HP Serviceguard manual Using the Generic Resources Disk Monitor, Using the EMS Disk Monitor

NOTE: The procedures that follow describe the command-line method of configuring LVM storage. There are two other, more automated methods you can use.

•System Management Homepage

You can use the System Management Homepage to create or extend volume groups and create logical volumes. From the System Management Homepage, choose Disks and File Systems. Make sure you create mirrored logical volumes with PVG-strict allocation; see“Using Mirrored Individual Data Disks” (page 179).

When you have created the logical volumes and created or extended the volume groups, specify the file system that is to be mounted on the volume group, then proceed with“Distributing Volume Groups to Other Nodes” (page 181).

•cmpreparestg

You can use cmpreparestg (1m) to accomplish the tasks described under “Creating Volume Groups” (page 179). See “Using Easy Deployment Commands to Configure the Cluster” (page 162) for more information. If you use cmpreparestg, you do not need to perform the procedures that follow, but it is a good idea to read them so that you understand what cmpreparestg does for you. Then proceed to “Making Physical Volume Group Files Consistent” (page 183).

If you have already done LVM configuration, skip ahead to “Configuring the Cluster ” (page 186).

NOTE: The procedures that follow assume you are using LVM rather than LVM 2.0. For information about LVM 2.0 specifically, see the white paper LVM 2.0 Volume Groups in HP-UX 11i v3, which you can find under http://www.hp.com/go/hpux-core-docs.

For more information on using LVM in general, including LVM 2.0, see the Logical Volume Management volume of the HP-UX System Administrator’s Guide at http://www.hp.com/go/ hpux-core-docs. For more information about the tasks covered in this section, see Chapter 3 of that guide, and particularly the section on “Common LVM Tasks”.

Using the Generic Resources Disk Monitor

The Generic Resources Monitoring Service allows you to monitor the health of LVM disks. If you are using LVM, you can configure disk monitoring to detect a failed mechanism by using the disk monitor capabilities of the System Fault Management, available as a separate product, and integrating it in Serviceguard by configuring generic resources in packages. Monitoring can be set up to trigger a package failover or to report disk failure events to Serviceguard by writing monitoring scripts, which can be configured as a service in a package.

Monitoring scripts are user-written scripts that must contain the core logic to monitor a resource and set the status of a generic resource using the generic resource commands, cmgetresource(1m) and cmsetresource(1m).

For more information, see:

•HP-UX WBEM LVM Provider Datasheet at http://www.hp.com/go/hpux-core-docs—>HP-UX 11i Volume Management (LVM/VxVM) Software

•“Using Generic Resources to Monitor Volume Groups” (page 100)

•“Monitoring Script for Generic Resources” (page 390)

•“Getting and Setting the Status/Value of a Simple/Extended Generic Resource” (page 135) and the manpages

Using the EMS Disk Monitor

The Event Monitoring Service HA Disk Monitor allows you to monitor the health of LVM disks. If you intend to use this monitor for your mirrored disks, you should configure them in physical volume

178 Building an HA Cluster Configuration