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

# vxdmpadm listenclosure all
ENCLR_NAME ENCLR_TYPE ENCLR_SNO STATUS
============================================================
other0 OTHER OTHER_DISKS CONNECTED
jbod0 X1 X1_DISKS CONNECTED
GRP1 ACME 60020f20000001a90000 CONNECTED
Configuring the response to I/O failures
You can configure how DMP responds to failed I/O requests on the paths to a
specified enclosure, disk array name, or type of array. By default, DMP is configured
to retry a failed I/O request up to 5 times for a single path.
To display the current settings for handling I/O request failures that are applied
to the paths to an enclosure, array name or array type, use the vxdmpadm getattr
command.
See “Displaying recovery option values” on page 188.
To set a limit for the number of times that DMP attempts to retry sending an I/O
request on a path, use the following command:
# vxdmpadm setattr \
{enclosure enc-name|arrayname name|arraytype type} \
recoveryoption=fixedretry retrycount=n
The value of the argument to retrycount specifies the number of retries to be
attempted before DMP reschedules the I/O request on another available path, or
fails the request altogether.
As an alternative to specifying a fixed number of retries, the following version of
the command specifies how long DMP should allow an I/O request to be retried
on a path:
# vxdmpadm setattr \
{enclosure enc-name|arrayname name|arraytype type} \
recoveryoption=timebound iotimeout=seconds
The value of the argument to iotimeout specifies the time in seconds that DMP
waits for an outstanding I/O request to succeed before it reschedules the request
on another available path, or fails the I/O request altogether. The effective number
of retries is the value of iotimeout divided by the sum of the times taken for each
retry attempt. DMP abandons retrying to send the I/O request before the specified
time limit has expired if it predicts that the next retry will take the total elapsed
time over this limit.
185Administering Dynamic Multipathing
Administering DMP using vxdmpadm