HP Serviceguard Toolkit for NFS manual IP0=15.13.114.243 SUBNET0=15.13.112.0

Installing and Configuring MC/ServiceGuard NFS

Configuring an MC/ServiceGuard NFS Package

LV[0]="/dev/vx/dsk/dg01/vol01"; FS[0]="/pkg1a"; FS_M

OUNT_OPT[0]="-o rw"

LV[1]="/dev/vx/dsk/dg01/vol02"; FS[1]="/pkg1b"; FS_M

OUNT_OPT[1]="-o rw"

4.Specify the IP address for the package and the address of the subnet to which the IP address belongs:

IP[0]=15.13.114.243

SUBNET[0]=15.13.112.0

The IP address you specify is the relocatable IP address for the package. NFS clients that mount the file systems in the package will use this IP address to identify the server. You should configure a name for this address in the DNS or NIS database, or in the /etc/hosts file.

5.If two packages have the same adoptive node, and you want to prevent the adoptive node from adopting both packages at once, specify the cmmodpkg command with the package control option (-d) in the customer_defined_run_cmds:

function customer_defined_run_cmds

{

cmmodpkg -d -n ‘hostname‘ pkg02 &

}

The package control option can prevent an adoptive node from becoming overloaded when multiple packages fail over. If an adoptive node becomes overloaded, it can fail.

In this example, if a host is an adoptive node for both pkg01 and pkg02, the above cmmodpkg -dcommand, in the control script for pkg01, would prevent the host that is running pkg01 from adopting pkg02. A similar line in the control script for pkg02 could prevent the host that is running pkg02 from adopting pkg01. The ampersand (&) causes the cmmodpkg command to run in the background. It must run in the background to allow the control script to finish bringing up the package. The cmmodpkg command will hang until the package is up, so it must run in the background to allow the control script to complete.

There is a short time, after one package has failed over but before the cmmodpkg command has executed, when the other package can fail over and the host will adopt it. In other words, if two packages fail over at approximately the same time, a host may adopt both packages, even though the package control option is specified.

36 Chapter 2