HP Surestore Disk Array 12h - And FC60 Manual page 114

Restriction
When controller failover occurs in an
active/active controller pair and ownership of
volumes transfers from the failed preferred
owner to the other controller of the pair. The
failed controller is replaced and brought
online. Until the volume group ownership is
transferred back to the preferred controller
owner, you lose I/O path failover protection for
the second controller.
After installing the Host-Agent software, you
see an error message with "Service Error
100" on the host.
114
Workaround
It may take 5 minutes after the failed controller is
replaced and brought online for a rescan to
detect and return ownership to the preferred
controller.
To ensure I/O path failover protection,
immediately after replacing the controller select
the
option in the Array Management Window to
transfer volume groups back to preferred
controller owners.
For more information, see the Array
Management Window online Help system.
Check these possible causes:
The Host-Agent software does not find any
controllers with firmware version 4.x.
Controllers with firmware version 4.x have the
Access Volume disabled with NVSRAM
configuration settings.
The NVSRAM on controllers in a Storage Array
you are attempting to manage contains an
Access Volume Logical Unit number that is
already in use by another volume.
The NVSRAM on controllers in a Storage Array
you are attempting to manage contains an
Access Volume Logical Unit number that is not
supported by the operating system and installed
patches. (For example, the Access Volume is
configured at LUN 32, but the operating system
and service packs only support 8 LUNs.)