HP Xw8200 Adaptec SCSI RAID 2120S: Software User's Guide - Page 28

BBS Support, Array, based BBS Support, Automatic rebuild on replacement

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Page 28 highlights

Adaptec SCSI RAID 2120S/2200S Software User's Guide If Runtime BIOS is enabled and the BBS Support and Arraybased BBS Support options are disabled, the controller BIOS is enabled and will post the lowest numbered array (typically 00) on the first controller found as a legacy Int13h bootable hard disk drive. The default is Enabled. ■ Automatic rebuild on replacement - If enabled, this option lets you replace a failed drive in the same enclosure slot in a RAID 1, RAID 5, RAID 10 or RAID 50. Then the BIOS recognizes that the failed drive has been replaced, initializes the new disk, and immediately initiates a failover. Note that this option is supported only for disks in SAF-TE enclosures or backplanes. The default is Enabled. ■ Array Background Consistency Check - If enabled, this option forces the controller to constantly check all portions of disks used by all arrays to see if the disks can return data from the blocks. On a fully-redundant RAID 5 with no bad segments, the controller repairs any data that cannot be read. The default is Disabled. ■ BBS Support - If the Runtime BIOS option and this option are enabled and the Array-based BBS Support option is disabled, the lowest numbered array on each controller is posted as a BBS (BIOS Boot Specification) device. The default is Enabled. ■ Array-based BBS Support - If Runtime BIOS, BBS Support and this option are all enabled, the lowest numbered three devices (typically 00, 01 and 02) on each controller in the system are posted as BBS devices. In a BBS-enabled system with two controllers installed, and at least three arrays on each controller, if Array based BBS support is enabled the "Hard drive boot order menu" will include six entries for arrays connected to the two RAID controllers. 2-12

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2-12
Adaptec SCSI RAID 2120S/2200S Software User’s Guide
If Runtime BIOS is enabled and the
BBS Support
and
Array-
based BBS Support
options are disabled, the controller
BIOS is enabled and will post the lowest numbered array
(typically 00) on the first controller found as a legacy Int13h
bootable hard disk drive.
The default is
Enabled
.
■
Automatic rebuild on replacement
— If enabled, this option
lets you replace a failed drive in the same enclosure slot in a
RAID 1, RAID 5, RAID 10 or RAID 50. Then the BIOS
recognizes that the failed drive has been replaced, initializes
the new disk, and immediately initiates a failover. Note that
this option is supported only for disks in SAF-TE enclosures
or backplanes.
The default is
Enabled
.
■
Array Background Consistency Check
— If enabled, this
option forces the controller to constantly check all portions
of disks used by all arrays to see if the disks can return data
from the blocks. On a fully-redundant RAID 5 with no bad
segments, the controller repairs any data that cannot be
read.
The default is
Disabled
.
■
BBS Support
— If the
Runtime BIOS
option and this option
are enabled and the
Array-based BBS Support
option is
disabled, the lowest numbered array on each controller is
posted as a BBS (BIOS Boot Specification) device.
The default is
Enabled
.
■
Array-based BBS Support
— If
Runtime BIOS
,
BBS
Support
and this option are all enabled, the lowest
numbered three devices (typically 00, 01 and 02) on each
controller in the system are posted as BBS devices.
In a BBS-enabled system with two controllers installed, and
at least three arrays on each controller, if Array based BBS
support is enabled the “Hard drive boot order menu” will
include six entries for arrays connected to the two RAID
controllers.