Appendix A. Overview Of Ibm System Storage Ds5000 Raid Types; Raid 1: For Availability/Good Read Response Time - IBM Midrange System DS4000 Series Hardware Manual

Midrange system storage ds4000/ds5000 series

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Figure A-1 RAID 0

RAID 1 (Figure A-2) is also known as

require high data availability, good read response times, and where cost is a secondary issue.

The response time for writes can be somewhat slower than for a single disk, depending on

the write policy. The writes can either be executed in parallel for speed or serially for safety.

Select RAID level 1 for applications with a high percentage of read operations and where cost

is not the major concern.

Figure A-2 RAID 1

Because the data is mirrored, the capacity of the logical drive when assigned RAID level 1 is

50% of the array capacity.

disk mirroring

Appendix A. Overview of IBM System Storage DS5000 RAID types

Logical Drive

. It is most suited to applications that

Logical Drive