Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

# vxdmpadm setattr \
{enclosure enc-name|arrayname name|arraytype type} \
recoveryoption=nothrottle
The following example shows how to disable I/O throttling for the paths to the
enclosure enc0:
# vxdmpadm setattr enclosure enc0 recoveryoption=nothrottle
The vxdmpadm setattr command can be used to enable I/O throttling on the paths
to a specified enclosure, disk array name, or type of array:
# vxdmpadm setattr \
{enclosure enc-name|arrayname name|arraytype type}\
recoveryoption=throttle {iotimeout=seconds|queuedepth=n}
If the iotimeout attribute is specified, its argument specifies the time in seconds
that DMP waits for an outstanding I/O request to succeed before invoking I/O
throttling on the path. The default value of iotimeout is 10 seconds. Setting
iotimeout to a larger value potentially causes more I/O requests to become queued
up in the SCSI driver before I/O throttling is invoked.
If the queuedepth attribute is specified, its argument specifies the number of I/O
requests that can be outstanding on a path before DMP invokes I/O throttling.
The default value of queuedepth is 20. Setting queuedepth to a larger value allows
more I/O requests to become queued up in the SCSI driver before I/O throttling
is invoked.
Note: The iotimeout and queuedepth attributes are mutually exclusive.
The following example sets the value of iotimeout to 60 seconds for the enclosure
enc0:
# vxdmpadm setattr enclosure enc0 recoveryoption=throttle \
iotimeout=60
The next example sets the value of queuedepth to 30 for the paths to all
Active/Active arrays:
# vxdmpadm setattr arraytype A/A recoveryoption=throttle \
queuedepth=30
Specify recoveryoption=default to reset I/O throttling to the default settings,
as follows:
187Administering Dynamic Multipathing
Administering DMP using vxdmpadm