Pillar Axiom: APM may break on OEL 5.x and higher with automatic yum updates

Asset ID:	1-71-1581685.1
Update Date:	2013-09-22
Keywords:

Solution Type Technical Instruction Sure

Solution 1581685.1 : Pillar Axiom: APM may break on OEL 5.x and higher with automatic yum updates

Applies to:

Pillar Axiom 600 Storage System - Version All Versions to All Versions [Release All Releases]
Pillar Axiom 500 Storage System - Version All Versions to All Versions [Release All Releases]
Pillar Axiom 300 Storage System - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Goal

Installing APM on an OEL 5.x or higher system that automatically updates via yum may break the multipath tool functionality.

To determine whether a Yum update has broken multipath tools or its
dependencies on your Oracle Linux 5 host running APM, run the following
command:

#multipath -v3 -ll

The Yum update has broken multipath tools or its dependencies if the command
returns a blank result, or if you see the following message:

prio: sd*: couldn't get target port group (errno 22)

Solution

To correct the problem, revert back to the OS distributed version of multipathtools
and its dependencies by doing the following:
1 Remove APM from your host.
2 Remove the multipath-tools rpm files.
3 Re-install the OS distributed versions of the multipath-tools rpm files.
4 Reinstall APM.
After restoring the OS distributed versions and reinstalling APM, be sure to
disable updates to multipath-tools and kpartx by following these instructions"

Make the following addition to your Yum update environment after you install and configure
APM and multipath on your host. This addition prevents Yum from making
changes that keep multipath tools from working on your host.
Add the following line to the pkgSkipList entry in the /etc/sysconfig/rhn/up2date file:

device-mapper-multipath*;kpartx*;

If the above does not work, you can instruct the customer to add the following to the /etc/multipath.conf file with:

devices {
   device {
      vendor               "Pillar"
      product              "*"
      path_grouping_policy group_by_prio
      prio                 alua
      no_path_retry        60
      path_checker         tur
      failback             immediate
      dev_loss_tmo         60
      fast_io_fail_tmo     30
   }
}

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