Dell PowerVault MD3000i Hardware Owner's Manual - Page 32
RAID 5, RAID Level Usage, RAID 0 is best used for video editing, image editing, prepress applications
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RAID 5 RAID 5 uses parity and striping data across all physical disks (distributed parity) to provide high data throughput and data redundancy, especially for small random access. RAID 5 is the most versatile RAID level and is suited for multi-user environments where typical I/O size is small and there is a high proportion of read activity. RAID 10 RAID 10, a combination of RAID 1 and RAID 0, uses disk striping across mirrored disks. It provides high data throughput and complete data redundancy. Utilizing an even number of physical disks (four or more) creates a RAID level 10 disk group and/or virtual disk. Because RAID levels 1 and 10 use disk mirroring, half of the capacity of the physical disks is utilized for mirroring. This leaves the remaining half of the physical disk capacity for actual storage. RAID 10 is automatically used when a RAID level of 1 is chosen with four or more physical disks. RAID Level Usage To ensure best performance, you should select an optimal RAID level when you create a system physical disk. The optimal RAID level for your disk array depends on a number of factors, including: • Number of physical disks in the disk array • Capacity of the physical disks in the disk array • Need for redundant access to the data (fault tolerance) • Disk performance requirements RAID 0 is best used for video editing, image editing, prepress applications, or any application requiring high bandwidth. RAID 1 offers fast performance and the best data availability, but also the highest disk overhead. It is best used for accounting, payroll, or financial applications. RAID 5 is best used for file, application, database, web, e-mail, news, and intranet servers. RAID 10 works well for medium-sized databases or any environment that requires high performance and fault tolerance and moderate-to-medium capacity. 32 Using Your RAID Enclosure