HP XP P9500 Storage - Manual (Page 74)

Procedure 24 To perform a planned outage of a secondary system or data path component
1. Identify the Continuous Access Synchronous P-VOLs that are paired with S-VOL in the secondary
system that is to be powered off.
For data path outage, identify all P-VOLs in the primary system that use the path or component
to be powered off.
You need to know the MCU, CU, and ID (port, GID, LUN) for each of the P-VOLs.
2. Connect to each primary system that contains affected P-VOLs, and split all affected Continuous
Access Synchronous pairs. Confirm the changed pair status.
3. Perform the planned outage of the secondary system or data path.
4. When the secondary system is fully powered on and ready, resynchronize the affected pairs
at each primary system. Confirm the pair status changes.
Planned outage of both primary and secondary system
When you plan an outage of a Continuous Access Synchronous primary and one or more secondary
systems at the same time, the primary system must be powered off first, and powered on last.
Procedure 25 To perform a planned outage of Continuous Access Synchronous primary and
secondary system
1. Perform the planned outage of the primary system first. Because a planned outage does not
affect Continuous Access Synchronous pairs, nothing out of the ordinary must be done
regarding the Continuous Access Synchronous system or operations. Do not power on the
primary system at this time.
2. If a secondary system to be powered off is connected to a primary system that is not powered
off, split the Continuous Access Synchronous pairs before powering off the secondary system.
Confirm that the pair status changes.
3. Perform the planned outage of the secondary system as described in Planned outage of the
secondary system or data path (page 73) .
4. Power on the secondary system. Make sure that they are fully operational and ready to
resynchronize operations before powering on the primary system.
5. Power on the primary system, and make sure it is ready to resynchronize operations. If you
split any pairs in step 2, you can also resynchronize (pairresync) those pairs now.
Miscellaneous maintenance
The following topics provide miscellaneous maintenance information and procedures.
Media maintenance
A pair must be suspended before performing media maintenance on the P-VOL. Write operations
to the P-VOL that specify normal authorization are duplicated on the S-VOL. Write operations with
diagnostic or device support authorization are completed at the P-VOL only.
74 Monitoring and maintenance