LSI 1600 Manual De Usuario

        MegaRAID Enterprise 1600 Hardware Guide

RAID (Redundant Array of Independent Disks) is a collection of specifications that describe a
system for ensuring the reliability and stability of data stored on large disk subsystems. A RAID
system can be implemented in a number of different versions (or RAID Levels). The standard
RAID levels are 0, 1, 3, and 5. MegaRAID supports all standard RAID levels and RAID levels 10,
30, and 50, special RAID versions supported by MegaRAID.

In RAID, check consistency verifies the correctness of redundant data in an array. For example, in
a system with dedicated parity, checking consistency means computing the parity of the data drives
and comparing the results to the contents of the dedicated parity drive.

Fault tolerance is achieved through cooling fans, power supplies, and the ability to hot swap drives.
MegaRAID provides hot swapping through the hot spare feature. A hot spare drive is an unused
online available drive. MegaRAID can instantly rebuild a logical drive using a hot spare.

After the hot spare is automatically moved into the RAID subsystem, the failed drive can be
automatically rebuilt. The RAID disk array continues to handle requests while the rebuild occurs.