SMPFR

Mar  1 01:10:41 srv-filer1 ietd: Can't create a logical unit 22 5 0 Path=/dev/clients/backup,Type=blockio,ScsiId=,ScsiSN=,IOMode=wt 
Mar  1 01:10:41 srv-filer1 kernel: [  218.313882] iscsi_trgt: Target iqn.2011-02.com.openfiler:ServiceBackup, LUN 0: unknown param ScsiId=
Mar  1 01:10:41 srv-filer1 kernel: [  218.313893] iscsi_trgt: blockio_attach(355) Error attaching Lun 0 to Target iqn.2011-02.com.openfiler:ServiceBackup 

Permanent fix
To permanently fix this on OpenFiler 2.3, make three tweaks at the command line, logged in as root.

1. Comment out the following lines (lines 333-337) in /etc/rc.sysinit (add a # to the beginning of each line).

# if [ -x /sbin/lvm.static ]; then
# if /sbin/lvm.static vgscan --mknodes --ignorelockingfailure > /dev/null 2>&1 ; then
# action $"Setting up Logical Volume Management:" /sbin/lvm.static vgchange -a y --ignorelockingfailure
# fi
# fi
2. Modify /etc/lvm/lvm.conf, line 53 and make the line look like so (add some additional filters):

filter = [ "r|/dev/dm-*|", "r|/dev/VG_XenStorage*|", "r|/dev/sr/iscsi|", "a/.*/" ]
3. Turn the ATA over Ethernet service off, and make sure it doesn't start again (most people are *NOT* using this...)

[root@my_filer ~]# service aoe force-stop
[ OK ]
[root@my_filer ~]# service aoe status
devices:

[root@my_filer ~]# chkconfig aoe off
After making these 3 changes, reboot the Openfiler, and your clients will see their targets again.