Dell PowerVault 221S (SCSI) - Manual (Page 8)

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02
PAGE 8 11/17/2005
• RAID 5 – Recommended for databases that require maximum storage capacity
and only base data protection and performance.
• RAID 50 – Recommended for those solutions that require a balance between
storage capacity and performance.
Possible:
• RAID 1 – Possible solution for small databases which do not require high storage
capacity.
Not recommended:
• RAID0, 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 moderate intranet sites
with minimal traffic 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 a concern. For large web sites, usually there
are 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 2-7: Web General IO profile
I/O Profile
(Read/Write)
I/O Profile
(Sequential/Random)
Bandwidth IO Size
Latency
Sensitivity
Growth
Rate
Criticality
95/5 Random Moderate < 64K Moderate Low High
• Table 2-8: Web RAID Guidelines
RAID Level
Application
Concatenated 0 1 10 5 50
Database
Recommended Not Recommended Possible
Recommended:
• RAID 10 – Recommended for enterprise web server solutions where availability
and redundancy and performance are the highest priority, usually stand-alone
portal sites that is critical to the organization’s business.