LSI 3ware SAS 9750-8i Betriebsanweisung PDF herunterladen (Seite 124)

Configuring Units

112 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.0

locally on the controller with the anticipation that it may be requested by the

host. For example, the host may read blocks 1, 2, and 3. With the read-ahead

caching included in IRP, the controller will also retrieve and hold in its cache

blocks 4, 5, and 6 in anticipation of getting those command requests from the

host. By loading a larger set of data into the cache, chances are improved that

another request can be filled by data that is already in the cache. This can be

helpful with applications that are sequential in nature, such as video on

demand, video surveillance playback, and restoring from a disk-to-disk

backup. Performance benefits of read-ahead are especially pronounced when

the host queue depth is low. In addition, this read-ahead caching also

improves sequential read performance when the unit is degraded.

The Intelligent Read Prefetch (IRP) feature also includes an intelligent and

adaptive stream management layer to improve performance at higher queue

depth in multiple read only or mixed read/write stream environments. The

performance improvements should be seen for most RAID types regardless of

the unit’s operational state (normal, degraded, and so forth).

Note that if Intelligent Mode is enabled, the features in Basic mode are also

enabled.

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LSI 3ware SAS 9750-8i Betriebsanweisung Seite 124