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Hardware Maintenance Manual: Netfinity 7600 – Type 8665 Models 1RY, 2RY
The array specifies which drives to include in the striping of data. Each array
is subdivided into one or more logical drives. The logical drives specify the
following:
•
The number and size of the physical drives as seen by the operating
system. The operating system sees each defined logical drive as a
physical drive.
•
The RAID level. When a logical drive is defined, its ServeRAID level (0, 1,
or 5) is also defined.
low-level format
The writing of track and sector control information on the disk so that a
computer system can store data in and subsequently retrieve data from the
disk.
mapping
The establishing of correspondences between a given logical structure and a
given physical structure.
MB
Megabyte; equal to approximately 1 000 000 bytes.
menu-driven
Concerning application software allowing user to select operations from one
or more menus without entering keyboard commands.
mirroring
The process of writing the same data to two disk units within the same
auxiliary storage pool (disk array) at the same time. The two disk units
become a mirrored pair, allowing the system to continue when one of the
mirrored units fails.
non-volatile random access memory (NVRAM)
Random access memory that retains its contents after electrical power is shut
off.
NVRAM
Non-volatile random access memory.
OFL
Offline, a good drive that replaces a defunct drive in a RAID level-1 or level-5
array. This drive is associated with the array but does not contain any data.
Drive status remains OFL during the rebuild phase.
OKY
Good functional state. The ServeRAID adapter's logical drive state in which
all drives in the array are online and fully operational.
ONL
Online, a drive that ServeRAID adapter detects as installed, operational, and
configured into an array appear as this state.
overlap
To perform an operation at the same time another operation is being
performed; for example, to perform input/output operations while
instructions are being executed by the processing unit.
parity
The state of being odd or even used as the basis of a method of detecting
errors in binary-coded data.
parity bit
A binary digit appended to a group of binary digits to make the sum of all the
digits, including the appended binary digit, either odd or even as pre-
established.
PFA
The firmware of a hard drive uses algorithms to track the error rates on the
drive. The drive alerts the user with a Predictive Failure Analysis (PFA) alert
via the and Netfinity Director when degradation of drive performance
(read/write errors) is detected. When a PFA alert occurs, physical
replacement of the drive is recommended.
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