HP XP P9500 Storage - Manual (Page 472)

Table 107 Using a 4x4x4 Cascade Configuration
See Description Target
Maintenance or
Failure
Number
“Performing Primary
Site Storage System Suspend Continuous
Access Synchronous Z Primary site storage
system maintenance Maintenance 1
Maintenance”
(page 474) copy pairs, and then
change the
configuration to a 4x4
configuration
(Intermediate
→
Remote).
“Performing
Intermediate Site Suspend Continuous
Access Synchronous Z Intermediate site
storage system
maintenance 2
Storage System copy pairs, and then
Maintenance”
(page 478) resynchronize them
after maintenance has
finished.
“Performing Remote
Site Storage System Suspend Continuous
Access Journal Z copy Remote site storage
system maintenance 3
Maintenance”
(page 482) pairs, and then
resynchronize them
after maintenance has
finished.
“Performing Primary
Site Host Perform a reverse
resync on Continuous Primary site host
maintenance 4
Maintenance”
(page 484) Access Synchronous Z
copy pairs, and then
change the
configuration to a
4x4x4 Multi- Target
configuration in which
operation is performed
from the intermediate
site.
— Operation in the
4x4x4 Cascade Intermediate site host
maintenance 5
configuration is not
affected.
— Operation in the
4x4x4 Cascade Remote site host
maintenance 6
configuration is not
affected.
“Operating Procedure
During a Primary Site Suspend Continuous
Access Synchronous Z Primary site storage
system failure (volatile) Failure 7
Storage System Failure
(Volatile)” (page 489) copy pairs, and then
change the
configuration to a 4x4
configuration
(Intermediate
→
Remote). The
Continuous Access
Synchronous Z copy
pairs whose S-VOLs
are in the storage
system in which the
failure occurred must
be deleted and then
recreated.
472 Maintenance and troubleshooting operations