[Linux-cluster] partition tables not sync'd

[Robert Hurst]

I erase that cache before invoking EMC PowerPath, because I have had
issues with changes not making it to that multipathing I/O solution.  I
have experienced no issues doing it adhoc, either.

rescan-scsi bus doesn't necessarily work with the fiber channel cards...
I have to send an equivalent scsi request command directly to the fc
driver (in our case, we are using Emulex lpfc).  An example script we
use:

#!/bin/bash
#
# rescan Emulex Fiber Channel card for new SCSI devices
#

ACTION=`basename $0`

powermt display dev=all | grep emcpower > /tmp/$ACTION.old

echo 0 > /sys/class/fc_host/host0/issue_lip
echo "- - -" > /sys/class/scsi_host/host0/scan

echo 1 > /sys/class/fc_host/host1/issue_lip
echo "- - -" > /sys/class/scsi_host/host1/scan

powermt config

powermt display dev=all | grep emcpower > /tmp/$ACTION.new

echo "Differences before & after"
echo "=========================="
diff /tmp/$ACTION.old /tmp/$ACTION.new


On Tue, 2007-10-02 at 09:26 -0700, Ray Charles wrote:

> Well, in my original attempt i did a rescan-scsi_bus,
> vgscan and lvscan but the new partition didn't show
> up.
> 
> I think you're on to something that i also want to try
> and that's the /etc/lvm/.cache.
> 
> Any precautions? 
> 
> -tia


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