removing a hdiskpower device in aix

You have it mostly right.

You first need to do whatever steps are necessary to get the hdiskpower device out of the volume group. This may not necessarily involve steps 1-4. You could just perform a "reducevg" operation.

Once the hdiskpower device is out of the VG, perform the following steps to remove the device from AIX completely.

1. powermt display dev=# (where # is the hdiskpower number)
2. make note of the hdisk devices for this hdiskpower device
3. powermt remove dev=#
4. rmdev -Rdl hdiskpower#
5. rmdev -Rdl hdisk# (do this for each of the hdisks you recorded in step 2)

I use the script below to remove hdiskpower devices from an AIX host. It takes a file with one or more hdiskpower device names as input. It also records the storage system ID and device ID (Symm and Clariion only) for reference when you go to reclaim the storage on the array(s).

#!/bin/ksh

# Script to remove all PowerPath devices and their child
# hdisks.

# Usage: mkclean < devlist
#
# Where:
#
# devlist: List of hdiskpower devices, one per line

# Read each Powerpath device from the input file and determine
# the child hdisks. Also record the storage array serial number
# and array device ID for later array maintenance.

if [ -f `pwd`/arrayinfo.txt ]
then
rm `pwd`/arrayinfo.txt
fi
HDISKLIST=""
TMPFILE=`pwd`/pptmp.txt
while read POWDEV
do

powermt display dev=$POWDEV > $TMPFILE
grep "Symmetrix ID" $TMPFILE > /dev/null
if [ $? -eq 0 ]
then

# This is a Symmerix device so get the SN and LVID

grep "Symmetrix ID" $TMPFILE | read LINE
SN=${LINE##*=}
grep "Logical device ID=" $TMPFILE | read LINE
LUN=${LINE##*=}
print "$SN $LUN" >> arrayinfo.txt
grep fscsi $TMPFILE | while read f1 f2 HDISK rest
do
HDISKLIST="$HDISKLIST $HDISK"
done

# Now remove the devices from the host

powermt remove dev=$POWDEV
rmdev -Rdl $POWDEV
for HDISK in $HDISKLIST
do
rmdev -Rdl $HDISK
done

else

# This is a Clariion device so get the SN and LUN ID

grep "CLARiiON ID" $TMPFILE | read LINE
SN=${LINE##*=}
SN=${SN%% \[*}
grep "Logical device ID=" $TMPFILE | read LINE
LUN=${LINE##*LUN }
LUN=${LUN%\]}
print "$SN $LUN" >> arrayinfo.txt
grep fscsi $TMPFILE | while read f1 f2 HDISK rest
do
HDISKLIST="$HDISKLIST $HDISK"
done

# Now remove the devices from the host

powermt remove dev=$POWDEV
rmdev -Rdl $POWDEV
for HDISK in $HDISKLIST
do
rmdev -Rdl $HDISK
done
fi

rm $TMPFILE
HDISKLIST=""
done

chuck,

thanks for the help. i have a question on your steps:

3. powermt remove dev=#
4. rmdev -Rdl hdiskpower#


doesnt powermt remove dev=#, that removes the hdiskpower device, so why you need the rmdev -Rdl hdiskpower?

powermt remove dev=#

This command just removes the device from PowerPath control. The device is still in the AIX ODM.

rmdev -Rdl hdiskpower#

This command actually removes the device from the AIX ODM. This is necessary if you want to deallocate the device from the host.

I hope this helps.

-Chuck

Spot on.

Just one thing tho' you might want to deallocate the device from the Symm/Clariion, or it'll be back at the next cfgmgr.