Avago Technologies 3ware SAS 9750-4i - Manual (Page 77)

Controller Object Commands
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For a description of each of the statistics that can be gathered and viewed, see
“/cx/px show dpmstat type=inst|ra|lct|histdata|ext” on page 110.
DPM is disabled by default since there is overhead in maintaining the
statistics. DPM is also disabled following a reboot or power-on.
Note that turning off DPM does not clear the statistical data that has been
recorded. To clear the data, use the command “/cx/px set dpmstat=clear
[type=ra|lct|ext]” on page 114.
For more information, see “Drive Performance Monitoring” on page 241 of
the 3ware SATA+SAS RAID Controller Card Software User Guide, Version
10.0.
Example:
//localhost> /c0 set dpmstat=off
Setting Drive Performance Monitoring on /c0 to [off]... Done.
/c x set rebuild=enable|disable|1..5
This command enables or disables the Rebuild Task Schedule defined for
controller /cx and sets the priority of rebuild versus I/O operations. When
enabled, rebuild tasks will only be run during the time slots scheduled for
rebuilds. If a rebuild is taking place when the schedule is enabled, it will be
paused until the next scheduled time.
The priority of rebuild versus I/O operations is specified with 1..5, where 5 is
more resources and 1 the least. Setting the value to 5 gives maximum
processing time to rebuilds rather than I/O. Setting the value to 1 gives
maximum processing time to I/O rather than rebuilds.
5 = fastest rebuild; slowest I/O
4 = faster rebuild; slower I/O
3 = balanced between rebuild and I/O
2 = faster I/O; slower rebuild
1 = fastest I/O; slowest rebuild
Enabling and disabling rebuild schedules is only for 9000 series controllers,
however the rebuild rate (1..5) applies to all controllers.
7000- and 8000-series controllers have only one setting for Task Rate; it
applies to both rebuild and verify rates. This rate is not persistent following a
reboot for 7000- and 8000-series controllers.