RAID Controllers
In the event of a RAID Controller failure, replace the Controller using the following procedure:
CAUTION
: DO NOT REMOVE THE FAILED RAID CONTROLLER until the new RAID Controller
has arrived and is ready to be installed. Removing a RAID Controller reduces air flow and cooling
and can result in the system overheating.
CAUTION
: Single Controller replacement in a dual-Controller system should always be carried out
as a hot-swap operation. This ensures that firmware versions match and allows Controller settings to
be automatically applied to the new Controller.
CAUTION
: Computer components and disk drives are sensitive to electrostatic discharge (ESD).
Always ground any electrostatic charge from your person before touching components with your
hands or with any tools. Always use an anti-static wrist strap (one ships with each unit) while
installing or performing maintenance on any Nexsan RAID storage unit. See
Take proper
ESD precautions
on page 14 for detailed instructions.
Note
If you are running in
Dual-Controller Non-Redundant
mode (see
System Mode
in the
Nexsan High-
Density Storage User Guide
) or if you have hosts that do not have multipathing configured but have paths
available to each Controller, shut down or disconnect all hosts prior to beginning this procedure.
►
To replace a RAID Controller:
1. Determine which RAID Controller has failed by examining the
STAT
LED on each module (see
Rear
panel,
on page 1). A flashing red LED indicates the failed unit. The
Home
page of the graphical user
interface (GUI) also tells you which unit has failed (see the
Nexsan High-Density Storage User Guide
).
Note
In some cases, a RAID Controller needs to be replaced even if it has not failed outright. In this
case, you must determine which RAID Controller to replace by following the troubleshooting procedures
in
Chapter 4
of the
Nexsan High-Density Storage User Guide
.
Note
If you are replacing a single
failed
Controller in a dual-controller system, skip to step 3.
2. If necessary, do one of the following:
If you have a dual-Controller unit and you need to replace a controller
that has not yet failed
, navigate
to
System Admin > Reboot
in the graphical user interface (GUI). Under
Controller Maintenance
,
select the Controller that you need to replace, select the confirmation check box, and click
Execute
NOW
.
If you have a single-Controller unit or if you must replace both Controllers in a dual-Controller unit,
navigate to
System Admin > Reboot
in the graphical user interface (GUI), select
System
Shutdown
, select the confirmation check box, and click
Execute NOW
.
3. Carefully note communication cable locations, then remove all cables from the failed RAID Controller.
Note
Cables should only be reconnected to the same ports from which they were removed in order to
ensure proper communication between the unit and connected hosts.
RAID Controllers
23
Part Number: P0450139
Rev: A
www.nexsan.com
Nexsan E60™/Nexsan E48™
FRU Removal and Replacement Guide
3