Veritas Powerfail Timeout Setting in HP Unix

Veritas Powerfail Timeout setting (vxpfto or pfto) for HP-UX on a Storage Area Network environment

Volume Manager uses TIMEOUT in its Powerfail Timeout (pfto) feature.
You can specify a timeout value for individual Volume Manager disks using the vxdisk command.

What is vxpfto or pfto?
pfto (Individual Volume Manager disks):


EXAMPLES

Use the following command to set the value of pfto to 60 seconds on disk01:
vxdisk set disk01 pfto=60

vxpfto (All disks in a volume or disk group):
Powerfail Timeout is an attribute of a SCSI disk connected to an HP-UX host.
The vxpfto command sets the Powerfail Timeout interval on a set of Volume Manager disks, either all disks in a disk group, or all disks underlying the volumes listed.

EXAMPLES
Set the pfto value on all disks in disk group testdg to 100 seconds:
vxpfto -t 180 -g testdg

Set the pfto value to 50 seconds on all disks underlying volume01 and volume02 in disk group testdg:
vxpfto -t 50 -g testdg volume01 volume02

Set the pfto value to 300 seconds on all disks underlying volume01 and volume02, though they are not in the same disk group:
vxpfto -t 300 volume01 volume02


How to review the setting of the Powerfail Timeout value:
Use either of the following commands to display the pfto/vxpfto value on the Volume Manager disk (look for "timeout" value):

vxdisk list
vxprint -l


Are the Powerfail Timeout values persistent during reboots?
pfto/vxpfto values are persistent across reboots, that is, after the pfto/vxpfto value is set, it remains in effect until you explicitly change it. If dynamic multipathing is enabled, the pfto/vxpfto value set on a disk applies to each path of a multipath disk device.


What is the default value for the pfto/vxpfto setting?
The pfto/vxpfto value is in seconds. If pfto/vxpfto is not specified, or is zero, the timeout period is 30 seconds. Both the vxdisk and vxprint commands display the current pfto value for a disk.


What should the pfto/vxpfto setting be in a SAN environment?
Changing the Powerfail Timeout to 180 is recommended to keep disks from failing over to an alternate link when the disk has not failed.

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