Administrative Tasks

Command Priorities

Command Cancellation

All VolServ commands are executed as they are sent. However, a command queue keeps track of commands that arrive when VolServ resources are busy.

Note that each command is associated with an execution priority that ranges from 0 to 32 (high to low). The default priority for each command is 15. Unless changed by a client, all commands have a priority of 15. Commands with equal priority are executed in a first-come first-served order.

To expedite a particular command in the queue when VolServ resources are busy, the reprioritize request command is used. When a command priority is changed to a higher value (that is, numerically smaller), its position in the queue is moved closer to first place.

Commands can be reprioritized via the GUI and API. The reprioritize request parameters are the reprioritize request identifier and new priority. The new priority replaces the previous command priority in VolServ execution queue.

Any command in VolServ command queue, except the dismount command, can be cancelled. Commands can be cancelled via the GUI and API. The only cancel request parameter is the cancel request identifier. When executed, the command is removed from VolServ command queue.

601354 Rev A

Normal Operations

4-5

Normal Operation

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ADIC 601354 manual Command Priorities, Command Cancellation

601354 specifications

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