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Monitoring System Status
5-11
Displaying Overall Statistics
You can display two types of aggregate statistics for all array LUNs:
!
General statistics (Similar statistics are also available for individual array
LUNs. For more information, see
Viewing Array Statistics
on page 4-10.)
– I/O operations per second (IOPS)
– Bandwidth (in millions of bytes per second)
– Number of read operations
– Number of write operations
– Total sectors (512 byte) read
– Total sectors written
– Total current command queue depth across all LUNs
!
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:
– 1 Sector
– 2-3 Sectors
– 4-7 Sectors
– 8-15 Sectors
– 16-31 Sectors
– 32-63 Sectors
– 64-127 Sectors
– 128-255 Sectors
– 256-511 Sectors
– 512-1023 Sectors
– 1024-2047 Sectors
– 2048 (and larger) Sectors
This information may be helpful in interpreting performance based on individual
system configurations and operating systems. The information displayed here can be
useful to profile applications and their usage of the array and what type of RAID level
is applicable to your needs.