Problem with LVM on iSCSI after reboot

hawkeyexp · 9. Juni 2014

Hi @ all,

i played around with the iSCSI and a xenserver (6.2). On OMV there is a raid5 which is added to iscsi-plugin. Xenserver could perfectly mount it and created it's storage on it (LVM). After reboot the iSCSI storage is not longer accessible - local lvm is breaking iSCSI and blocks access. Is there any way to get back access to the raid5 via iSCSI ? A temp solution is ok ! There are no needed data on the raid5 but it would be nice to know to get them back if this happens...

Thx

regis · 30. Juni 2014

Hi all

I have exactly the same problem :

installed OMV 0.5.49 and iscsi plugin, configured a target with a disk in block mode, mounted it on Xenserver 6.2, created VMs, installed Oses, everything went fine.

but after the reboot of my lab, the iscsi target has no lun anymore.

the logs :

Jun 30 00:41:36 ax2omv kernel: [ 863.930352] iSCSI Enterprise Target Software - version 1.4.20.2
Jun 30 00:41:36 ax2omv kernel: [ 863.930449] iscsi_trgt: Registered io type fileio
Jun 30 00:41:36 ax2omv kernel: [ 863.930451] iscsi_trgt: Registered io type blockio
Jun 30 00:41:36 ax2omv kernel: [ 863.930453] iscsi_trgt: Registered io type nullio
Jun 30 00:41:36 ax2omv kernel: [ 863.934512] iscsi_trgt: blockio_open_path(168) Can't open device /dev/sdb, error -16
Jun 30 00:41:36 ax2omv kernel: [ 863.935002] iscsi_trgt: blockio_attach(295) Error attaching Lun 0 to Target iqn.2014-06.local.ax2omv:iqn.2014-06.org.openmediavault.tgt1
Jun 30 00:41:36 ax2omv ietd: unable to create logical unit 0 in target 1: 16

sdb disk is ok on the physical disks page, everything's seems ok but iscsi_trgt is unable to use the disk.

thanks for your help

przemas75 · 17. Dezember 2015

Hi,
Had this issue today, i have sorted it out changing /etc/lvm/lvm.conf

Look for 'filter' stanzas. i have excluded sde disk from LVM scan during bootup, mine config looks like this:

Code

filter = [ "r|/dev/sde|" ]


    # By default we accept every block device:
    # filter = [ "a/.*/" ]

Better use some id, like:

Code

filter = [ "r|/dev/disk/by-path/pci-0000:00:11.0-scsi-3:0:0:0|" ]

And before this change, vgscan worked like that:

Code

bash:# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "xen" using metadata type lvm2

After the change:

Code

bash:# vgscan
  Reading all physical volumes.  This may take a while...
  No volume groups found

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