Dell PowerVault 221S Optimizing Dell SCSI Solutions - Page 9

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • 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 I/O Profile (Read/Write) (Sequential/Random) Bandwidth 80/20 Random Moderate IO Size 2k-8k Latency Sensitivity Moderate Growth Rate Low Criticality High • Table 2-10: OLTP RAID Guidelines Application OLTP Concatenated 0 Recommended RAID Level 1 10 Not Recommended 5 50 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. PAGE 9 11/17/2005