Raid 1E; Raid 3; Raid 5 - Promise Technology 1000f series Product Manual

RAID 1E

Implemented as a mirrored disk array
whose segments are RAID 0 disk
arrays
High I/O rates are achieved thanks to
multiple stripe segments
Can use an odd number of disks
Recommended Applications for RAID 1E
• Imaging applications
• Database servers
• General file server

RAID 3

Good for large files with high transfer
rates where fault tolerance is also
required
Recommended Applications for RAID 3:
• Video editing
• Multimedia production
• File and Application server

RAID 5

High Read data transaction rate
Medium Write data transaction rate
Good aggregate transfer rate
Recommended Applications for RAID 5
• File and Application servers
• WWW, E-mail, and News servers
Advantages
Advantages
Advantages
Chapter 9: Technology Background
Disadvantages
Very high disk overhead - uses only
50% of total capacity
Disadvantages
Random write performance only fair.
Disk failure has a medium impact on
throughput
Disadvantages
Disk failure has a medium impact on
throughput
• Intranet servers
• Most versatile RAID level
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