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This is because each sector written from the host results in a write to
each mirrored disk. In RAID 5 arrays, each write from the host can
generate up to two disk reads and two disk writes. Because the
controller has cache memory, the reported number of sectors read
from or written to disk may be less than this value. I/O statistics are
displayed in the Hard Drive I/O Statistics window, as shown in
Figure
3-25.
Figure 3-25. Hard Drive I/O Statistics Window
The Hard Drive I/O Statistics window displays the following
information:
I/O
Commands
Total Sectors
Cache Hits
The number of Read and Write commands issued by
the computer to the controller. If you use RAID and
caching, the number of commands issued to the
drives can differ significantly from this value.
The total number of sectors read and written from
the host computer.
The total number of sectors (read or written from
the host computer) that were found in the controller
cache and did not require a disk access.
Storage Manager
3-52
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