Dell PowerVault 220S Manual

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Dell PowerVault 220S Manual Manual pdf 10 page image

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02PAGE 10 11/17/2005• RAID 50 – Recommended for those solutions that require a balance betweenstorage capacity and performance.Possible:• RAID 1 – Possible solution for situations which do not require high storagecapacity.Not recommended:• RAID 0, Concatenated - These are not recommended due to lack ofredundancy and data protection.Note: While these configurations are not recommended, they can be configured andutilized.File ServersFile servers can be archival long term storage repositories or more dynamic user filestorage where files are changed, added and deleted on a daily basis. They can rangefrom workgroup to company level in their scope. A key factor for file servers is storagecapacity as users add more files. File servers are generally not mission critical systems soreduced availability and redundancy or none at all is acceptable as the data is usuallybacked 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 profileI/O Profile(Read/Write)I/O Profile(Sequential/Random) Bandwidth IO Size LatencySensitivityGrowthRate Criticality90/10 Sequential Moderate >64K High Varies Low• Table 2-12: Archival File Server RAID GuidelinesRAID LevelApplication Concatenated 0 1 10 5 50File -ArchivalRecommended Not Recommended PossibleRecommended:• RAID 10 – Recommended due to the high availability and redundancy andgood performance.• RAID 5 – Recommended for file servers that require maximum storagecapacity and only base data protection and performance.• RAID 50 – Recommended for those solutions that require a balance betweenstorage capacity and performance.Possible: