Quiescing an independent disk pool
In an 
IBM® i
high-availability
solution, independent disk pools are used to store resilient data
and applications. Some system functions, such as performing backups,
require that you temporarily suspend changes to that data while the
operation occurs.
To decrease the amount of time it takes to
quiesce an independent disk pool, you might want to hold batch job
queues, end some subsystems, or send a break message to interactive
users, advising them to postpone new work.
To quiesce an independent disk pool, complete
these steps.
In a command line interface, enter the following command: CHGASPACT
ASPDEV(name) OPTION(*SUSPEND) SSPTIMO(30) SSPTIMOACN(*CONT),
where name is the name of the independent disk
pool that you want to suspend. In this command you are specifying
to suspend the independent disk pool with a 30-second timeout, and
to continue with the next step even if the timeout limit has been
exceeded.