Dell PowerVault 220S Manual

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Dell PowerVault 220S Manual Manual pdf 9 page image

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02PAGE 9 11/17/2005• RAID 5 – Recommended for web servers that require maximum storage capacityand only base data protection and performance.• RAID 50 – Recommended for those solutions that require a balance betweenstorage capacity and performance.• RAID 0 – Recommended for solutions where web server will be part of a group ofweb servers that service a large internet portal and performance is the highestconcern. In this situation, availability and redundancy is handled by the clustergroup and does not need to happen at the disk level.• RAID 1 – Good solution for small websites which do not require high storagecapacity.Not recommended:• Concatenated - This solution is not recommended due to lack of redundancy anddata protectionNote: While this configuration is not recommended, it can be configured and utilized.Online Transaction Processing ServersOnline Transaction Processing (OLTP) oriented servers are used in a number ofindustries for the entry and retrieval of transactions for example, OLTP is common inbanking, airlines, mail-order, and supermarkets. They are generally mission criticalservers that require the maximum availability and redundancy possible.• Table 2-9: OLTP General IO profileI/O Profile(Read/Write)I/O Profile(Sequential/Random) Bandwidth IO Size LatencySensitivityGrowthRate Criticality80/20 Random Moderate 2k-8k Moderate Low High• Table 2-10: OLTP RAID GuidelinesRAID LevelApplication Concatenated 0 1 10 5 50OLTPRecommended Not Recommended PossibleRecommended:• RAID 10 – Since OLTP systems are very critical for most business, this RAIDconfiguration is highly recommended due to the high availability andredundancy and good performance.• RAID 5 – Recommended for OLTP servers that require maximum storagecapacity and only base data protection and performance.