How to activate Service Guard Volume group for maintenance

[John Jayaseelan]

Hi,

I would like to add a physical disk on a Service Guard Volume group. I tried to activate the volume group without starting the cluster services and received the following messages

# vgchange -a y /dev/vginf
vgchange: Activation mode requested for the volume group "/dev/vginf" conflicts
with configured mode.

Could you please tell how to activate the VG.

Thanks
John Jayaseelan

[Birgit Federmann]

Hi,

cluster volume groups always have to be activated in exclusive mode. Try

vgchange -a e /dev/vginf

Kind regards,

Birgit

[melvyn burnard]

if cmcld is running, i.e. cluster is up, then vgchange -a e should be used, assuming the package is down and the vg is not activated.
If there is no cmcld runing, then you need to do vgchange -a n
vgchange -a y
do your work,
vgchange -a n
vgchange -c y
then start the cluster and TEST the vg

[Marco Santerre]

In order to activate your Volume Groups without starting your cluster, all you have to do is

#vgchange -c n vgname
#vgchange -a y vgname

and when you are done you just need to deactivate your VG with

#vgchange -a n vgname

and the cluster will reinstate your VG in the cluster.

[John Jayaseelan]

While trying vgchange -a e /dev/vginf , I received a message like "HA Cluster node is not reachable'.

Thanks

[Jochen Heuer]

Hi John,

since you want to add a disk to a cluster volume group you have to export / import the VG on the other node too. Have a look at the Software Recovery handbook chapter 19:

http://www.itrc.hp.com/service/iv/node.do?node=prod%2FWW_Start%2FN1%7C16

[Jean-Louis Phelix]

Hi,

As melvyn told you, to activate a vg in exclusive mode, MC ServiceGuard must be running. If not, then you should first unset the exclusive flag using vgchange -c n (you won't be able to reactivate it using -c y until service guard is back), and then use a normal vgchange -a y.

Regards.

[Jochen Heuer]

You should have a look at

- Useful Procedures and Commands

--> LVM Modifications of Cluster Volume Groups

Regards,

Jochen

[John Jayaseelan]

Jochen Heuer ,

Could you please tell where/How 'Useful Procedures and Commands - LVM Modifications of Cluster Volume Groups - ' can be accessed.

Thanks

[Jochen Heuer]

Hi John,

it's in chapter 19 of the Software Recovery handbook I mentioned above. But you need to have access to the knowledge trees ....

Regards,

Jochen

[MANOJ SRIVASTAVA]

Hi John


The best palce to know is teh control script template which you can print to know the details for the activation :

# VOLUME GROUP ACTIVATION:
# Specify the method of activation for volume groups.
# Leave the default ("VGCHANGE="vgchange -a e") if you want volume
# groups activated in exclusive mode. This assumes the volume groups have
# been initialized with 'vgchange -c y' at the time of creation.
#
# Uncomment the first line (VGCHANGE="vgchange -a e -q n"), and comment
# out the default, if your disks are mirrored on separate physical paths,
#
# Uncomment the second line (VGCHANGE="vgchange -a y") if you wish to
# use non-exclusive activation mode. Single node cluster configurations
# must use non-exclusive activation.
#
# VGCHANGE="vgchange -a e -q n"
# VGCHANGE="vgchange -a y"
VGCHANGE="vgchange -a e" # Default

# VOLUME GROUPS
# Specify which volume groups are used by this package. Uncomment VG[0]=""
# and fill in the name of your first volume group. You must begin with
# VG[0], and increment the list in sequence.
#
# For example, if this package uses your volume groups vg01 and vg02, enter:
# VG[0]=vg01
# VG[1]=vg02
#
# The volume group activation method is defined above. The filesystems
# associated with these volume groups are specified below.


also you can look at this link for your commands .

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B3936-90026/B3936-90026_top.html&con=/hpux/onlinedocs/B3936-90026/00/00/5-con.html&toc=/hpux/onlinedocs/B3936-90026/00/00/5-toc.html&searchterms=MC%7cservice%7cGaurd&queryid=20030120-075535



Manoj Srivastava

[David Caldicott]

John,

What we have done is to create a "maintenance" mode package similar to the real package, which mounts all the filesystems but does not start any services. We name the package "_mtce". In order to install new versions of application files or carry out LVM configuration, simply halt the real package and run the maintenance one.

Regards,
David Caldicott