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601354 Rev A Normal Operations 4-5
Normal Operation
Command
Priorities
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.
Command
Cancellation
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.