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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