HP XP7 Storage - Manual (Page 38)

Table 6 System option modes
Description Mode
Mode 20 ON: Enables the read option and VOLSER of the suspended S-VOL to be
updated. 20
Mode 20 OFF: Normal operations are performed.
Allows dynamic port mode setting (initiator/RCU target for fibre channel) through PPRC
CESTPATH and CDELPATH commands. 114
Primary/secondary systems: This SOM applies only to the primary system.
Mode 114 ON: Initiator ports automatically change to RCU target ports, and RCU
target ports automatically change to initiator ports.
Mode 114 OFF (default): Initiator ports do not automatically change to RCU target
ports, and RCU target ports do not automatically change to initiator ports.
For fibre channel interface, do not use the CESTPATH and CDELPATH commands at the
same time as the SCSI path definition function of LUN Manager. The fibre channel
interface ports need to be configured as initiator ports or RCU target ports before the
CESTPATH and CDELPATH commands are issued.
Even when this SOM is ON, the ports do not automatically change when the ports are
in initiator/external mix mode.
Caution: Before issuing the CESTPATH command, you must make sure that the relevant
paths are offline from the hosts (for example, configure the Chipid offline, or deactivate
the LPAR, or block the port in the ESCD). If any active remote paths still exist, the add
path operation will fail because the port mode cannot be changed.
Mode 190 ON: By setting this mode and mode 20 to ON, you can update VOLSER
and VTOC of the suspended S-VOL. 190
Mode 190 OFF: Operations run normally.
Controls reporting of SIM reference code (RC) = 2180. 308
Determines whether the storage system reports SIM RC 2180 (remote I/O path failure
between primary and secondary systems) to the host.
This SOM applies only to the primary system.
Mode 308 ON: The storage system reports SIM RC 2180, which is compatible with
older Hitachi specification.
Mode 308 OFF (default): Reporting is compatible with IBM - Sense Status report of F5.
The storage system reports SSB with F/M = F5, and SIM RC 2180 is not reported.
When the SVP detects a blocked path: 448
Mode 448 ON: an error is assumed and the mirror is immediately suspended.
Mode 448 OFF: If the path does not recover within a specified period of time, an error
is assumed and the mirror is suspended.
Note: Mode 448 setting is available only when mode 449 is set to OFF.
Mode 449 ON: The SVP does not detect blocked paths. 449
Mode 449 OFF: The SVP detects blocked paths and monitors the time until the mirrors
get split (suspended).
It is strongly recommended that the path between the main and secondary storage
systems have a minimum data transfer speed of 100 Mbps. If the data transfer speed 466
falls to 10 Mbps or lower, Cnt Ac-J Z operations cannot be properly processed. As a
result, many retries occur and Cnt Ac-J Z pairs may be suspended. This SOM is provided
to ensure proper system operation for data transfer speeds of at least 10 Mbps.
ON: Data transfer speeds of 10 Mbps and higher are supported. The JNL read is
performed with 4-multiplexed read size of 256 KB.
OFF (default): For conventional operations. Data transfer speeds of 100 Mbps and
higher are supported. The JNL read is performed with 32-multiplexed read size of 1
MB by default.
Note: The data transfer speed can be changed using the Change JNL Group options.
38 Planning volumes, XP7 systems