HP 3PAR Policy Manager Software - Manual (Page 41)

A.3
3PAR Policy Advisor User’s Guide
How does Policy Advisor handle virtual volumes that provision space from CPGs with
Shared LDs?
■ If the groups of LDs associated with virtual volumes created with the -cnt option have an
inefficient layout, all of the virtual volumes associated with the LDs will be suggested for
tuning. One side effect of these tuning operations is that the virtual volumes will have
individual groups of LDs after the tuning operations complete. The virtual volumes will no
longer share LDs.
What happens if I cancel the Policy Advisor during the analysis phase?
■ The Policy Advisor analysis phase only suggests recommended tuning operations, so
canceling it with Ctrl-C will have no effect on the system. There is also no affect on the
system if host connectivity is lost during the analysis phase.
What happens if I cancel the Policy Advisor during the tuning phase?
■ If you cancel the Policy Advisor script with Ctrl-C , or if host connectivity is lost during the
tuning phase, any active tuning operations started by the script will continue to
completion. New tuning operations will not be started.
How do other tuning operations running on the system affect Policy Advisor tuning
operations?
■ If other tuning operations are running on the system, they count towards the maximum
number of tasks set by the Policy Advisor, and they will delay the start of new tuning
operations suggested by the Policy Advisor.
■ If tuning operations are started manually while the Policy Advisor is in the tuning phase,
the manual tuning operations will be scheduled and interleaved with the Policy Advisor
tuning operations. If the number of scheduled manual tuning operations exceeds the
maximum number of tasks set by the Policy Advisor, then the Policy Advisor will not start
any new tuning operations until the number of running and scheduled tuning operations
drops below the maximum number of tasks set by the Policy Advisor.
■ Policy Advisor excludes virtual volumes that are being tuned during the analysis phase. If
you start a manual tuning operation on a virtual volume which Policy Advisor then tries to
tune, the Policy Advisor tuning operation will fail. This will not affect any tuning operations
which Policy Advisor has scheduled, provided that the manual tuning operations do not
affect virtual volumes scheduled to be tuned by the Policy Advisor.
■ The more tuning operations that are running on a system, the longer it takes for all tuning
operations to complete.