Item Name Icon Description
• Off – No power
• On steady blue – Power is on and firmware is running
• Blinking blue – Storage system is busy booting or updating
• On steady amber – Hardware detected fault
• Blinking amber – Software detected fault
3 Identification button Lights when the storage system identification is enabled.
• Off – Normal status
• Blinking blue – Storage system identification enabled
4 Unit ID display — Displays the storage system identification number. The default value for a new
storage system is 01.
5 Hard drives — Can have up to 24 2.5-inch SAS hard drives.
SC4020 Storage System Back-Panel Features and
Indicators
The back panel of the SC4020 contains the storage controller indicators and power supply indicators.
Figure 5. SC4020 Storage System Back-Panel View
Item
Name Icon Description
1 Power supply/cooling fan
module (PSU) (2)
— Contains a 580 W power supply and fans that provide cooling for the storage
system.
2 Battery backup unit
(BBU) (2)
— Allows the storage controller to shut down smoothly when a loss of AC power is
detected.
3 Storage controller
(2)
— Each storage controller contains:
• Back-end ports – Two 6 Gbps SAS ports
• Front-end ports – Fibre Channel ports, iSCSI ports, or SAS ports
• MGMT port – Embedded Ethernet/iSCSI port that is typically used for system
management
• REPL port – Embedded iSCSI port that is typically used for replication to
another Storage Center
• Serial port – Used for initial configuration and support functions
4 Cooling fan fault indicator
(2)
• Off – Normal operation
About the SC4020 Storage System 11
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