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

- -intervaltime_in_minutes
- (Required) Specifies the time in minutes. This time interval is the interval between the gathering of statistics, 1 - 60 minutes in increments of 1 minute.

Running the startstats command resets the statistics timer to zero, 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_timeNv_stats_nodepanelname_date_timeNn_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:

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

This an example of:

- An MDisk statistics file name:
`Nm_stats_000229_031123_072426` - A volume statistics file name:
`Nv_stats_000229_031123_072426` - A node statistics file name:
`Nn_stats_000229_031123_072426`

Statistics are collected for each MDisk and recorded in the
Nm_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 is 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_time` file, 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 or write cache usage
- Mirroring statistics that include latency

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

- The usage figure for the node from which the statistic file was obtained
- The amount of data that is transferred to and received from each port on the node to other devices on the SAN
- Any statistical information about communication to other nodes on the fabric

startstats -interval 25

The resulting output:

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