ESXi 4.0 multiple iSCSI targets not all visible

[jeff_stelzner]

I have multiple ESXi 4.0 hosts connecting to multiple iSCSI targets/devices via the software iSCSI initiator, using fixed path.

The iSCSI targets are CentOS Linux 5.4 VMs running scsi-target-utils , they work fine if each host discovers/connects only to a single target . Each target presents a LUN 0 + LUN 1 , the latter obviously being the vmfs3 datastore.

Here's where the plot thickens...

If I add multiple targets to the Discovery list, however, the host show paths to all of them on the Storage Adapter | Paths tab, but only 1 is designated as "Active I/O". And only 1 target shows up on the Device tab .

I have assigned unique IQN names to the targets, I'm not sure what else might be an issue here. Any pointers/tips appreciated. Thanks!

[wkuykend]

I had the same problem when attempting to connect my ESXi server to two different CentOS 5 targets that were configured identically. I could see both paths but only one LUN was available when I attempted to add storage. My problem was due to the same "SCSI ID" and "SCSI SN" being assigned to the target on both CentOS servers:

CentOS Server #1:

Target 1: iqn.2010-04.dfwlabsan01:iscsi01

System information:

Driver: iscsi

State: ready

I_T nexus information:

I_T nexus: 1

Initiator: iqn.1998-01.com.vmware:pcp306543pcs-7d5e65a6

Connection: 0

IP Address: 10.0.0.4

LUN information:

LUN: 0

Type: controller

SCSI ID: IET 00010000

SCSI SN: beaf10

Size: 0 MB

Online: Yes

Removable media: No

Backing store: No backing store

LUN: 1

Type: disk

SCSI ID: IET 00010001

• SCSI SN: beaf11*

Size: 440234 MB

Online: Yes

Removable media: No

Backing store: /dev/vg.iscsi01/lv.iscsi01

Account information:

ACL information:

CentOS Server #2:

Target 1: iqn.2010-04.dfwlabsan02:iscsi02

System information:

Driver: iscsi

State: ready

I_T nexus information:

I_T nexus: 1

Initiator: iqn.1998-01.com.vmware:pcp306543pcs-7d5e65a6

Connection: 0

IP Address: 10.0.0.4

LUN information:

LUN: 0

Type: controller

SCSI ID: IET 00010000

• SCSI SN: beaf10*

Size: 0 MB

Online: Yes

Removable media: No

Backing store: No backing store

LUN: 1

Type: disk

SCSI ID: IET 00010001

• SCSI SN: beaf11*

Size: 440234 MB

Online: Yes

Removable media: No

Backing store: /dev/vg.iscsi02/lv.iscsi02

Account information:

ACL information:

To correct this, I used a different target ID and lun number when creating the target on the second CentOS server to force the SCSI ID and SCSI SN to be unique on each server:

tgtadm --lld iscsi --op new --mode target --tid 2 -T iqn.2010-04.dfwlabsan02:iscsi02

tgtadm --lld iscsi --op new --mode logicalunit --tid 2 --lun 3 -b /dev/vg.iscsi02/lv.iscsi02

Target 2: iqn.2010-04.dfwlabsan02:iscsi02

System information:

Driver: iscsi

State: ready

I_T nexus information:

I_T nexus: 1

Initiator: iqn.1998-01.com.vmware:pcp306543pcs-7d5e65a6

Connection: 0

IP Address: 10.0.0.4

LUN information:

LUN: 0

Type: controller

SCSI ID: IET 00020000

• SCSI SN: beaf20*

Size: 0 MB

Online: Yes

Removable media: No

Backing store: No backing store

LUN: 3

Type: disk

SCSI ID: IET 00020003

• SCSI SN: beaf23*

Size: 440234 MB

Online: Yes

Removable media: No

Backing store: /dev/vg.iscsi02/lv.iscsi02

Account information:

ACL information:

Len