Specifying input to the mmpmon command

The input requests to the mmpmon command allow the system administrator to collect I/O statistics per mounted file system (fs_io_s) or for the entire node (io_s).

The mmpmon command must be run by using root authority. For command syntax, see mmpmon command.

The mmpmon command is controlled by an input file that contains a series of requests, one per line. This input can be specified with the -i flag, or read from standard input (stdin). Providing input by using stdin allows the mmpmon command to take keyboard input or output that is piped from a user script or application.

Leading blanks in the input file are ignored. A line beginning with a pound sign (#) is treated as a comment. Leading blanks in a line whose first nonblank character is a pound sign (#) are ignored.

Table 1 describes the mmpmon command input requests.
Table 1. Input requests to the mmpmon command
Request Description
fs_io_s Display I/O statistics per mounted file system
io_s Display I/O statistics for the entire node
nlist add name[ name...] Add node names to a list of nodes for mmpmon processing
nlist del Delete a node list
nlist new name[ name...] Create a new node list
nlist s Show the contents of the current node list
nlist sub name[ name...] Delete node names from a list of nodes for mmpmon processing
once request Indicates that the request is to be performed only once.
reset Reset statistics to zero
rhist nr Changing the request histogram facility request size and latency ranges
rhist off Disabling the request histogram facility. This is the default.
rhist on Enabling the request histogram facility
rhist p Displaying the request histogram facility pattern
rhist reset Resetting the request histogram facility data to zero
rhist s Displaying the request histogram facility statistics values
rpc_s Displaying the aggregation of execution time for Remote Procedure Calls (RPCs)
rpc_s size Displaying the Remote Procedure Call (RPC) execution time according to the size of messages
source filename Using request source and prefix directive once
ver Displaying mmpmon version
vio_s Displaying vdisk I/O statistics. For more information, see IBM Storage Scale RAID: Administration.
vio_s_reset Resetting vdisk I/O statistics. For more information, see IBM Storage Scale RAID: Administration.