Administering volumes 269

Monitoring and controlling tasks

generated when the task completes. When this occurs, the state of the task is printed as EXITED.

pause Puts a running task in the paused state, causing it to suspend operation.resume Causes a paused task to continue operation.

set Changes modifiable parameters of a task. Currently, there is only one modifiable parameter, slow[=iodelay], which can be used to reduce the impact that copy operations have on system performance. If slow is specified, this introduces a delay between such operations with a default value for iodelay of 250 milliseconds. The larger the value of iodelay that is specified, the slower is the progress of the task and the fewer system resources that it consumes in a given time. (The slow attribute is also accepted by the vxplex, vxvol and vxrecover commands.)

Using the vxtask commandTo list all tasks currently running on the system, use the following command:#vxtask list

To print tasks hierarchically, with child tasks following the parent tasks, specify the -hoption, as follows:

#vxtask -h list

To trace all tasks in the disk group, foodg, that are currently paused, as well as any tasks with the tag sysstart, use the following command:

#vxtask -g foodg -p -i sysstart list

Use the vxtask -p list command lists all paused tasks, and use vxtask resume to continue execution (the task may be specified by its ID or by its tag):

#vxtask -p list#vxtask resume 167To monitor all tasks with the tag myoperation, use the following command:#vxtask monitor myoperationTo cause all tasks tagged with recovall to exit, use the following command:#vxtask abort recovall

This command causes VxVM to attempt to reverse the progress of the operation so far. For an example of how to use vxtask to monitor and modify the progress of the Online Relayout feature, see “Controlling the progress of a relayout” on page 299.