HITACHI SAN Array Presents Excessive Disks/Paths per LUN with High LUN Numbers

(Doc ID 798373.1)

Last updated on MARCH 08, 2017

Applies to:

Linux Kernel - Version: 2.6 to 2.6
Oracle VM - Version: 2.1 to 2.1.5
Linux Itanium
Linux x86-64

Symptoms

Significantly more Paths than expected are listed for LUNs on an Hitachi storage array e.g. 36 as opposed to 4.
Some devices are not shown completely.

[root@test1 dev]# multipath -ll
360060e8014427b000001427b001021aadm-2 HITACHI,OPEN-V
[size=56G][features=0][hwhandler=0]
\_ round-robin 0 [prio=8][enabled]
\_ 1:0:0:49155 sdu 65:64  [active][ready]

The issue is known to affect Oracle/Red Hat Enterprise Linux 5/Oracle VM (OEL5/RHEL5/OVM) systems, however, does not OEL4/RHEL4 systems.

Changes

Changes likely to account for the issue include:

You have recently deployed OEL5/RHEL5 systems that use an Hitachi storage array
You have recently upgraded from OEL4/RHEL4 to OEL5/RHEL5

Cause

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