HP 2000sa RAID 6 with HP Advanced Data Guarding technology: a cost-effective,
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- HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 1
HP Advanced Data Guarding technology: a cost-effective, fault-tolerant solution technology brief Abstract...2 Introduction...2 Functions and limitations of RAID schemes 3 Fault tolerance of RAID schemes ...5 Cost-effectiveness of RAID schemes ...7 Performance of RAID schemes ...8 Choosing a RAID - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 2
that of other RAID levels, depends on the nature of the application. Organizations implementing a large drive array should consider RAID 6 because it efficient use of storage capacity, and high performance. Organizations implementing a large storage array should consider an HP RAID 6 solution because - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 3
two sets of drives. It is used in applications that require very high availability. RAID 1 has high fault tolerance, but it has low storage efficiency because it requires twice the number of drives required for RAID 0. RAID 1+0 is implemented as a striped array of mirrored drives. It is best suited - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 4
array. Provides higher fault tolerance than RAID 5. For 24x7 applications that require a higher level of fault tolerance than RAID 5. Potentially risky for large arrays. Can only withstand the loss of one drive without total array failure. Low write performance (improved with battery-backed cache - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 5
more hard drives. For arrays of more than 14 drives, HP recommends RAID 6 for its fault tolerance and storage efficiency. RAID 6 can effectively protect an array containing the maximum number of drives supported by a variety of Smart Array Controllers. Controller specifications are available online - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 6
Figure 1. Failure probability for logical drives with four RAID levels and varying numbers of drives in the array 6 - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 7
to 93 percent for 14 drives (the maximum recommended by HP). The storage efficiency of RAID 6 varies from 50 percent for four drives to 96 percent for specific storage systems. The maximum number of physical drives that each HP Smart Array controller can support is identified on this web page: www - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 8
Summary of RAID array storage efficiency* Usable Capacity (C = capacity of smallest drive; n = number of drives) Minimum number of drives Recommended maximum number of drives* Storage efficiency from minimum to recommended maximum number of drives** RAID 1 C*(n/2) 2 N/A 50% RAID 1+0 C*(n/2) RAID - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 9
to protect enterprise data at a lower cost than RAID 1 arrays and when performance is not an overriding factor. RAID 6 can effectively protect an array of up to the maximum number of drives supported by a variety of Smart Array Controllers. A RAID 6 array can tolerate up to two simultaneous drive - HP 2000sa | RAID 6 with HP Advanced Data Guarding technology: a cost-effective, - Page 10
, please send comments about this paper to: [email protected]. © 2002, 2005 Hewlett-Packard Development Company HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP
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RAID 6 with HP Advanced Data Guarding technology:
a cost-effective, fault-tolerant solution
technology brief
Abstract
..............................................................................................................................................
2
Introduction
.........................................................................................................................................
2
Functions and limitations of RAID schemes
..............................................................................................
3
Fault tolerance of RAID schemes
............................................................................................................
5
Cost-effectiveness of RAID schemes
........................................................................................................
7
Performance of RAID schemes
...............................................................................................................
8
Choosing a RAID level
.........................................................................................................................
9
Summary
............................................................................................................................................
9
Call to action
....................................................................................................................................
10