3Ware 720-0104-00 Manual

Also see for 9000 Series: Installation guide User guide Specification Release notes

Contents

3Ware 720-0104-00 Manual Manual pdf 15 page image

Understanding RAID Concepts and Levelswww.3ware.com 11Figure 4. RAID 10 Configuration ExampleRAID 50This array is a combination of RAID 5 with RAID 0. This array type providesfault tolerance and high performance. Requires a minimum of six drives.Several combinations are available with RAID 50. For example, on a 12-portcontroller, you can have a grouping of 3, 4, or 6 drives. A grouping of 3 meansthat the RAID 5 arrays used have 3 disks each; four of these 3-drive RAID 5arrays are striped together to form the 12-drive RAID 50 array.Single DiskA single drive that has been configured as a unit through 3ware software. Likedisks in other RAID configurations, single disks contain 3ware Disk ControlBlock (DCB) information and are seen by the OS as available units.JBODA JBOD is an unconfigured disk attached to your 3ware RAID controller.JBOD configuration is no longer supported in the 3ware 9000 series. 3warerecommends that you use Single Disk as a replacement for JBOD, to takeadvantage of advanced features such as caching. If you are migrating JBODSfrom a 7000/8000 controller, you can enable support for them. For moreinformation, contact Technical SupportHot SpareA single configured drive, available so that a redundant array can be rebuilt incase of drive failure.For additional information about RAID levels, see the article “RAID Primer”on the 3ware website, at: http://www.3ware.com/products/pdf/RAID_Primer.pdf.Determining What RAID Level to UseSelect the RAID configuration to use based on the applications to be used onthe system, whether performance or data protection is of primary importance,and the number of disk drives available for use.