startstats

Use the startstats command to modify the interval at which per-node statistics for volumes, managed disks (MDisks), and nodes are collected.

Syntax

startstats -intervaltime_in_minutes

Parameters

-intervaltime_in_minutes: Specifies the time in minutes. This is the time interval between the gathering of statistics, from 1 to 60 minutes in increments of 1 minute.

Description

Running the startstats command will reset the statistics timer to zero (0), and give it a new interval at which to sample. Statistics are collected at the end of each sampling period as specified by the -interval parameter. These statistics are written to a file, with a new file created at the end of each sampling period. Separate files are created for MDisks, volumes and node statistics.

The files generated are written to the /dumps/iostats directory.

A maximum of 16 files are stored in the directory at any one time for each statistics file type, for example:

Nm_stats_nodepanelname_date_time
Nv_stats_nodepanelname_date_time
Nn_stats_nodepanelname_date_time

Statistics files are created for all time intervals. Before the 17th file for each type is created, the oldest file of that type is deleted.

These files can be listed by using the lsdumps command.

The following naming convention is used for these files:

stats_type_stats_nodepanelname_date_time

Where stats_type is Nm for MDisks, Nv for volumes, and Nn for node statistics. nodepanelname is the current configuration node panel name, date is in the format of yymmdd, and time is in the format of hhmmss.

The following is an example of an MDisk statistics file name: Nm_stats_000229_031123_072426

The following is an example of a volume statistics file name: Nv_stats_000229_031123_072426

The following is an example of a node statistics file name: Nn_stats_000229_031123_072426

Statistics are collected for each MDisk and recorded in theNm_stats_nodepanelname_date_time file, including the following statistical information:

The number of SCSI read and write commands that are processed during the sample period
The number of blocks of data that are read and written during the sample period
Per MDisk, cumulative read and write external response times in milliseconds
Per MDisk, cumulative read and write queued response times

Statistics are collected for each volume and recorded in the Nv_stats_nodepanelname_date_timefile, including the following statistical information:

The total number of processed SCSI read and write commands
The total amount of read and written data
Cumulative read and write response time in milliseconds
Statistical information about the read/write cache usage
Global Mirror statistics including latency

Statistics are collected for the node from which the statistics file originated and recorded in the Nn_stats_nodepanelname_date_time file, including the following statistical information:

Usage figure for the node from which the statistic file was obtained
The amount of data transferred to and received from each port on the node to other devices on the SAN
Statistical information about communication to other nodes on the fabric

An invocation example

startstats -interval 25

The resulting output:

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