Hi James,
I agree it's likely to be an lvm/udev race; some observations:
1) It doesn't seem to happen with files
2) With lvm, It doesn't always happen if the guest is configured with a
single core; most of the time but not always
3) With lvm it seems to happen (almost?) always when the guest has
multiple cores.
output of tgtadm as requested:
----- lvm based, bad ---
Target 1: iqn.2008-09.com.example:server1.share1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd283
Connection: 0
IP Address: 192.168.123.12
I_T nexus: 2
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd282
Connection: 0
IP Address: 192.168.122.12
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
Account information:
ACL information:
ALL
--- LVM based, after restarting tgt ---
Target 1: iqn.2008-09.com.example:server1.share1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd283
Connection: 0
IP Address: 192.168.123.12
I_T nexus: 2
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd282
Connection: 0
IP Address: 192.168.122.12
I_T nexus: 3
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd283
Connection: 0
IP Address: 192.168.123.12
I_T nexus: 4
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd282
Connection: 0
IP Address: 192.168.122.12
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 10737 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/mapper/server1-share1
Backing store flags:
Account information:
ACL information:
ALL
(can also see the client accessing it there)
--- file based, good ---
Target 1: iqn.2008-09.com.example:server1.share1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 5
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd283
Connection: 0
IP Address: 192.168.123.12
I_T nexus: 6
Initiator: iqn.2005-03.org.open-iscsi:2b2883cd282
Connection: 0
IP Address: 192.168.122.12
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 1074 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /home/dg/afile
Backing store flags:
Account information:
ACL information:
ALL
** Changed in: tgt (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1048008
Title:
tgt needs restart to find LUN
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