Dell PowerVault MD1000 SAS Solution Manual

Dell PowerVault MD1000 SAS Solution Manual Manual pdf 29 page image

A REFERENCE GUIDE FOR OPTIMIZING DELL™ MD1000 SAS SOLUTIONS VER A00PAGE 29 5/06/2005Table 9: Web RAID GuidelinesRAID LevelApplication Concatenated 0 1 10 5 50DatabaseRecommended Not Recommended PossibleRecommended:• RAID 10 – Recommended for enterprise web server solutions where availability andredundancy and performance are the highest priority, usually for stand-alone portal sitesthat are critical to the organization’s business.• RAID 5 – Recommended for web servers that require maximum storage capacity andmoderate data protection and performance.• RAID 50 – Recommended for those solutions that require a balance between storagecapacity and performance.• RAID 0 – Recommended for solutions where the web server will be part of a group of webservers that service a large internet portal and performance is the highest concern. In thissituation, availability and redundancy are addressed by the cluster group and do not needto 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 dataprotectionNote: While this configuration is not recommended, it can be configured and utilized.Database or Online Transaction Processing ServersDatabase servers can range from simple workgroup databases like Microsoft® Access with a fewhundred users to mission-critical enterprise databases like Oracle or SQL Server with thousands ofusers. Database applications will always benefit from some data protection while otherrequirements such as performance and availability will vary. As a general rule, the more critical thedatabase, greater is the need for data protection. Additionally, the performance requirementsincrease relative to the number of users accessing the database.Online Transaction Processing (OLTP) oriented servers are used in a number of industries for theentry 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 availabilityand redundancy possible.Table 10: Database or OLTP General IO profileI/O Profile(Read/Write)I/O Profile(Sequential/Random) Bandwidth I/OSizeLatencySensitivityGrowth Rate Criticality80/20 Random Moderate 8k Moderate Low High