vxdmpadm setmpioparam
Prev vxdmpadm Next

vxdmpadm setmpioparam

vxdmpadm setmpioparam [default] |[PathVerifyEnabled=0|1] [PathVerificationPeriod=#][PDORemovePeriod=#] [RetryCount=#] [RetryInterval=#] [dsmName=ALL | <DsmFileName>]

This command enables changing MPIO timer parameters or restoring default MPIO timer parameters.

Warning:

Veritas DSMs always use the default MPIO timer parameters. Therefore, this command should be used only when Microsoft has advised to change the settings for debugging purposes. Attempting to change these MPIO parameters would affect the behavior of a DSM for I/O error, path failover, and DSM performance.

default

Restores the default settings of these MPIO parameters

PathVerifyEnabled=0|1

Default: 0 (not enabled)

If enabled (value 1) MPIO performs path verification every N seconds where N is the value set in PathVerificationPeriod.

PathVerificationPeriod=#

# specifies the amount of time MPIO performs the path verification, if path verification is enabled. Default: 30 seconds. Maximum value: MAXULONG.

PDORemovePeriod=#

# specifies the amount of time an MPIO pseudo LUN, which represents a disk under MPIO control, stays in memory after all paths of a disk have been removed from the system. It also specifies how long the pending I/O should fail after all paths have been removed from a disk. Default: 20 seconds. Maximum value: MAXULONG.

RetryCount=#

# specifies the number of times DSM asks MPIO to retry the I/O when an I/O error occurs. Default: 3. There is no maximum value.

RetryInterval=#

# specifies the amount of time MPIO should retry a failed I/O. Default: 1 second.

dsmName = ALL |<DsmFileName>

Specifies whether to apply these settings to all installed DSMs or only to the DSM specified by file name.

Note:

You can use the vxdmpadm getdsmattrib command if you want to find out the file names of installed DSMs.
Prev Up Next
vxdmpadm getmpioparam Home Performance tuning