[Bug 1020436] Re: Cannot read superblock after FC multipath failover

[Peter Petrakis]

Thanks for all the feedback, there's quite a bit of information here to sort through. 
In the meanwhile, it would be an interesting data point to see how well this array
functions under multipath 0.4.9, which is what Precise, the new LTS uses.

This can be accomplished by using apt pinning.

http://askubuntu.com/questions/103320/install-packages-from-newer-
release-without-building-apt-pinning/103338#103338

In your case:

$ sudo tee /etc/apt/sources.list.d/precise.list << EOF
deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted

deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted
EOF

$ sudo tee /etc/apt/preferences << EOF
Package: multipath-tools*
Pin: release n=precise
Pin-Priority: 990

Package: *
Pin: release n=lucid
Pin-Priority: 900

Package: *
Pin: release o=Ubuntu
Pin-Priority: -10
EOF

$ sudo apt-get update
$ sudo apt-get upgrade

Should update multipath-tools and boot to 0.4.9, if not then
$ sudo apt-get install -t precise multipath-tools multipath-tools-boot

This should unjam you while we triage the data and will provide
a valuable data point to aid in backporting if necessary.

Note that the config syntax has changed slightly.

https://help.ubuntu.com/12.04/serverguide/device-mapper-
multipathing.html#multipath-new-and-changed-features

It's ok to leave both directives in the file multpath simply globs keywords and uses
the ones that "fit". Remember to update your initrd after changing the config file.

I assume you have multiple SAN clients, please keep one at 0.4.8 so we can continue
to debug this. Thanks.

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https://bugs.launchpad.net/bugs/1020436

Title:
  Cannot read superblock after FC multipath failover

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