Lenovo ThinkServer RD240 Software User's Manual page 352

drive
subsystem
drive type
fast
initialization
fault tolerance
firmware
B-4
•
Unconfigured Good: A drive accessible to the RAID controller but not
configured as a part of a virtual drive or as a hot spare.
•
Hot Spare: A drive that is configured as a hot spare.
•
Online: A drive that can be accessed by the RAID controller and will
be part of the virtual drive.
•
Rebuild: A drive to which data is being written to restore full
redundancy for a virtual drive.
•
Failed: A drive that was originally configured as Online or Hot Spare,
but on which the firmware detects an unrecoverable error.
•
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.
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. ThinkServer 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
Glossary