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DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
Monitoring System Status
E.7 Displaying Overall Statistics
You can display two types of aggregate statistics for all partition LUNs:
• General statistics (Similar statistics are also available for individual
partition LUNs. For more information, see section D.3.2.2, "Viewing
Partition Statistics" on page 239.)
- I/O operations per second (IOPS)
- Bandwidth (in millions of bytes per second)
- Number of read operations
- Number of write operations
- Total sectors (512 bytes) 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
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 a partition, which could be used to
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