HP XP P9500 Storage - Manual (Page 39)

Table 6 System option modes (continued)
Description Mode
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 remote storage systems
have a minimum data transfer speed of 100 Mbps. If the data transfer speed falls to 466
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.
With mode 474 set to ON, improves the initial copy time for a Cnt Ac-J Z pair, by
using the Cnt Ac-S Z initial copy operation. 474
This operation requires use of a script with the following operations:
• Cnt Ac-J Z initial copy operation, with "None" specified for the Initial Copy
parameter.
•
Split the Cnt Ac-J Z pair.
• Cnt Ac-S Z initial copy operation, using the split Cnt Ac-J Z pair volumes.
•
Delete the Cnt Ac-S Z pair.
•
Resynchronize the Cnt Ac-J Z pair.
Using BCM improves performance.
Mode 474 OFF: Operations run normally.
Enables the delta resync operation. 506
Mode 506 ON: The delta resync operation is performed if there are no update I/Os.
Mode 506 OFF: The copy processing of all data is performed if there is no update
I/Os.
When set to ON, changes the displayed consistency time (C/T), FROM the completion
time for journal data that has been restored to a data volume, TO the completion time
for journal data that is copied from the master journal to the restore journal. 530
Mode 530 ON: Copy completion time is displayed in C/T for journal data from the
master journal to the restore journal.
Mode 530 OFF: Copy completion time is displayed in C/T when journal data is restored
to the data volume.
Pair status must be Duplex.
Prevents pair operations of Cnt Ac-S Z, Cnt Ac-J Z, or BC Z via an online command
device. 548
MCU/RCU: This SOM applies to both the MCU and the RCU.
ON: Pair operations of Cnt Ac-S Z, Cnt Ac-J Z, or BC Z via an online command device
are not available. SSB=0x64fb is output.
Guidelines for preparing systems for Cnt Ac-J Z 39