d0f259b16d0f17f390e8beeda06d.block       storage2-vg Vwi---tz-k   10.00g lvm-pool

@tomp do you mean any particular command?

Ithink I should add the fact that I am running on a 3 member cluster, in the documentation I see

To add a custom storage volume on a cluster member, add the --target flag:

lxc storage volume create <pool_name> <volume_name> --target=<cluster_member> [configuration_options...]

62
root@infra2:~# lvdisplay  /dev/storage2-vg/custom_default_recovery
  --- Logical volume ---
  LV Path                /dev/storage2-vg/custom_default_recovery
  LV Name                custom_default_recovery
  VG Name                storage2-vg
  LV UUID                LscXd6-VI1N-1fIO-f9i7-Qg8s-Vi32-Ba8GIv
  LV Write Access        read/write
  LV Creation host, time infra2, 2023-02-08 16:06:48 +0000
  LV Pool name           lvm-pool
  LV Status              NOT available
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
#4

So LXD only activates the logical volumes when it needs to mount the volume, this is so we don’t keep unnecessary devices active in the system.

You can manually activate using:

sudo lvchange --activate y --ignoreactivationskip /dev/storage2-vg/custom_default_recovery

And then when you’re done, after unmounting, do

sudo lvchange --activate n --ignoreactivationskip /dev/storage2-vg/custom_default_recovery
#5

Seems I was missing --ignoreactivationskip, thank you very much :slight_smile:

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