3Ware 9550SXU-16ML User Guide - Page 136
Drives to be included in the unit, Type of configuration, Name of the unit (optional)
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Chapter 8. Configuring Units Unit policies that affect how the unit will be handled You can make some types of changes to the RAID configuration later, and you can change the unit name and the unit policies. For details, see "Changing An Existing Configuration" on page 144. Note: If you will install the operating system on and boot from a unit managed through the new 3ware RAID controller, Chapter 3, "First-Time RAID Configuration Using 3BM," provides step-bystep instructions. Drives to be included in the unit You may include from one to sixteen drives in the unit, depending on the number of drives available and the model of the controller you have. (For information about how many drives to select for a given RAID level, see Table 2, "Possible Configurations Based on # of Drives," on page 9.) You may only select available drives that are not currently part of a unit. If you want to use drives that are currently part of a different unit, you must delete that unit, first, to make the drives available. (For details, see "Deleting a Unit" on page 150.) If drives are listed under "Incomplete Drives and Others," they must be deleted before they can be used. If you want to add drives to be used in the unit, see "Adding a Drive through 3DM" on page 160. Type of configuration Available configuration types include RAID 0, RAID 1, RAID 5, RAID 10, RAID 50, and Single Disk. For information about the different RAID levels, see "Understanding RAID Concepts and Levels" on page 4. Note: Creating a unit erases all data on all drives. Although creating a RA1D 1 (mirror) creates a unit that will have a duplicate of data on both drives after it is put in use, creating a RAID 1 cannot be used to make a backup copy of data that currently exists on a single drive unless you migrate from a RAID 1 to two individual single disks. Name of the unit (optional) Units can be given names. These names will be visible in 3DM and CLI. 126 3ware 9550SX Serial ATA RAID Controller User Guide