remove alternate links to a volume group on cluster server where vg not active

[John J Burke]

Hi,

I have numerous errors on a cluster.

Error: Volume group /dev/vg01 is configured differently on node davlcn02 than on node davlcn05
Error: Volume group /dev/vg01 is configured differently on node davlcn02 than on node davlcn06
Error: Volume group /dev/vg01 is configured differently on node davlcn02 than on node davlcn07
Error: Volume group /dev/vg01 is configured differently on node davlcn03 than on node davlcn05
Error: Volume group /dev/vg01 is configured differently on node davlcn03 than on node davlcn06
Error: Volume group /dev/vg01 is configured differently on node davlcn03 than on node davlcn07
Error: Volume group /dev/vg01 is configured differently on node davlcn05 than on node davlcn02
Error: Volume group /dev/vg01 is configured differently on node davlcn05 than on node davlcn03
Error: Volume group /dev/vg01 is configured differently on node davlcn05 than on node davlcn06
Error: Volume group /dev/vg01 is configured differently on node davlcn05 than on node davlcn08
Error: Volume group /dev/vg01 is configured differently on node davlcn06 than on node davlcn02
Error: Volume group /dev/vg01 is configured differently on node davlcn06 than on node davlcn03
Error: Volume group /dev/vg01 is configured differently on node davlcn06 than on node davlcn05
Error: Volume group /dev/vg01 is configured differently on node davlcn06 than on node davlcn07
Error: Volume group /dev/vg01 is configured differently on node davlcn06 than on node davlcn08
Error: Volume group /dev/vg01 is configured differently on node davlcn07 than on node davlcn02
Error: Volume group /dev/vg01 is configured differently on node davlcn07 than on node davlcn03
Error: Volume group /dev/vg01 is configured differently on node davlcn07 than on node davlcn06
Error: Volume group /dev/vg01 is configured differently on node davlcn07 than on node davlcn08
Error: Volume group /dev/vg01 is configured differently on node davlcn08 than on node davlcn05

The server davlcn06 where vg01 is active has 1 alternate link for most disks. One of the servers, causing the errors, davlcn05 has on average 3 alternate links per disk. I need to find out if it is possible to remove the alternate links and if so how to the volume group on davlcn05, without impacting the server where the vg is active.

Thanks

John

[Devender Khatana]

Hi,

For removing the alternate link you need to perform the vgreduce command and that can be only executed when the vg is active. You can not execute this on any node where vg is not active.

Also you should simply change VG configuration on one node and import same configuration on all other nodes while configuring shared VGs as mentioned in the SG manual. I suppode it is not followed.

HTH,
Devender

[John J Burke]

Thanks Devender,

What i need to find out then, is if it is possible to activate the volume group, on davlcn05 where it is currenltly not active, without impacting the cluster i.e. is it possible to change the settings on the volume group on davlcn06 to stop it being in exclusive mode, and then activate it on davlcn05 without impacting the cluster, and then vgreduce the alternate disks. And what steps would i need to be wary of.

John

[Devender Khatana]

Hi,

Cluster can be running usually but the package which is associated with this volume group should not be running while doing these changes on any of the nodes. So first stop the package where it is allready running. Then activate the volume group on the node where you want to remove alternative links from. After that again export it from here and start your package.

HTH,
Devender

[John J Burke]

Thanks for the responses Devendre

I found a solution to what i needed elsewhere. Removing alternate links to a volume group on node where it is inactive in a cluster

for vg01
1. create vgname.dsk file
vgexport -p -s -m /etc/vg01.map -f /etc/vg01.dsk vg01
2.edit vg01.dsk file removing unwanted alternate links.
3. Export vg01
vgexport vg01
4.Recreate directory and group file for volume group
5.Reimport volumegroup using command below
vgimport -m /etc/vg01.map -f /etc/vg01.dsk vg01