Use the startstats command to modify the interval at which
per-node statistics for volumes, managed disks (MDisks), and nodes are
collected.
Syntax
startstats -interval time_in_minutes
Parameters
- -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.
Description
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_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:
- 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
An invocation example
startstats -interval 25
The resulting output:
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