Dell PowerVault MD3000i User's Guide - Page 58
Hot Spare Drive Protection, Automatically Configuring Hot Spares
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If you plan to create multiple virtual disks, wait until you have created all the virtual disks to register them. Waiting prevents you from having to register virtual disks more than once. Linux NOTE: You need super-user (Linux) privileges to run the hot_add utility. The hot_add utility is installed with the host-agent package and is run from the Linux command line. You cannot run the hot_add utility using the MD Storage Manager. Windows Windows automatically registers virtual disks. NOTE: Virtual disks mapped to Windows Server 2008 hosts are marked offline by default. To bring the virtual disks online, use the Disk Management MMC (if you are using a GUI version of Windows Server 2008) or use the DiskPart utility (if you are using a Core version of Windows Server 2008). Hot Spare Drive Protection Hot spare drives in a storage array provide an additional level of protection in case a physical disk fails. Hot spare drives only take over for failed drives in a RAID level 1, 5, or 10 disk group. Using a hot spare drive can be an advantage because it automatically replaces a failed physical disk that is part of a disk group. You can see whether hot spare protection is currently set by viewing the Hot Spare Physical Disks line in the Hardware Components area of the Summary tab. You can also see the number of standby and in-use hot spares. A standby hot spare drive is a physical disk that has been assigned as a hot spare drive and is available to take over for any failed physical disk. An in-use hot spare drive is a physical disk that has been assigned as a hot spare drive and is currently taking over for a failed physical disk. Automatically Configuring Hot Spares You can choose to allow MD Storage Manager to automatically configure hot spare drives. With automatic configuration, the controller automatically configures the number and type of hot spare drives that will provide optimal 58 Disk Groups and Virtual Disks