Dell PowerVault 221S Optimizing Dell SCSI Solutions - Page 8

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • 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 I/O Profile (Read/Write) (Sequential/Random) Bandwidth 95/5 Random Moderate IO Size < 64K Latency Sensitivity Moderate Growth Rate Low Criticality High • Table 2-8: Web RAID Guidelines Application Database Concatenated 0 Recommended RAID Level 1 10 Not Recommended 5 50 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. PAGE 8 11/17/2005