Accusys ExaSAN A12S2-PS, Руководство пользователя

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4. How to Use
User Guide Page 4-12
4.1.6 Preference
4.1.6.1 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.
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.
Note
Although slow responds of some hard disks can be tolerated in
DLP mode, you may use S.M.A.R.T. function to check the
conditions of hard disks in an array and replace the faulty ones.
Note
This function does not support JBOD and NRAID.