Managing HP Serviceguard for Linux, Eighth Edition, March 2008

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5 159
CAUTION The minor numbers used by the LVM volume groups must be the same
on all cluster nodes. This means that if there are any non-shared volume
groups in the cluster, create the same number of them on all nodes, and
create them before you define the shared storage.
NOTE Except as noted in the sections that follow, you perform the LVM
configuration of shared storage on only one node. The disk partitions
will be visible on other nodes as soon as you reboot those nodes. After
you’ve distributed the LVM configuration to all the cluster nodes, you
will be able to use LVM commands to switch volume groups between
nodes. (To avoid data corruption, a given volume group must be active on
only one node at a time).
For multipath information, see “Multipath for Storage” on page 99.
Displaying Disk Information
To display a list of configured disks, use the following command:
fdisk -l
You will see output such as the following:
Disk /dev/sda: 64 heads, 32 sectors, 8678 cylinders
Units = cylinders of 2048 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1001 1025008 83 Linux
/dev/sda2 1002 8678 7861248 5 Extended
/dev/sda5 1002 4002 3073008 83 Linux
/dev/sda6 4003 5003 1025008 82 Linux swap
/dev/sda7 5004 8678 3763184 83 Linux
Disk /dev/sdb: 64 heads, 32 sectors, 8678 cylinders
Units = cylinders of 2048 * 512 bytes
Device Boot Start End Blocks Id System
Disk /dev/sdc: 255 heads, 63 sectors, 1106 cylinders
Units = cylinders of 16065 * 512 bytes