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Glossary
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• Failed: A physical disk that was originally configured
as Online or Hot Spare, but on which the firmware
detects an unrecoverable error.
• Un-configured Bad: A physical disk on which the
firmware detects an unrecoverable error; the
physical disk was Un-configured Good or the
physical disk could not be initialized.
• Missing: A physical disk that was Online, but which
has been removed from its location.
• Offline: A physical disk that is part of a virtual disk
but which has invalid data as far as the RAID
configuration is concerned.
• None: A physical disk with the unsupported flag set.
An Un-configured Good or Offline physical disk
that has completed the prepare for removal
operation.
Protocol
A set of formal rules describing how to transmit data,
generally across a network or when communicating
with storage subsystems. Low-level protocols define
the electrical and physical standards to be observed,
bit- and byte-ordering, and the transmission and error
detection and correction of the bit stream. High-level
protocols deal with the data formatting, including the
message syntax, the terminal to system dialogue,
character sets, sequencing of messages, etc.
R
RAID
Acronym for Redundant Array of Independent Disks
(originally Redundant Array of Inexpensive Disks). It
is an array of multiple independent physical disks
managed together to yield higher reliability and/or
performance exceeding that of a single physical disk.
The virtual disk appears to the operating system as a
single storage unit. I/O is expedited because several
disks can be accessed simultaneously. Redundant
RAID levels (RAID levels 1, 5, 10, and 50), provide
data protection.
RAID Level Migration
RAID level migration (RLM) changes the array from
one RAID level to another. It is used to move between
optimal RAID levels. You can perform a RLM while
the system continues to run, without having to
reboot. This avoids downtime and keeps data
available to users.
RAID Levels
A set of techniques applied to disk groups to deliver
higher data availability, and/or performance
characteristics to host environments. Each virtual disk
must have a RAID level assigned to it.
RAID Management Utility
A RAID management utility is used to configure
physical disks into disk groups and virtual disks. The
BIOS Configuration Utility is also known as Ctrl-R.
Use the BIOS Configuration Utility if no operating
system has been installed yet on the controller. The
BIOS Configuration Utility is built on elements
called
controls
. Each control performs a function. The
functions include procedures you can use to configure
physical disks and virtual disks.
The Dell OpenManage™ Storage Management
configures the disks after you have installed the
operating system. Storage Management enables you
to perform controller and enclosure functions for all
supported RAID and non-RAID controllers and
enclosures from a single graphical or command-line
interface without requiring the use of the controller
BIOS utilities.
SAS RAID Storage Manager configures, monitors,
and maintains the PERC 5 controllers, battery backup
units, and other devices running on a server.
Dell_PERC5_UG.book Page 105 Tuesday, February 13, 2007 6:02 PM