Installation guide

Functional Description
Manual No. 771971 2-9
Configuration on Disk
Figure 2-3. Configuration on Disk Examples
Firmware 4.x provides Configuration on Disk (COD), which allows a RAID
equipped computer to detect certain hardware changes on power-up or reset
and automatically reconfigure accordingly.
Mylex Format
The necessary configuration information is stored in NVRAM on the
controller as well as on the last 128 sectors on every hard disk that is
currently part of the controller’s configuration. This format with
configuration information stored in the last 128 sectors of a disk is a unique
Mylex format.
Determining the Configuration to be Used
On start-up, the configuration information is read from NVRAM on the
controller. This information is used to detect all physically connected and
responding drives during a drive scan. The disk configuration header read
from each drive is compared with the reference configuration header in
NVRAM.