[linux-lvm] vgcreate doesn't work with lvmlockd running

[Zhiyong Ye <yezhiyong@bytedance.com>]

Hi all,

I am new to lvm. When I was trying to create a shared VG (vgcreate
--shared <vg_name> /dev/sdb1 /dev/sdc1) in my system and I received the
"device not cleared" error with sanlock and lvmlockd running. I've
searched the internet but nothing has solved my problem. So I'm here to
ask for your help.

root@n151-143-035:~# lvmlockd -V
lvmlockd version: 2.03.02(2) (2018-12-18)
root@n151-143-035:~# sanlock -V
sanlock 3.6.0 (built Jul 11 2018 12:44:29)

root@n151-143-035:~# systemctl status sanlock
● sanlock.service - Shared Storage Lease Manager
    Loaded: loaded (/lib/systemd/system/sanlock.service; disabled; 
vendor preset: enabled)
    Active: active (running) since Thu 2022-05-05 00:31:17 CST; 11h ago
   Process: 25844 ExecStart=/usr/sbin/sanlock daemon $sanlock_opts 
(code=exited, status=0/SUCCESS)
  Main PID: 25850 (sanlock)
     Tasks: 6 (limit: 6143)
    CGroup: /system.slice/sanlock.service
            ├─25850 /usr/sbin/sanlock daemon -w 0
            └─25852 /usr/sbin/sanlock daemon -w 0
May 05 00:31:17 n151-143-035 systemd[1]: Starting Shared Storage Lease 
Manager...
May 05 00:31:17 n151-143-035 systemd[1]: Started Shared Storage Lease 
Manager.

root@n151-143-035:~# systemctl status lvmlockd
● lvmlockd.service - LVM lock daemon
    Loaded: loaded (/lib/systemd/system/lvmlockd.service; enabled; 
vendor preset: enabled)
    Active: active (running) since Thu 2022-05-05 00:31:23 CST; 11h ago
      Docs: man:lvmlockd(8)
  Main PID: 26152 (lvmlockd)
     Tasks: 3 (limit: 6143)
    CGroup: /system.slice/lvmlockd.service
            └─26152 /sbin/lvmlockd --foreground
May 05 00:31:23 n151-143-035 systemd[1]: Starting LVM lock daemon...
May 05 00:31:23 n151-143-035 lvmlockd[26152]: [D] creating 
/run/lvm/lvmlockd.socket
May 05 00:31:23 n151-143-035 lvmlockd[26152]: 1651681883 lvmlockd started
May 05 00:31:23 n151-143-035 systemd[1]: Started LVM lock daemon.

root@n151-143-035:~# pvs
   Skipping global lock: lockspace not found or started
root@n151-143-035:~# pvcreate /dev/mapper/mpatha1
   Global lock failed: check that global lockspace is started
root@n151-143-035:~# pvs
   Skipping global lock: lockspace not found or started

It is mentioned in the main page under "creating the first sanlock VG"
that the first VG is created to get the global lock, so I create the VG
directly:

root@n151-143-035:~# vgcreate --lock-type sanlock --shared test 
/dev/mapper/mpatha1 --verbose
   Enabling sanlock global lock
     Wiping signatures on new PV /dev/mapper/mpatha1.
     Set up physical volume for "/dev/mapper/mpatha1" with 2147483648 
available sectors.
     Zeroing start of device /dev/mapper/mpatha1.
     Writing physical volume data to disk "/dev/mapper/mpatha1".
   Physical volume "/dev/mapper/mpatha1" successfully created.
     Adding physical volume '/dev/mapper/mpatha1' to volume group 'test'
     Archiving volume group "test" metadata (seqno 0).
     Creating logical volume lvmlock
     Creating volume group backup "/etc/lvm/backup/test" (seqno 2).
     Activating logical volume test/lvmlock.
     activation/volume_list configuration setting not defined: Checking 
only host tags for test/lvmlock.
     Creating test-lvmlock
     Loading table for test-lvmlock (254:1).
     Resuming test-lvmlock (254:1).
   /dev/test/lvmlock: not found: device not cleared
   Aborting. Failed to wipe start of new LV.
     Removing test-lvmlock (254:1)
     Creating volume group backup "/etc/lvm/backup/test" (seqno 3).
   Failed to create sanlock lv lvmlock in vg test
   Failed to create internal lv.
   Failed to initialize lock args for lock type sanlock
     Removing physical volume "/dev/mapper/mpatha1" from volume group "test"
   Volume group "test" successfully removed
root@n151-143-035:~# pvs
   Skipping global lock: lockspace not found or started
   PV                  VG Fmt  Attr PSize PFree
   /dev/mapper/mpatha1    lvm2 ---  1.00t 1.00t
root@n151-143-035:~# vgs
   Skipping global lock: lockspace not found or started

I set use_lvmlockd = 1 in the configuration file /etc/lvm/lvm.conf and
did not find useful log information in /var/log/syslog and /var/log
/sanlock.log. And I can successfully use and create lvm when
use_lvmlockd = 0.

Regards,

Zhiyong Ye

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