Accusys ExaSAN B08S2-PS - Manual (Page 71)

4. How to Use
User Guide Page 4-20
4.1.2.7 Preference Setting
This menu allows administrators to set the conditions of the controller, such as performance modes,
caching, and miscellaneous functions.
4.1.2.7.1 Mode
Figure 58: GUI “Mode setting”
Disk Lag Proof Mode – This feature ensures the stability and continuity of the RAID performance. In
RAID 5 and RAID 6, DLP prevents the aging or slow responds of a single hard disk from influencing the
overall performance. The advantage of this feature will not be felt until some hard disks fail to perform
well.
Figure 59: DLP concept
In the event of performance degradation or delay of a single drive due to aging, the ExaSAN RAID
system reads both data and parity stripes concurrently. It bypasses the slow reads and returns data to the
host with the regenerated data and to provide stabled performance based on the RAID parity.