Data storage performance scaling based on external energy

A method comprising:

• determining, at a host device, an amount of backup power available to provide to a plurality of devices connected to the host device in case of a power loss event;
• determining priorities of workloads provided from the host device to the plurality of devices;
• determining a backup power distribution among the plurality of devices based on the determined priorities of workloads, including prioritizing backup power distribution to devices from the plurality of devices to which the host device sends streaming data write commands, streaming data write commands including data write commands grouped according to a stream identifier;
• and
• sending an indication to at least one device from the plurality of devices, the indication identifying an amount of backup power available to the at least one device based on the backup power distribution.

A method comprising:

• receiving, at a data storage device, an indication from an external device of power resources available to the data storage device from the external device in case of a power loss event;
• calculating, at the data storage device, a number of data access operations to the nonvolatile memory that can be completed in the event of a power loss based on the indication;
• determining a performance metric of the data storage device to apply when accessing a nonvolatile memory during normal power availability based on the number of data access operations;
• adjusting the performance metric based on the indication;
• and
• performing operations at the data storage device during normal power availability based on the performance metric, the performance metric to apply during normal power availability based on the indication includes returning write completion notifications from the data storage device to a host device for uncompleted buffered write operations at regular intervals during an interruption of write executions at the data storage device.