| Viewing access statistics | |
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Statistic | Description | |
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Total Read Commands | This is a count of the total number of read accesses that | |
Since Reset | have occurred since the statistics were reset or the | |
| controller was last powered on. | |
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Total Read Transfer Since | This is a count of the total number of | |
Reset | that have been read since the statistics were reset or | |
| the controller was last powered on. | |
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Alignment | This is the percentage of commands whose address is | |
| aligned on the specified address boundary. The | |
| alignment of a command from a host system is | |
| determined by the command’s address. In an optimal | |
| system, a write of one chunk of data would reside | |
| exactly within a chunk on one disk. However, if this is | |
| not the case, this write will be split up into two separate | |
| writes to two different data drives. This of course will | |
| have a negative effect on performance. To overcome | |
| these problems, you can, with more sophisticated | |
| operating systems, set the access size and alignment | |
| to an optimal value. These statistics can help you to | |
| tune the operating system. | |
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