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

[Peter Petrakis]

A few things, ask the customer to run the command 'multipath -v4'
as root after the package install failure so we can see what's going on.

There's at least one bug in the multipath.conf

1) scsi_id path is wrong
2) the blacklist regex is suspect

1)
Replace all calls to scsi id with:

"/lib/udev/scsi_id -g -u -d /dev/%n"


2) This regex assumes the sd names are ordered, this is never true.

Why are these sd devices being blacklisted to begin with?

blacklist {
       devnode "^sda[1-7]"
       devnode "^sd[f-z]"
       devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
       devnode "^hd[a-z]"
}

SD driver pre-allocates up to 15 partitions per whole block device,
the first regex only filters out the 1/2 of the possible partitions of
the first probed device.

If I'm to believe this blacklist then we're looking to serve
sda8-15, sdb, c,d,e and that's it.

I don't think this blacklist is viable, try commenting out the first two
devnodes.

Please try each change independently and as a whole, and report.

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

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