LEDs on the IOMs
In a duplex array, all DE120S and DE240S drive shelves have two I/O modules (IOMs).
• Each IOM has an Attention LED and a Locate LED.
• Each IOM has four SAS ports, each with a Port Link LED and a Port Attention LED.
The following illustration shows the IOM LEDs.
Figure 20. IOM LEDs
LED Status
Description
1 SAS Port Attention
Amber
One or more of the links in the port
are not working properly.
Off
The port is optimal and no link error
has occurred.
2 SAS Port Link Green The SAS port established a link (with
either a controller or another drive
shelf).
Off No link is established to another SAS
port.
3 IOM Attention
Amber
The IOM is not functioning correctly.
Off The IOM is functioning correctly.
4 Locate Blue There is an active request to
physically locate the drive shelf.
Note: When this LED is activated,
the Locate LED on the left end cap of
the drive shelf is also activated.
Locate LEDs turn off automatically
after 30 minutes.
Off
There is no active request to locate
the drive shelf.
180 ThinkSystem DE Series Hardware Installation and Maintenance Guide for 2U Enclosures
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