Promise Technology Network Device EX8650 Manuel d'utilisateur Page 247

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Vue de la page 246
Chapter 7: Technology Background
233
RAID 1E
Recommended Applications for RAID 1E
Imaging applications
Database servers
General fileserver
RAID 5
Recommended applications for RAID 5:
File and Application servers
WWW, E-mail, and News servers
Intranet servers
Advantages Disadvantages
Implemented as a mirrored logical
drive whose segments are RAID 0
logical drives
High I/O rates are achieved thanks to
multiple stripe segments
Can use an odd number of physical
drives
Very high physical drive overhead –
uses only 50% of total capacity
Advantages Disadvantages
High Read data transaction rate
Medium Write data transaction rate
Good aggregate transfer rate
Most versatile RAID level
Physical drive failure has a medium
impact on throughput
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