topic Re: Cluster configuration collection issues! in Operating System - HP-UX

Cluster configuration collection issues!

Amit Manna_6 — Fri, 02 Feb 2007 13:33:13 GMT

HI,
I have a N class server in clsuter. The cluster lock disk. I am trying to collect the cluster information using cmgetconf command. But its gives error:

Unable to find the cluster lock disk.
Is there any way we can get the cluster configuration

Re: Cluster configuration collection issues!

melvyn burnard — Fri, 02 Feb 2007 14:13:35 GMT

try using cmviewconf

Re: Cluster configuration collection issues!

Geoff Wild — Fri, 02 Feb 2007 16:15:27 GMT

Here's a little script:

Rgds...Geoff

# cat chkclusterlock

#!/bin/sh
#
# script to check for existence of cluster lock
#
# gwild

PATH=/usr/bin:/usr/sbin

if [[ `id -u` != 0 ]]
then
print "\n$0: Must be super-user to run this command."
exit 1
fi

HOST=`hostname`
DEV=`cmviewconf |sed -n -e "/$HOST/{$!N;p;}" -e h | cut -d: -f2 |grep dev|awk -F/ '{print $4}'`

if [ -c /dev/rdsk/$DEV ]
then
SIZE=`diskinfo /dev/rdsk/$DEV | grep size |awk '{print $2}'`
if [ $SIZE = "io_search failed: No match found." ]
then
echo "The disk /dev/rdsk/$DEV does NOT exist on $HOST!!!"
exit 1
fi
echo "The cluster lock disk /dev/rdsk/$DEV on $HOST is $SIZE kbytes."
exit 0
else
echo "/dev/rdsk/$DEV does not exist on $HOST!!!"
exit 1
fi

Re: Cluster configuration collection issues!

Amit Manna_6 — Fri, 02 Feb 2007 21:50:03 GMT

HI,
Here the cluster lock disk has failed. Before applying new configuration i want to keep a copy of existing one.
Any ideas.

Re: Cluster configuration collection issues!

Mridul Shrivastava — Fri, 02 Feb 2007 22:04:22 GMT

If cluster disk has failed then I would recommend to get it replaced and then make any changes to the cluster.

Ideally down time is required to replace the cluster lock disk and I hope that you have taken vgcfgbackup after cmapplyconf.. else the vg configuration won't have the lock information and it can't be restored after replacing the disk.

Re: Cluster configuration collection issues!

Amit Manna_6 — Fri, 02 Feb 2007 23:25:11 GMT

Hi Mridul,
Before replacing the disk i wanted to run a cmgetcong to store the existing copy in a file. But it gives error: unable to open cluser lock disk:
ANy suggestions

Re: Cluster configuration collection issues!

Mridul Shrivastava — Sat, 03 Feb 2007 00:30:52 GMT

It won't be feasible to backup the cluster configuration if cluster lock disk is not accessible. However you can take pkg configuration backup using cmgetconf -p .

If the disk is hot swappable,you have LVM OLAR patches installed and you have a valid vgcfg backup then this disk can be replaced online and restore the vgcfg after replacement and then take backup.

I don't find any option where we can skip the cluster lock disk and take the cluster configuration backup.

Re: Cluster configuration collection issues!

Amit Manna_6 — Sat, 03 Feb 2007 03:42:46 GMT

HI Mridul,
Can i check the existing cluster configuration details using cmviewcl -v and according to the configuartion can i update a old ascii file and do cmapplyconf.

Please reply asap

Re: Cluster configuration collection issues!

Mridul Shrivastava — Sat, 03 Feb 2007 04:14:56 GMT

Instead of using cmviewcl -v, I would go for cmviewconf, I doubt it works now on ur system or not...

Have you tried running cmscancl ? this will also give you more detailed information about the cluster..

Re: Cluster configuration collection issues!

melvyn burnard — Sat, 03 Feb 2007 06:09:42 GMT

if the cluster lock disc has failed, you must replace it and do a vgcfgrestore. HOPEFULLY you had run a vgcfgbackup of the cluster lock vg once it was marked as a cluster lock, and when it was activated.
If so, that shoul dfix your problem without having any issues.

Re: Cluster configuration collection issues!

Amit Manna_6 — Sat, 03 Feb 2007 06:52:30 GMT

HI,
Here the path to cluster lock disk has failed. So device files are missing.

Whats the best way to solve the issue

Re: Cluster configuration collection issues!

Mridul Shrivastava — Sat, 03 Feb 2007 20:40:53 GMT

Hi Amit,

Vould you please brief , what do u mean by hardware path is missing:

Is it that hardware path itself is not appearing in ioscan? => need to check the external sotrage/enclosure connected ( there must be a path, however it could be showing NO_HW there).

Is it that device files are not appearing for the disk , however hardware path is there in ioscan? => try running "insf -H < hw path> " this will create the device files for devices connected to the mentioned hw path.