HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 64
Appendix B., Number of Disk Drives Supported for Each RAID Level
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The following table specifies the minimum and maximum numbers of disk drives supported for each RAID level. For more information about RAID levels, see Appendix B. Table 3-1 Number of Disk Drives Supported for Each RAID Level Min. Max. RAID Level Drives Drives Note Non-RAID 1 1 0 2 16 1 2 2 To create a mirror with more than two drives, use RAID 10. 3 3 16 5 3 16 6 4 16 10 4 16 RAID 10 must have the same, even number of drives in each sub-vdisk. Each sub-vdisk can have 2-8 drives. The total number of drives is a multiple of the number of drives in each sub-vdisk. 50 6 32 RAID 50 must have the same number of drives in each sub-vdisk. Each sub-vdisk can have 3-16 drives. The total number of drives is a multiple of the number of drives in each sub-vdisk. When you create a virtual disk you can also create volumes within it. A volume is a logical subdivision of a virtual disk, and can be mapped to host ports for access by data hosts. The storage system only presents volumes, not virtual disks, to data hosts. You can create a virtual disk that has one volume or multiple volumes. Singlevolume virtual disks work well in environments that need one large, fault-tolerant storage space for data on one server. A large database accessed by users on a single server that is used only for that application is an example. Multiple-volume virtual disks work well when you have very large disk drives and you want to make the most efficient use of disk space for fault tolerance (parity and spares). However, I/O to multiple volumes in the same virtual disk can slow system performance. 64 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008