HP XP7 Storage - Manual (Page 25)

Requirements
•
System option mode 114 set to OFF.
•
System option mode 484 and 769 set to ON.
•
A bi-directional path between MCU and RCU must be in place.
Recommendations
•
For best performance, the maximum number of pairs for the Basic HyperSwap function is
1,000 per CHA.
•
The MIH value of host I/O and the host operation is about one second. This allows MIH to
be reported for host I/O or for the host operation.
•
Resources in the host system must be adequate. If a shortage occurs, resynchronization of
Continuous Access Synchronous Z pairs may fail.
•
When running the FREEZE command, make sure that it can complete within 20 seconds to
avoid failure. HP recommends configuring your system as follows:
◦ (Number of Host paths) x (Number of LPARs) x (Number of CGROUPs (Number of CUs))
≤ 160
◦ Number of pairs ≤ 4,096
Planning for Extended Address Volume
Extended Address Volume (EAV) can be assigned to a Continuous Access Synchronous Z pair.
EAV is a HP function to define a large capacity VOL that is not supported by existing 3390 type
volumes. You can create a pair with and/or without EAV. The following table shows EAV availability
for P-VOLs and S-VOLs.
S-VOL (Device emulation type) P-VOL
(Device emulation type)
No EAV (3390-X
*1
) EAV (3390-A)
Not available Available EAV (3390-A)
Available Available non-EAV (3390-X
*1
)
1. 3390-X indicates the 3390 series other than 3390-A. For these other supported 3390 emulation types, see the
table in
“System requirements and specifications” (page 13) .
Emulation type 3390 combined with non-3390 device types is not available.
Planning for Extended Address Volume 25