User`s guide

48 007-4522-003
3: Features of the RAID Controller
• Power supply status
• Cooling element status
• Storage system temperature
The LEDs on the ESI/ops panel show the
status of these components.
Configuration on Disk (COD)
Configuration on disk (COD) retains the latest version of the saved configuration at a
reserved location on every physical drive. The RAID Controller in the 2Gb TP9100
(Mylex FFx-2) uses COD version 2.1. Previous versions of the TP9100 use COD version
1.0.
Controller firmware versions prior to 7.0 use COD 1.0 format. Firmware versions 7.0 and
later use COD 2.1 format. FFX-2 RAID controller support started on version 8.0 firmware.
The COD information stored on each drive is composed of the following:
• Device definition, which contains the following information.
– The logical device definition/structure for those logical devices dependent on
this physical device. This information should be the same for all physical
devices associated with the defined logical device.
– Any physical device information pertaining to this physical device that is
different for different physical devices even though they may be part of the
same logical device definition.
– Data backup for data migration. This area also includes required information
for the Background initialization feature.
• User device name information and host software configuration parameters. This
information is defined by the user and should be the same on all physical drives
that are associated with the defined logical drive.
• COD 2.1 locking mechanism. This feature is designed to provide a locking
mechanism for multiple controller systems. If any of the controllers is allowed to
update COD information independently of the other controllers, this feature allows
the controller to lock the COD information for write access before updating the that
drive. This feature prevents multiple controllers from updating the COD at the
same time.