[Bug 716659] Re: Root filesystem goes "Read only" after installing multipath-tools on Lucid

[Peter Petrakis]

>From examining the output and can see why the blacklist was
defined  in this manner, and how to correct it.

Also, since the luns are reporting themselves as DGC, specifying
a configuration for SYMMETRIX just won't work. Clarion and
Symmetrix are completely different animals from what I gather.

Attached is a new multipath.conf (rename it correctly before
moving to etc) that contains what I believe to be the configuration
they're trying to achieve. Unfortunately, this is array is so configurable,
all this effort could be a waste if it's not setup correctly.

Should this config not work, try deleting the 'devices' section
entirely and reboot. Multipath carries a configuration for DGC
already that might work.

# echo 'show config' | multipathd -k
...
        device {
                vendor DGC
                product .*
                product_blacklist LUNZ
                path_grouping_policy group_by_prio
                path_checker emc_clariion
                features 1 queue_if_no_path
                hardware_handler 1 emc
                prio_callout /sbin/mpath_prio_emc /dev/%n
                failback immediate
                no_path_retry 60
        }

Failing that I would suggest that the customer make the array work with
powerpath first, so we know the HW is configured correctly, and then 
we can try again with multipath.


** Attachment added: "Experimental EMC Clarion config"
   https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/716659/+attachment/1878975/+files/multipath-v1.conf

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https://bugs.launchpad.net/bugs/716659

Title:
  Root filesystem goes "Read only" after installing multipath-tools on
  Lucid