4.1 and vCenter ESX only allows to use 1 Fibre Channel LUNS

Hello

I have 8 blades ESX 4.1 (build 348481) in a Cisco UCS 5108 chassis. Each blade has 2 x HBAs available. I also have a fiber channel storage array that is configured to provide 2 1.8 to LUN (for now and in the future).

When I go in vCenter and select one of the ESX servers under "Configuration"-> "Storage adapters"-> "Rescan all...» "each server detects the table (and several paths towards it) but only shows a single available LUNS (LUN 0) when 2 LUNS should be available (LUNS 0 and 1 logical unit number). See the image below.

esx1_singlelun.png

Now, the thing that confuses me is that when I get on the command-line of the ESX via SSH server and run "esxcfg-mpath - b", I see a list of all the paths including the paths to the LUNS 0 and 1 logical unit number (see output below). Any ideas on why ESX and vCenter authorizes me to LUN 1?

esxcfg-mpath - b:

NAA.600508e0000000001e10a036bc3f5601: FREE Serial Attached SCSI Disk (naa.600508e0000000001e10a036bc3f5601)
vmhba0:C1:t0:l0 LUN:0 Status: active sas adapter: 5c84c75ed0910000 target: 1563fbc36a0101e

MPX.vmhba32:C0:t0:l0: Local USB CD-ROM (mpx.vmhba32:C0:T0:L0)
vmhba32:C0:t0:l0 LUN:0 Status: Active Local HBA vmhba32 channel target 0 0

EUI.706f636c6162766f: disc SCST_FIO Fibre Channel (eui.706f636c6162766f)
vmhba2:C0:T1:L1 LUN:1 status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00:1e target: WWNN: 20:00:00:24: ff: 32:10:f2 WWPN: 21:00:00:24: ff: 32:10:f2
vmhba2:C0:T1:l0 LUN:0 Status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00:1e target: WWNN: 20:00:00:24: ff: 32:10:f2 WWPN: 21:00:00:24: ff: 32:10:f2
vmhba1:C0:t0:L1 LUN:1 status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00: target: WWNN: 20:00:00:24: ff: 32:45:c2 WWPN: 21:00:00:24: ff: 32:45:c2
vmhba1:C0:t0:l0 LUN:0 Status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00: target: WWNN: 20:00:00:24: ff: 32:45:c2 WWPN: 21:00:00:24: ff: 32:45:c2
vmhba1:C0:T1:L1 LUN:1 status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00: target: WWNN: 20:00:00:24: ff: 32:45:c3 WWPN: 21:00:00:24: ff: 32:45:c3
vmhba1:C0:T1:l0 LUN:0 Status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00: target: WWNN: 20:00:00:24: ff: 32:45:c3 WWPN: 21:00:00:24: ff: 32:45:c3
vmhba2:C0:t0:L1 LUN:1 status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00:1e target: WWNN: 20:00:00:24: ff: 32:10:f3 WWPN: 21:00:00:24: ff: 32:10:f3
vmhba2:C0:t0:l0 LUN:0 Status: active CF adapter: WWNN: 20:00:00:25:b5:00:00:ae WWPN: 20:00:00:25:b5:00:00:1e target: WWNN: 20:00:00:24: ff: 32:10:f3 WWPN: 21:00:00:24: ff: 32:10:f3

MPX.vmhba32:C0:t0:L1: USB Direct-access locally (mpx.vmhba32:C0:T0:L1)
vmhba32:C0:t0:L1 LUN:1 status: Active Local HBA vmhba32 channel target 0 0

MPX.vmhba32:C0:t0:L2: USB Direct-access locally (mpx.vmhba32:C0:T0:L2)
vmhba32:C0:t0:L2 LUN:2 status: Active Local HBA vmhba32 channel target 0 0

Its because the table shows two LUNS have the same value of ID of Page 83, ESX both think you have 2 paths to the same LUN.  Paths multiple ESX driver uses the value of the ID of Page 83 to determine if 2 LUNS are the same device.

It was a problem with that code, that it resembles yours-based Solaris beginning according to the tables and other tables that used code based on Solaris pre-COMSTAR, as well as tables that use SCWIST.

There is really nothing you can do about it, because it is a bug in the software of the array (it shouldn't be exporting 2 LUNS different with the same ID value of Page 83 - it is a violation of the standard).

Tags: VMware

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