Dell POWERVAULT MD1000 - Manual (Page 28)

A REFERENCE GUIDE FOR OPTIMIZING DELL™ MD1000 SAS SOLUTIONS VER A00
PAGE 28 5/06/2005
Table 7: Email Sever RAID Guidelines
RAID Level
Application
Concatenated 0 1 10 5 50
E-Mail
Recommended Not Recommended Possible
Recommended:
• RAID 10 – Recommended for mission-critical e-mail servers where availability and
redundancy and/or performance are the highest priority and where reduced storage
capacity is acceptable.
• RAID 5 – Recommended for e-mail servers that require maximum storage capacity and
moderate data protection and performance.
• RAID 50 – Recommended for those solutions that require greater redundancy and data
protection and a balance between storage capacity and performance.
Possible:
• RAID 1 – Possible solution for small e-mail servers which do not require high storage
capacity.
Not recommended:
• RAID 0, Concatenated – Not recommended due to lack of redundancy and data
protection.
Note: While these configurations are not recommended, they can be configured and
utilized.
Web Servers
Web severs are usually high traffic systems where read operations are the most common disk
activity as web pages are requested by users. They can be intranet sites with minimal internal
company traffic or global internet portal sites that receive hundreds of thousands of users daily.
Performance is generally the main concern with redundancy and data protection being less of a
concern. For large web sites, there are usually several web servers responding to client requests
and as a result the need for redundancy and data protection is not as important. Also web servers
may not require as much scalability or disk capacity since website content is relatively static and
changes are usually minor content modifications.
Table 8: Web General IO profile
I/O Profile
(Read/Write) I/O Profile
(Sequential/Random)
Bandwidth
I/O
Size Latency
Sensitivity Growt
h Rate
Criticality
95/5 Random Moderate < 64k Moderate Low High