Dell PowerVault 221S (SCSI) - Manual (Page 9)

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02
PAGE 9 11/17/2005
• RAID 5 – Recommended for web servers 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.
• RAID 0 – Recommended for solutions where web server will be part of a group of
web servers that service a large internet portal and performance is the highest
concern. In this situation, availability and redundancy is handled by the cluster
group and does not need to happen at the disk level.
• RAID 1 – Good solution for small websites which do not require high storage
capacity.
Not recommended:
• Concatenated - This solution is not recommended due to lack of redundancy and
data protection
Note: While this configuration is not recommended, it can be configured and utilized.
Online Transaction Processing Servers
Online Transaction Processing (OLTP) oriented servers are used in a number of
industries for the entry and retrieval of transactions for example, OLTP is common in
banking, airlines, mail-order, and supermarkets. They are generally mission critical
servers that require the maximum availability and redundancy possible.
• Table 2-9: OLTP General IO profile
I/O Profile
(Read/Write)
I/O Profile
(Sequential/Random)
Bandwidth IO Size
Latency
Sensitivity
Growth
Rate
Criticality
80/20 Random Moderate 2k-8k Moderate Low High
• Table 2-10: OLTP RAID Guidelines
RAID Level
Application
Concatenated 0 1 10 5 50
OLTP
Recommended Not Recommended Possible
Recommended:
• RAID 10 – Since OLTP systems are very critical for most business, this RAID
configuration is highly recommended due to the high availability and
redundancy and good performance.
• RAID 5 – Recommended for OLTP servers that require maximum storage
capacity and only base data protection and performance.