Dell PowerVault 221S (SCSI) - Manual (Page 10)

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02
PAGE 10 11/17/2005
• RAID 50 – Recommended for those solutions that require a balance between
storage capacity and performance.
Possible:
• RAID 1 – Possible solution for situations which do not require high storage
capacity.
Not recommended:
• RAID 0, Concatenated - These are not recommended due to lack of
redundancy and data protection.
Note: While these configurations are not recommended, they can be configured and
utilized.
File Servers
File servers can be archival long term storage repositories or more dynamic user file
storage where files are changed, added and deleted on a daily basis. They can range
from workgroup to company level in their scope. A key factor for file servers is storage
capacity as users add more files. File servers are generally not mission critical systems so
reduced availability and redundancy or none at all is acceptable as the data is usually
backed up and can be restored in a matter of hours.
Archival file server characteristics and recommendations
• Table 2-11 Archival File Server General I/O profile
I/O Profile
(Read/Write)
I/O Profile
(Sequential/Random)
Bandwidth IO Size
Latency
Sensitivity
Growth
Rate
Criticality
90/10 Sequential Moderate >64K High Varies Low
• Table 2-12: Archival File Server RAID Guidelines
RAID Level
Application
Concatenated 0 1 10 5 50
File -
Archival
Recommended Not Recommended Possible
Recommended:
• RAID 10 – Recommended due to the high availability and redundancy and
good performance.
• RAID 5 – Recommended for file 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.
Possible: