Lenovo ThinkServer RD330 MegaRAID SAS Software User Guide - Page 393

MegaRAID SAS Software User Guide Appendix C: Glossary | drive subsystem drive type EKM fast initialization fault tolerance firmware foreign configuration formatting hole host interface host port count host system hot spare  Unconfigured Bad: A drive on which the firmware detects an unrecoverable error; the drive was Unconfigured Good or the drive could not be initialized.  Missing: A drive that was Online, but which has been removed from its location.  Offline: A drive that is part of a virtual drive but which has invalid data as far as the RAID configuration is concerned.  None: A drive with an unsupported flag set. An Unconfigured Good or Offline drive that has completed the prepare for removal operation. A collection of drives and the hardware that controls them and connects them to one or more controllers. The hardware can include an intelligent controller, or the drives can attach directly to a system I/O bus controller. A drive property indicating the characteristics of the drive. External Key Management A mode of initialization that quickly writes zeroes to the first and last sectors of the virtual drive. This allows you to immediately start writing data to the virtual drive while the initialization is running in the background. The capability of the drive subsystem to undergo a single drive failure per drive group without compromising data integrity and processing capability. SAS RAID controllers provides fault tolerance through redundant drive groups in RAID levels 1, 5, 6, 10, 50, and 60. They also support hot spare drives and the auto-rebuild feature. Software stored in read-only memory (ROM) or programmable ROM (PROM). Firmware is often responsible for the behavior of a system when it is first turned on. A typical example would be a monitor program in a system that loads the full operating system from drive or from a network and then passes control to the operating system. A RAID configuration that already exists on a replacement set of drives that you install in a computer system. MegaRAID Storage Manager software allows you to import the existing configuration to the RAID controller, or you can clear the configuration so you can create a new one. The process of writing a specific value to all data fields on a drive, to map out unreadable or bad sectors. Because most drives are formatted when manufactured, formatting is usually done only if a drive generates many media errors. In MegaRAID Storage Manager, a hole is a block of empty space in a drive group that can be used to define a virtual drive. A controller property indicating the type of interface used by the computer host system: for example, PCIX. A controller property indicating the number of host data ports currently in use. Any computer system on which the controller is installed. Mainframes, workstations, and standalone desktop systems can all be considered host systems. A standby drive that can automatically replace a failed drive in a virtual drive and prevent data from being lost. A hot spare can be dedicated to a single redundant drive group or it can be part of the global hot spare pool for all drive groups controlled by the controller. When a drive fails, MegaRAID Storage Manager software automatically uses a hot spare to replace it and then rebuilds the data from the failed drive to the hot spare. Hot spares can be used in RAID 1, 5, 6, 10, 50, and 60 storage configurations. Page 393