Battery

The battery provides uninterrupted power to the node during an unscheduled power loss.

SAN Volume Controller 2145-SV1 and SAN Volume Controller 2145-DH8 nodes contain two batteries that provide power to the node when an unforeseen loss of AC power occurs. The batteries are connected to the main node. When AC power to the node is interrupted, the backup power protection is automatically activated. The node receives an uninterrupted supply of power so that it can write cache data and metadata to the disk drives.

Note: If AC power is restored after the system state dump has started, the dump will continue to completion, then the node will reboot and rejoin the system. If this power is lost for less than 5 seconds, the node remains active in the system and the dump is not started; this process is known as an "AC ride-thru."

The batteries are located in the front of the node. While the node is running, batteries can be removed and installed during the following conditions:

Battery protection is not active and the node is in the Service state. You can check the current state of the node by running the sainfo lsservicestatus command. Both batteries can be swapped in this instance.
Battery is not discharging or reconditioning. You can check for either state by running the svcinfo lsnodebattery command and checking the charging_status value.

If these conditions are not met and you attempt to remove or install a battery, the node might automatically enter the Service state. If the node is powered by one battery during a full system state dump, the node might shut down.

To determine whether it is safe to remove the battery, issue the following chnodebattery command.

svctask chnodebattery -remove -battery battery_id node_id

If it is not safe to remove the battery, the command fails with a BATTERY_NOT_REDUNDANT error code.

Figure 1 shows the battery locations on a 2145-SV1 node. Each battery has a fault indicator; however, only the fault indicator for battery 2 is shown in the figure.

Figure 1. Location of batteries and indicators on a 2145-SV1 node

1 Batteries
2 Battery Fault indicator

Figure 2 shows the location of the battery fault and status indicators on a 2145-DH8 node.

Figure 2. Location of batteries, battery fault, and status LEDs on a 2145-DH8 node

1 Battery 1
2 Battery 2
3 Battery Fault LED
4 Battery Status LED

If a battery fails, its Battery Fault LED lights. You can identify a battery by using the management GUI or by running the chnodebattery -identify CLI command. The Battery Fault LED flashes on the identified battery.

Each battery has a single LED on its bezel, called the Battery Fault LED. It is lit solid if a fault is on the battery. The LED flashes if the battery is being identified.

Note: A Battery Fault LED that is not lit does not indicate that the battery is actively providing protection. You must run the svcinfo lsnodebattery command to determine protection status.