Table of Contents
Advertisement
•
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.
drive subsystem – 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.
drive type – A drive property indicating the characteristics of the drive.
fast initialization – 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.
fault tolerance – The capability of the drive subsystem to undergo a single drive failure per drive
group without compromising data integrity and processing capability. LSI 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.
firmware – 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.
foreign configuration – 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.
formatting – 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.
hole – 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.
host interface – A controller property indicating the type of interface used by the computer host
system: for example, PCIX.
host port count – A controller property indicating the number of host data ports currently in use.
host system – Any computer system on which the controller is installed. Mainframes,
workstations, and stand-alone desktop systems can all be considered host systems.
hot spare – 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.
Page 174
Glossary
DB09-000202-05 37857-02
Rev. F - May 2011
Copyright © 2011 by LSI Corporation. All rights reserved.
Advertisement
Table of Contents
