topic Re: Cluster Lock - Service Guard in Operating System - HP-UX

Cluster Lock - Service Guard

Vasikaran Venkatesan — Thu, 17 Jul 2003 15:24:20 GMT

I need to move the cluster Lock VG / PV from one storage to another. Since i am planning to use a data VG for the cluster lock VG, how do i go about it. This is a new data VG.
steps i am thinking of:
Edit the ascii.file for new LOCK VG/PV info.;
check ; vgchange -a y ; apply.
Since i am doing -a y on the VG, and have the details of VOLUME GROUP in the tail of the ascii file, will it be enough to make the VG cluster aware ?. Is there anything that i am missing ?.

Thanks,

Vasikaran

Re: Cluster Lock - Service Guard

Tim D Fulford — Thu, 17 Jul 2003 17:23:12 GMT

Yes

You ned to re-apply the service-guard binaries
cmapplyconf -v -C /etc/cmcluster/ -p /etc/cmcluster// ....

This process will write the relavent information into the lock disk.

Regards

Tim

Re: Cluster Lock - Service Guard

Vasikaran Venkatesan — Thu, 17 Jul 2003 18:02:58 GMT

ofcourse i am doing the cmapply.
But my question is, since i do "vgchange -a n"
on the VG, will it be still cluster aware after the cmapply ?.

Since this LockVG is a data VG also, this will be enabled all the time when the package is up, not like the normal VGLOCK, whose main purpose is to handle only Lock mechanism and stay deactivated.

Re: Cluster Lock - Service Guard

Srinivas Thokala_1 — Thu, 17 Jul 2003 20:19:52 GMT

You need to edit cluster ascii file at two places, FIRST_CLUSTER_LOCK_VG /dev/vgname
and at the end for VOLUME_GROUP /dev/vgname

If you have a spare disk, create a seperate VG as /dev/vglock rather than naming data VG as
cluster lock disk, edit cluster ascii file as above and recompile cluster binary file with cmapplyconf.

Srini

Re: Cluster Lock - Service Guard

Sridhar Bhaskarla — Thu, 17 Jul 2003 22:30:46 GMT

Hi Vasikaran,

Halt the cluster.

Leave it activated with "vgchange -a y". cmapplyconf will take care of making it cluster aware. But make sure it is activated on the node from which you are applying the configuration.

-Sri

Re: Cluster Lock - Service Guard

Massimo Bianchi — Fri, 18 Jul 2003 07:14:39 GMT

Hi,
a little addition to Shridar (i hope to wrote it well).

You must activate the vg with

vgchange -a e

since it's already marked as cluster aware.

After the cmapply, close it
vgchange -a n

and start newly the cluster.

HTH,
Massimo

Re: Cluster Lock - Service Guard

Bernhard Mueller — Fri, 18 Jul 2003 07:19:43 GMT

Most important you should be aware that for this change you must stop the entire cluster with all its packages(cmhaltcl).

A vgchange -a n does not change the "cluster aware" status of a vg.

Regards,
Bernhard

Re: Cluster Lock - Service Guard

Tim D Fulford — Fri, 18 Jul 2003 08:12:53 GMT

Im sorry my reply offended you.

Here is a manual

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B5158-90044/B5158-90044_top.html&con=/hpux/onlinedocs/B5158-90044/00/00/48-con.html&toc=/hpux/onlinedocs/B5158-90044/00/00/48-toc.html&searchterms=cmapplyconf&queryid=20030718-031139

Tim

Re: Cluster Lock - Service Guard

Enrico P. — Fri, 18 Jul 2003 08:41:16 GMT

Hi,

#cmhaltcl

#cp -p /etc/cmcluster/.ascii /etc/cmcluster/.ascii.old

modify the .ascii file

#vgchange -c n /dev/NEW_VG_LOCK (if it is a old vg already in cluster)

#vgchange -a y /dev/NEW_VG_LOCK (if it is a new vg)

#cmcheckconf -v -C /etc/cmcluster/.ascii

#cmapplyconf -v -C /etc/cmcluster/.ascii

#cmruncl

Enrico

Re: Cluster Lock - Service Guard

Vasikaran Venkatesan — Fri, 18 Jul 2003 13:18:17 GMT

Thanks to all of you for the excellent information.