Boot from SAN system shows mismatch of WWIDs in Red Hat Enterprise Linux 5

Solution Unverified - Updated -

Issue

  • A system has inconsistent multipath user_friendly_names between reboots.

  • A system booting from SAN is showing mismatching WWIDs. The output of the command multipath -ll and the entries in /etc/multipath/bindings file shows mismatching WWIDs:

#cat /etc/multipath/bindings:
mpath19 360060e80164c920000014c92000008e3
mpath20 360060e80164c920000014c92000008e4
mpath21 360060e80164c920000014c9200000f00
# multipath -ll
mpath19 (360060e80164c920000014c92000008e4) dm-16 HP,OPEN-V
[size=28G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 1:0:4:19  sdap 66:144 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:4:19  sdt  65:48  [active][ready]
mpath20 (360060e80164c920000014c9200000f00) dm-17 HP,OPEN-V
[size=55G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 1:0:4:20  sdaq 66:160 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:4:20  sdu  65:64  [active][ready]
mpath21 (360060e80164c920000014c92000008d3) dm-21 HP,OPEN-V-CM
[size=201M][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 1:0:4:192 sdar 66:176 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:4:192 sdv  65:80  [active][ready]
  • Every time a new disk is added the same problem appears.
  • A system with root (/) on a multipath device shows the incorrect device/wwid mapping in multipath -ll

Environment

  • Red Hat Enterprise Linux (RHEL) 5
  • device-mapper-multipath
  • / file system resides on a multipath map

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In