Dell PowerVault MD1000 SAS Solution Podręcznik - Strona 29
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A REFERENCE GUIDE FOR OPTIMIZING DELL™ MD1000 SAS SOLUTIONS
Table 9: Web RAID Guidelines
Application
Database
Recommended:
RAID 10 – Recommended for enterprise web server solutions where availability and
•
redundancy and performance are the highest priority, usually for stand-alone portal sites
that are critical to the organization's business.
RAID 5 – Recommended for web servers that require maximum storage capacity and
•
moderate 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 the 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 are addressed by the cluster group and do not need
to occur 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.
Database or Online Transaction Processing Servers
Database servers can range from simple workgroup databases like Microsoft
hundred users to mission-critical enterprise databases like Oracle or SQL Server with thousands of
users. Database applications will always benefit from some data protection while other
requirements such as performance and availability will vary. As a general rule, the more critical the
database, greater is the need for data protection. Additionally, the performance requirements
increase relative to the number of users accessing the database.
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. These servers are generally mission-critical and require maximum availability
and redundancy possible.
Table 10: Database or OLTP General IO profile
I/O Profile
(Read/Write)
80/20
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RAID Level
Concatenated
0
Recommended
I/O Profile
(Sequential/Random)
Random
1
10
Not Recommended
I/O
Latency
Bandwidth
Size
Sensitivity
Moderate
8k
Moderate
VER A00
5
50
Possible
®
Access with a few
Growt
Criticality
h Rate
Low
High
5/06/2005