Dell EMC ME4 Series Owner's Manual page 26

• In each diagram, the IOM is oriented for insertion into the top IOM slot (A) of 2U enclosures. When oriented for use in the bottom IOM
slot (B) of 2U enclosures, the IOM labels appear upside down.
• In each diagram, the IOM is oriented for insertion into either IOM slot of 5U84 enclosures.
• Alternatively, you can configure the 2U controller enclosure with a single-IOM. Install the controller module in IOM slot A, and fit the
IOM-blank to IOM slot B.
Figure 31. LEDs: ME4 Series Storage System FC/iSCSI controller modules (FC and 10GbE SFPs)
Table 6. LEDs: ME4 Series controller modules (FC and iSCSI SFPs)
LED Description
1
Host 4/8/16 Gb FC
Link Status
Link Activity
2,3
Host 10 GbE iSCSI
2
Link Status
Link Activity
3 OK
4 Fault
5 OK to remove
6 Identify
4
7 Cache status
26 Storage system hardware
1
Definition
Off—No link detected.
Green—The port is connected and the link is up.
Blinking green—The link has I/O activity.
Off —No link detected.
Green—The port is connected and the link is up.
Blinking green—The link has I/O or replication activity.
Green—The controller is operating normally.
Blinking green—System is booting.
Off—The controller module is not OK, or is powered off.
Off —The controller is operating normally.
Amber—A fault has been detected or a service action is required.
Blinking amber—Hardware-controlled power-up or a cache flush or restore
error.
Off—The controller is not prepared for removal.
Blue—The controller module is prepared for removal.
White—The controller module is being identified.
Green—Cache is dirty (contains unwritten data) and operation is normal.
The unwritten information can be log or debug data that remains in the
cache, so a green cache status LED does not, by itself, indicate that any
user data is at risk or that any action is necessary.
Off—In a working controller, cache is clean (contains no unwritten data).
This is an occasional condition that occurs while the system is booting.