SmartStor NS4600 Product Manual - Promise Technology, Inc.
SmartStor NS4600 Product Manual - Promise Technology, Inc.
SmartStor NS4600 Product Manual - Promise Technology, Inc.
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RAID 5<br />
Recommended applications for RAID 5:<br />
• File and Application servers<br />
• WWW, E-mail, and News servers<br />
• Intranet servers<br />
RAID 10<br />
Recommended applications for RAID 10:<br />
• Imaging applications<br />
• Database servers<br />
• General fileserver<br />
Spare Drive<br />
177<br />
Chapter 8: <strong>Technology</strong> Background<br />
Advantages Disadvantages<br />
High Read data transaction rate<br />
Medium Write data transaction rate<br />
Good aggregate transfer rate<br />
Most versatile RAID level<br />
Disk failure has a medium impact on<br />
throughput<br />
Advantages Disadvantages<br />
Implemented as a mirrored RAID<br />
Volume whose segments are RAID 0<br />
RAID Volumes<br />
High I/O rates are achieved thanks to<br />
multiple stripe segments<br />
Very high disk overhead – uses only<br />
50% of total capacity<br />
A spare is a disk drive that has been designated to replace a failed disk drive in a<br />
RAID Volume. In the event of the failure of a disk drive within a RAID 1 or threedrive<br />
RAID 5 Volume, the spare drive is activated as a member of the RAID<br />
Volume to replace a disk drive that has failed.<br />
A spare drive cannot replace the failed drive in a RAID 0 Volume because of the<br />
way in which data is written to the disk drives under RAID 0.<br />
A spare drive is not available for a RAID 10 Volume because RAID 10 requires all<br />
four disk drives in the <strong>SmartStor</strong> enclosure. However, when you replace the failed<br />
disk drive, the <strong>SmartStor</strong> will automatically rebuild the RAID Volume using the<br />
new disk drive.