Chapter 6: LEDDescriptions
LEDs for 12-, 24-, 48-Drive Systems
QX and QXS Setup Guide 172
LEDNo./Description Color State Definition
7 — Fault/Service
Required
Amber On
Blink
A fault is detected or a service action is required.
Hardware-controlled power-up, or a cache flush or restore error.
8 — Cache Status Green On
Off
Blink
Cache is dirty (contains unwritten data) and operation is normal.
Cache is clean (contains no unwritten data).
CompactFlash flush or cache self-refresh is in progress,
indicating cache activity.
(See QX/QXS Cache Status LED details on page 157)
9 — Expansion Port
Status
Green On
Off
Port is connected and the link is up.
Port is empty or link is down.
1The 8 Gbit SFP modules do not support 1 Gbit link speeds.
Once a Link Status LED is lit, it remains so, even if the controller is shut down via the Disk Storage
Management Utility or CLI.
When a controller is shut down or otherwise rendered inactive, its Link Status LED remains illuminated,
falsely indicating that the controller can communicate with the host. Though a link exists between the host
and the chip on the controller, the controller is not communicating with the chip. To reset the LED, the
controller must be power-cycled (see Power On/Power Off on page 85).
Power Supply LEDs for 12-, 24-, 48-Drive Systems
Power redundancy is achieved through two independent load-sharing power supplies. In the event of a
power supply failure, or the failure of the power source, the storage system can operate continuously on a
single power supply. Greater redundancy can be achieved by connecting the power supplies to separate
circuits. DC power supplies are equipped with a power switch. AC power supplies may or may not have a
power switch (the newer model in Figure 122 on the next page has no power switch). Whether a power
supply has a power switch is significant to powering on/off.
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