Managing Serviceguard Eighteenth Edition, September 2010

• A lock LUN cannot also be used in an LVM physical volume or VxVM or CVM

disk group.

• A lock LUN cannot be shared by more than one cluster.

• A lock LUN cannot be used in a dual-lock configuration.

• You do not need to back up the lock LUN data, and in fact there is no way to do

so.

A lock LUN needs only a small amount of storage, about 100 KB.

• If you are using a disk array, create the smallest LUN the array will allow, or, on

an HP Integrity server, you can partition a LUN; see “Creating a Disk Partition on

an HP Integrity System”.

• If you are using individual disks, use either a small disk, or a portion of a disk. On

an HP Integrity server, you can partition a disk; see “Creating a Disk Partition on

an HP Integrity System”.

IMPORTANT: On HP 9000 systems, there is no means of partitioning a disk or

LUN, so you will need to dedicate an entire small disk or LUN for the lock LUN.

This means that in a mixed cluster containing both Integrity and HP-PA systems,

you must also use an entire disk or LUN; if you partition the device as described

below, the HP-PA nodes will not be able to see the partitions.

Creating a Disk Partition on an HP Integrity System

You can use the idisk utility to create a partition for a lock LUN in a cluster that will

contain only HP Integrity servers. Use the procedure that follows; see the idisk (1m)

manpage for more information. Do this on one of the nodes in the cluster that will use

this lock LUN.

CAUTION: Before you start, make sure the disk or LUN that is to be partitioned has

no data on it that you need. idisk will destroy any existing data.

1. Use a text editor to create a file that contains the partition information. You need

to create at least three partitions, for example:

EFI 100MBHPUX 1MB

HPUX 100%

This defines:

• A 100 MB EFI (Extensible Firmware Interface) partition (this is required)

• A 1 MB partition that can be used for the lock LUN

• A third partition that consumes the remainder of the disk is and can be used

for whatever purpose you like.

2. Save the file; for example you might call it partition.txt.

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