Dell PowerVault MD1000 SAS Solution Manual

Dell PowerVault MD1000 SAS Solution Manual Manual pdf 27 page image

A REFERENCE GUIDE FOR OPTIMIZING DELL™ MD1000 SAS SOLUTIONS VER A00PAGE 27 5/06/2005RAID 10RAID 10 has good I/O performance, excellent availability and redundancy. The biggest drawbackof RAID 10 is that it requires twice the number of physical disks needed for data. This RAIDconfiguration should be used in situations requiring maximum availability, redundancy, andperformance.RAID 5RAID 5 has good I/O performance, data protection and requires only one additional physical diskthan the number needed for data. RAID 5 should be used in situations where maximum storagecapacity is required along with a moderate amount of data protection.RAID 50A balance between RAID 5 and RAID 10, this solution offers good I/O performance, availability andgood storage capacity. This configuration offers slightly higher performance than RAID 5, butrequires multiple additional physical disks than the number needed for data. It does howeverprovide greater storage capacity than a RAID 10 solution with a decrease in performance and dataprotection. This should be used in situations where greater redundancy and data protection isrequired as well as a reasonable storage capacity.ConcatenatedThis solution is not recommended due to lack of data protection and redundancy and noperformance gain.Note: For more details on RAID configurations see the Dell ‘Getting Started with RAID’ document(http://support.dell.com/support/edocs/storage/RAID/RAIDbk0.pdf)Application specific guidelinesE-Mail ServersThe storage requirements for e-mail servers can vary depending on the size, the amount, and thetype of users. While small departmental e-mail servers may work well with a small amount ofstorage and limited features; large corporate e-mail servers normally require greater storagecapacity, very high availability, performance, and scalability. I/O profiles will vary depending on thenumber of users and type of mail and attachments sent.Table 6: Email Server General I/O profileI/O Profile(Read/Write)I/O Profile(Sequential/Random) Bandwidth I/OSizeLatencySensitivityGrowthRate Criticality60/40 Random Heavy 4k High High High