Compaq Confidential – Need to Know Required
Writer:
Doug Warren
Project:
Compaq TaskSmart N2400 Administration Guide
Comments:
Part Number:
177675-002
File Name:
i-appb.doc
Last Saved On:
2/13/01 2:06 PM
Appendix
B
RAID Levels
Distributed Data Guarding
Distributed data guarding, also called RAID 5, stores parity data across all the
drives in the array. Spreading the parity across all the drives allows more
simultaneous read operations and higher performance than data guarding
(RAID 4). If one drive fails, the controller uses the parity data and the data on
the remaining drives to reconstruct data from the failed drive. RAID 5 allows
the system to continue operating with reduced performance until you replace
the failed drive. If more than one drive fails, RAID 5 also fails, and all data in
the array is lost.