HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 63
Managing Storage, Creating Virtual Disks and Volumes,
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CHAPTER 3 Managing Storage This chapter describes how to use SMU to configure and manage virtual disks, spare disks, volumes, volume-to-host mappings, and to use volume snapshot features. It contains the following sections: ■ "Creating Virtual Disks and Volumes" on page 63 ■ "Managing Virtual Disks" on page 71 ■ "Managing Spares" on page 80 ■ "Managing Volumes" on page 84 ■ "Managing Host Access to Volumes" on page 94 ■ "Using Snapshot Services" on page 104 ■ "Using Volume-Copy Services" on page 121 ■ "Using the Scheduler" on page 127 Creating Virtual Disks and Volumes You can create a virtual disk when you have enough available disk drives of the same type for the RAID level you want to use. A maximum of 16 virtual disks per controller can exist. The controller safeguards against improperly combining SAS and SATA disk drives in a virtual disk. The system displays an error message if you choose drives that are not of the same type. Each virtual disk is owned by only one of the controllers. For most purposes, it does not matter which controller owns a virtual disk because SMU automatically selects the owner and balances the number of virtual disks each controller owns. Alternatively, you can select the owner yourself. In a dual-controller system, when a controller fails, the partner controller assumes temporary ownership of the failed controller's virtual disks and resources. If the system uses a fault-tolerant cabling configuration, both controllers' LUNs will be accessible through the partner. 63