Viewing Array And Partition Statistics - Impediment RS-1600-X24 User Manual

3.3.1 Viewing Array and Partition Statistics

You can view the current array and partition rate and cumulative statistics. The following statistics are
available:
• Rate statistics
– I/O operations per second (IOPS)
– Bandwidth (in millions of bytes per second)
• Cumulative statistics
– Number of read operations
– Number of write operations
– Number of sectors (512 bytes) read
– Number of sectors written
– Current command queue depth for each host port
– I/O size for each host port
– Host read/write histogram that shows how many host reads and writes fell into a particular size
range. The I/O ranges are based on powers of two.
Tip: This information may be helpful in interpreting performance based on individual system configuration
such as HBA, driver configuration, SAN configuration, and host operating system configuration. The
statistical information can be useful to profile applications and their usage of an array and partition, which
could be used to determine if additional arrays would increase performance and what RAID level is
applicable to your needs. You may want to analyze the performance of the same application using
different RAID levels to determine which level gives you the best performance. See
Basics", on page 89
Note The statistics are provided as general information for your use, however, they are not intended for
benchmarking purposes.
Similar statistics are also available on an aggregate basis for all arrays. For more information, see.
To view the rate statistics:
• From SAM, select Monitor X24 Subsystem > Statistics > Partition Rate Stats.
To view the cumulative statistics:
• From SAM, select Monitor X24 Subsystem > Statistics > Cumulative Part Stats.
3.3.1.1 Resetting All Statistics
You can reset the following array and partition statistics to zero:
• Read
• Write
• SecRd
• SecWt
• I/O Size
Note Resetting statistics here resets all statistics for the X24 Subsystem.
You may want to reset the statistics if you are monitoring performance. You may also want to reset
statistics when you change how you are using a partition.
for more details on RAID levels.
RAID Management
Appendix A , "Array
21