Fujitsu MPB3043AT, MPB3054AT, MPB3032AT, MPB3052AT, MPB3021AT manual Hap

3)After completion of data transfer of hit data, the disk drive performs the read-ahead operation for the data area of which the disk drive transferred hit data.

HAP

Read-ahead data

DAP

4)Finally, the cache data in the buffer is as follows.

Read-ahead data

Start LBA Last LBA

c.Non-sequential read command just after sequential read command

When non-sequential read command is received after executing the sequential read command (read-ahead operation) and more than ten non-sequential read commands are received after that continuously, the read-ahead operation is stopped (refer to item (1)). Processing is the same as item a. above

(3)Full hit (hit all)

All requested data are stored in the data buffer. The disk drive starts transferring the requested data from the address of which the requested data is stored. After completion of command, a previously existed cache data before the full hit reading are still kept in the buffer, and the disk drive does not perform the read-ahead operation.

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