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601354 Rev A Normal Operations 4-23
Normal Operation
The vary drive command also allows a drive to be moved to
the on-line state and clear two of four drive statistics. These
statistics are the current usage time and error count. Refer to
“Create a Drive” on page 3-32 for more information about drive
statistics.
A drive can be in one of four states: on-line, off-line,
diagnostic, and unavailable. The first three states are
entered by human intervention. The unavailable state is
determined by VolServ software.
The on-line state is the normal operational state. A drive is
inoperable when in the off-line state. The diagnostic
state is used to allow local manual control. This mode is
generally used during troubleshooting.
The unavailable state is a logical state entered when certain
critical equipment is moved to the off-line state. For
example, a drive is in the unavailable state when the
cassette load mechanism (CLM) is off-line.
The vary drive command is available over the GUI, CLI, and
API. The vary drive state parameters are the vary drive, new
state, and priority. The priority is used to determine the
command location in VolServ command queue.