Adaptec 2100S - SCSI RAID Controller Uživatelská příručka stáhnout pdf (Strana 97)

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Storage Manager

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

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.

Total Sectors The total number of sectors read and written from

the host computer.

Cache Hits 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.

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Adaptec 2100S - SCSI RAID Controller Uživatelská příručka Strana 97