disks handled by SG

[Jannik]

How can i see the disks handled by SG. I could login to the active node and see it. But how can i get the information out of the SG configuration.

This is to make sure i don't have any unused disks in the system. And disks handled by SG is shown as unused by LVM on a inactive cluter node.

[Rita C Workman · Accepted solution]

The control script.

Rita

[Patrick Wallek]

SG does not really handle disks. It deals with VGs.

Each package generally has its own VG or VGs that it activates and mounts filesystems from when the package starts.

Your best bet would be to look through the configuration for each package and not down the VGs used. The do a 'strings /etc/lvmtab' and note the disk devices used by each VG. You could then compare that list to your 'ioscan -kfnC disk' output to see any "extra" disks on each system.

[IT_2007]

Your question is not clear.

Disks are shared between nodes in cluster other than vg00 disks.

If node1 is active then you can see disks are writable under node1. At the same time, node2 doesn't have access to the same volume group which is defined in cluster config.

If you want to see any unused disks then compare your /etc/lvmtab to "sympd list" for EMC disks.

[Duncan Edmonstone]

Jannik,

strings /etc/lvmtab

will show all the disks used by LVM, even if the VG they are in is not currently active on that node.

HTH

Duncan

[Victor Fridyev]

Hi,

SG works with volume groups as it mantioned above. In order to see used volume groups, look at the cluster *.ascii file. The groups are listed at the end of the file.
Also you can llok at all *cntl files:

find /etc/cmcluster -name "*.cntl" -exec grep VG\[ {} \; |grep -v ^#

Both these ways give you list of volume groups. The next stage is :
strings /etc/lvmtab , in order to see appropriate disks

HTH

[Stephen Doud]

There is no single command available to identify the disks that are governed by Serviceguard.

To identify them, use with 'cmgetconf, which will survey the disks, and recreate a cluster configuration file with a list of LVM volume groups that have the cluster ID on them. Then use 'strings /etc/lvmtab' on each server to locate the /dev/dsk paths to the disks operated by each volume group.

If the /etc/lvmtab is not current and does not describe all volume groups managed by Serviceguard, then it is more difficult to identify which disks has Serviceguard structures on them. If you have this situation, open a case with an HP Support Center and discuss the capabilites of the 'lvm' command to divulge the cluster-related information contained in the VGDA on a disk.

[Kevin Wright]

If you cluster is setup right, all cluster VG's should be set to not be activated in /etc/lvmconf. Otherwise, grep for the VG's in your package directories under /etc/cmcluster.

[Kevin Wright]

make that /etc/lvmrc... sorry.

[sajeer_2]

To see the disks connected to system,
#ioscan -fnC disk

To see the disks configured using lvm,
#strings /etc/lvmtab

To See the VGs using in cluster,
check the cluster ASCII file and also check package control scripts.

[Vivek Pendse]

you will get it in the package control scripts.
Vivek Pendse

[Mauro Gatti]

In the LVM header area you can find the cluster ID of the cluster to which the volume group belongs.
Tro to check
echo "0x12080?8x"|adb /dev/dsk/cXtYdZ
You should look for an "1" that means the vg was marked using "vgchange -c y" command.

RGDS

Mauro

[Lakshmikanth Baddam]

Hi Jannik,

You can view all the VG, LVM, which are part pf cluster in cd /etc/cmcluster/PKG/PKG.cntl


LK

[Jannik]

Thanks all.
I will build a script to handle it. I will go though all the answers in that process and assign point acording to the usefullness :-).