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 using root authority. . For command syntax, see mmpmon 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 using stdin allows mmpmon to take keyboard input or output 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 non-blank character is a pound sign (#) are ignored.

Table 1 describes the mmpmon 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. See IBM Spectrum Scale RAID: Administration for more information.
vio_s_reset	Resetting vdisk I/O statistics. See IBM Spectrum Scale RAID: Administration for more information.