Dynamic Multi-Pathing 7.3.1 Administrator's Guide - Linux

Displaying statistics for queued or erroneous I/Os

Use the vxdmpadm iostat show command with the -q option to display the I/Os queued in Dynamic Multi-Pathing (DMP) for a specified DMP node, or for a specified path or controller. For a DMP node, the -q option displays the I/Os on the specified DMP node that were sent to underlying layers. If a path or controller is specified, the -q option displays I/Os that were sent to the given path or controller and not yet returned to DMP.

See the vxdmpadm(1m) manual page for more information about the vxdmpadm iostat command.

To display queued I/O counts on a DMP node:

# vxdmpadm -q iostat show [filter] [interval=n [count=m]]

For example:

# vxdmpadm -q iostat show dmpnodename=emc_clariion0_352

cpu usage = 338us    per cpu memory = 102400b
                        QUEUED I/Os     PENDING I/Os
DMPNODENAME          READS    WRITES
emc_clariion0_352    0        0         0

To display the count of I/Os that returned with errors on a DMP node, path, or controller:

# vxdmpadm -e iostat show [filter] [interval=n [count=m]]

For example, to show the I/O counts that returned errors on a path:

# vxdmpadm -e iostat show pathname=sdo

cpu usage = 637us    per cpu memory = 102400b
                  ERROR I/Os
PATHNAME      READS    WRITES
sdo           0         0