Artesyn RTM-ATCA-736x-DD Installation and Use (June 2014) - Manual (Page 42)

SAS RAID Details
RTM-ATCA-736X-DD Installation and Use (6806800L82C) 42
3.6.2 BIOS, RAID Create New Array and Global Hot Spare
This menu enables the user to choose the disks that will comprise new RAID volumes or global
hot spares. Using the keyboard arrow keys, highlight the drives in the "RAID DISK" column, and
use the space bar to change to "Yes" or "No", "Yes" if the disk will be a member of the new array
and "No", if otherwise. Alternatively, highlight the drives in the "Hot Spr" (global hot spare)
column, and use the space bar to change to "Yes" or "No", "Yes" if the disk will be a member of
the global hot spare and "No", if otherwise. A maximum of two drives may be designated as a
global hot spare.
Menu Text RAID Level Description
None Default. All discovered disks are presented to the host blade
or CPU, with no RAID function.
IS Volume
(Integrated Stripe) RAID0 Two or more disks are grouped to provide a capacity
aggregation function. The advantage is the multiplicative
performance and capacity effect of four spindles working in
concert to store or retrieve data for the host.
IM Volume
(Integrated Mirror) RAID1 Two disks are grouped to provide a mirror function. By
definition, two drives our bounded such that every write to
one drive is mirrored on the second. If a failure occurs with
either drive, the data is still accessible through the surviving
drive.
IME volume
(Integrated Mirror
Enhanced) RAID1E Three or more disks are grouped to provide a mirror function
using an algorithm extension to permit use with many drives.
If a failure occurs with any drive, data is still accessible through
the surviving drives.