Backup power communication
Example implementations relate to backup power communication. For example, a system for backup power communication can include a shared backup power supply coupled to a node, a plurality of loads supported by the node, and a pass-through device to support multi-master communication between the shared backup power supply and the plurality of loads.
1. A non-transitory machine readable medium storing instructions executable by a processing resource of a shared backup power supply to:
send, by the shared backup power supply to a plurality of loads of a node, a request using and through a pass-through device supporting a multi-master communication protocol permitting the shared backup power supply and the pass-through device to, as master devices, both control the loads as slave devices to the master drives;
receive, by the shared backup power supply, a response from the plurality of loads, the responses identifying a subset of the plurality of loads that are to be protected by the shared backup power supply; and
communicate by the shared backup power supply to the subset, backup power information using the multi-master communication protocol on the pass-through device.
2. The medium of claim 1 , wherein the backup power information includes a message indicating that the shared backup power supply has a threshold level of power to supply backup battery power for the subset.
3. The medium of claim 1 , wherein the backup power information includes a message to enable a first portion of loads among the subset of loads and to disable a second portion of loads among the subset of loads as the shared backup power supply charges.
4. The medium of claim 1 , the shared backup power supply to send messages to other shared backup power supplies indicating at least one of:
a charge status of the shared backup power supply; and
a output status of the shared backup power supply.
5. The medium of claim 1 , wherein the backup power information includes a message from the shared backup power supply to the subset indicating a sequence of delivery of backup power to the subset during backup.
6. The medium of claim 5 , wherein the backup power information includes a message from the shared backup power supply to the subset instructing a second load among the subset of loads to remain in a retaining mode until a first load among the subset of loads has completed a data backup.
7. The medium of claim 1 , wherein the pass-through device is a baseboard management controller (BMC) communicatively connected to both the shared backup power supply and the loads of the node.
8. A method comprising:
sending, by a shared backup power supply to a plurality of loads of a node, a request using and through a pass-through device supporting a multi-master communication protocol permitting the shared backup power supply and the pass-through device to as master devices both control the loads as slave devices to the master drives;
receiving, by the shared backup power supply, a response from the plurality of loads, the responses identifying a subset of the plurality of loads that are to be protected by the shared backup power supply; and
communicating, by the shared backup power supply to the subset, backup power information using and through the multi-master communication protocol on the pass-through device.
9. The method of claim 8 , wherein the backup power information includes a message indicating that the shared backup power supply has a threshold level of power to supply backup battery power for the subset.
10. The method of claim 8 , wherein the backup power information includes a message to enable a first portion of loads among the subset of loads and to disable a second portion of loads among the subset of loads as the shared backup power supply charges.
11. The method of claim 8 , the shared backup power supply to send messages to other shared backup power supplies indicating at least one of:
a charge status of the shared backup power supply; and
a output status of the shared backup power supply.
12. The method of claim 8 , wherein the backup power information includes a message from the shared backup power supply to the subset indicating a sequence of delivery of backup power to the subset during backup.
13. The method of claim 12 , wherein the backup power information includes a message from the shared backup power supply to the subset instructing a second load among the subset of loads to remain in a retaining mode until a first load among the subset of loads has completed a data backup.
14. The method of claim 8 , wherein the pass-through device is a baseboard management controller (BMC) communicatively connected to both the shared backup power supply and the loads of the node.
15. A backup power supply comprising:
communication hardware to communicate with a plurality of loads of a node and with a pass-through device supporting a multi-master communication protocol permitting the shared backup power supply and the pass-through device to as master devices both control the loads as slave devices to the master drives;
a processing resource to:
send, to the plurality of loads of a node, a request using and through the pass-through device;
receive a response from the plurality of loads, the responses identifying a subset of the plurality of loads that are to be protected by the shared backup power supply; and
communicate, to the subset, backup power information using and through the multi-master communication protocol on the pass-through device.
16. The backup power supply of claim 15 , wherein the backup power information includes a message indicating that the shared backup power supply has a threshold level of power to supply backup battery power for the subset.
17. The backup power supply of claim 15 , wherein the backup power information includes a message to enable a first portion of loads among the subset of loads and to disable a second portion of loads among the subset of loads as the shared backup power supply charges.
18. The backup power supply of claim 15 , the shared backup power supply to send messages to other shared backup power supplies indicating at least one of:
a charge status of the shared backup power supply; and
a output status of the shared backup power supply.
19. The backup power supply of claim 15 , wherein the backup power information includes a message from the shared backup power supply to the subset indicating a sequence of delivery of backup power to the subset during backup.
20. The backup power supply of claim 19 , wherein the backup power information includes a message from the shared backup power supply to the subset instructing a second load among the subset of loads to remain in a retaining mode until a first load among the subset of loads has completed a data backup.