Managing Serviceguard A.11.20, March 2013

NOTE: Do this during this setup process only, so that activation and mounting can be done by
the package control script at run time. You do not need to deactivate and unmount a volume simply
in order to create a map file (as in step 1 of the procedure that follows).
Distributing the Volume Group
NOTE: If you use cmpreparestg, you can skip the procedure that follows and proceed to
“Making Physical Volume Group Files Consistent” (page 187).
Use the following commands to set up the same volume group on another cluster node. In this
example, the commands set up a new volume group on ftsys10 which will hold the same physical
volume that was available on ftsys9. You must carry out the same procedure separately for each
node on which the volume group's package can run.
To set up the volume group on ftsys10, use the following steps:
1. On ftsys9, copy the mapping of the volume group to a specified file.
vgexport -p -s -m /tmp/vgdatabase.map /dev/vgdatabase
2. Still on ftsys9, copy the map file to ftsys10:
rcp /tmp/vgdatabase.map ftsys10:/tmp/vgdatabase.map
3. On ftsys10, create the volume group directory:
mkdir /dev/vgdatabase
4. Still on ftsys10, create a control file named group in the directory /dev/vgdatabase,
as follows:
mknod /dev/vgdatabase/group c 64 0xhh0000
Use the same minor number as on ftsys9. Use the following command to display a list of
existing volume groups:
ls -l /dev/*/group
5. Import the volume group data using the map file from node ftsys9. On node ftsys10,
enter:
vgimport -s -m /tmp/vgdatabase.map /dev/vgdatabase
Note that the disk device names onftsys10 may be different from their names on ftsys9.
Make sure the physical volume names are correct throughout the cluster.
When the volume group can be activated on this node, perform a vgcfgbackup. (This backup
will be available in the unlikely event that a vgcfgrestore must be performed on this node
because of a disaster on the primary node and an LVM problem with the volume group.) Do
this as shown in the example below:
vgchange -a y /dev/vgdatabase
vgcfgbackup /dev/vgdatabase
vgchange -a n /dev/vgdatabase
6. If you are using mirrored individual disks in physical volume groups, check the /etc/lvmpvg
file to ensure that each physical volume group contains the correct physical volume names for
ftsys10.
186 Building an HA Cluster Configuration