Adaptec 5325301656 Administration Guide - Page 214

RAID 6 Striping with Dual Parity

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Term Definition POSIX (Portable Operating System Interface) protocol public access share quota RAID (Redundant Array of Independent Disks) RAID 0 (Striped) RAID 1 (Mirrored) RAID 5 (Striping with Parity) RAID 6 (Striping with Dual Parity) A set of standard operating system interfaces based on the UNIX operating system. The need for standardization arose because enterprises using computers wanted to develop programs that could run on multiple platforms without the need to recode. Pre-GuardianOS 5.0 Snap Servers use Extended POSIX ACLs. A standardized set of rules that specifies the format, timing, sequencing, and/or error checking for data transmissions. A share that allows all users read/write access to the file system. A limit on the amount of storage space on a volume that a specific user or NIS group can consume. A collection of disk drives that act together as a single storage system. Different RAID types provide different levels of data protection. Distributes data evenly among all disks in the array. This technique, called data striping, results in fast access speeds because it uses multiple physical devices to store the data. However, RAID 0 offers no redundancy and does not accept hot spares. If a single disk drive fails, every file in the RAID is rendered unavailable. Stores data on one disk drive and copies it to another drive in the RAID. A RAID 1 must contain at least two disk drives: one for the data space and one for redundancy. Although the data space in a RAID 1 can never be larger than a single drive, some administrators prefer to add a third drive (either as a hot spare or a member) for additional redundancy. RAID 1 is the most secure method for storing mission-critical data because there is no catastrophic data loss when a disk fails. However, RAID 1 is the most expensive and least efficient storage method. Distributes data evenly among all disks in the array, and maintains parity information (error correction data) that allows the system to recover from a single disk drive failure. RAID 5 provides the best combination of performance, usability, capacity, and data protection. Similar to RAID 5 except that two drives maintain parity information for greater redundancy. System can recover from two drive failures. Provides high reliability and data protection but write performance speed is impacted by the dual parity drives. 200 Snap Server Administrator Guide

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Snap Server Administrator Guide
POSIX (Portable Operating System
Interface)
A set of standard operating system interfaces based on the
UNIX operating system. The need for standardization arose
because enterprises using computers wanted to develop
programs that could run on multiple platforms without the
need to recode. Pre-GuardianOS 5.0 Snap Servers use
Extended POSIX ACLs.
protocol
A standardized set of rules that specifies the format, timing,
sequencing, and/or error checking for data transmissions.
public access share
A share that allows all users read/write access to the file
system.
quota
A limit on the amount of storage space on a volume that a
specific user or NIS group can consume.
RAID (Redundant Array of
Independent Disks)
A collection of disk drives that act together as a single
storage system. Different RAID types provide different levels
of data protection.
RAID 0 (Striped)
Distributes data evenly among all disks in the array. This
technique, called data striping, results in fast access speeds
because it uses multiple physical devices to store the data.
However, RAID 0 offers no redundancy and does not accept
hot spares. If a single disk drive fails, every file in the RAID
is rendered unavailable.
RAID 1 (Mirrored)
Stores data on one disk drive and copies it to another drive
in the RAID. A RAID 1 must contain at least two disk drives:
one for the data space and one for redundancy. Although
the data space in a RAID 1 can never be larger than a single
drive, some administrators prefer to add a third drive (either
as a hot spare or a member) for additional redundancy.
RAID 1 is the most secure method for storing mission-critical
data because there is no catastrophic data loss when a disk
fails. However, RAID 1 is the most expensive and least
efficient storage method.
RAID 5 (Striping with Parity)
Distributes data evenly among all disks in the array, and
maintains parity information (error correction data) that
allows the system to recover from a single disk drive failure.
RAID 5 provides the best combination of performance,
usability, capacity, and data protection.
RAID 6 (Striping with Dual Parity)
Similar to RAID 5 except that two drives maintain parity
information for greater redundancy. System can recover
from two drive failures. Provides high reliability and data
protection but write performance speed is impacted by the
dual parity drives.
Term
Definition