84 IBM Midrange System Storage Hardware Guide
Power supply and fan unit LEDs
Each power supply fan (Figure 3-61) contains one power supply and two fans.
Figure 3-61 Power supply and fan unit LEDs
The LEDs are:
Power supply fan LED (AC power) (green)
– Off: Power supply fan is not providing AC power.
– On: Power supply fan is providing AC power.
Serviced action allowed (blue) (see “Enclosure ID” on page 82 for details)
– On: Safe to remove.
– Off: Normal status.
Needs attention (amber)
– Off: Normal status.
– On: Power supply fan requires attention.
Power supply fan Direct Current Enabled (DC power) (green)
– Off: Power supply fan is not providing DC power.
– On: Power supply fan is providing DC power.
3.5.6 DS5020 storage subsystem host-side connections
The DS5020 integrates the host-side and drive-side connections into the controller itself. The
DS5020 has two 8 Gbps host connections by default. They are mounted on the mainboard of
the controller. Another two host ports per controller can be added when ordering the DS5020.
They can be installed only by factory. No MES field upgrade will be possible. Currently, you
can order 1 Gbps iSCSI or 8 Gbps FC Host ports. Refer to “Controller” on page 71 for the
configuration options. The FC Host connections support Fibre Channel attachment through
SAN switches or direct connections. The iSCSI Host connections support 100 Mbps or
1 Gbps switched Ethernet or iSCSI network and direct connection.
8 Gbps FC host ports
These ports autonegotiate with 2 Gbps, 4 Gbps, and 8 Gbps Fibre Channel speed if an
8 Gbps SFP is installed. 1 Gbps FC speed will not be supported.
4 Gbps FC drive ports
The controller has two drive ports that belong to the same drive channel. Both ports must
run at 4 Gbps speed because only EXPs and drives running a 4 Gbps are supported to be
attached to the DS5020.
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