SCF Reference Manual for the Kernel Subsystem

Changing Software Data Integrity Checking
Beginning with the H06.20 and J06.09 RVUs, the system can detect situations in which a message
request buffer is modified due to a programming error or inadvertent data corruption. Depending
on the value of the AUTO_RETRY_ON_ERROR_654 attribute, the system can either immediately
report file system error 654 or retry sending the request up to three times:
• A value of ON causes the system to retry the request up to three times.
• A value of OFF causes the system to immediately report file-system error 654 without performing
retries.
For more information, see AUTO_RETRY_ON_ERROR_654 (page 96).
To turn on auto retries:
1. As a precaution, save the current configuration file with an SCF SAVE command (documented
in the SCF Reference Manual for G-Series RVUs or the SCF Reference Manual for J-Series and
H-Series RVUs.
For example, use this command to save the current configuration file in a file at the location
$SYSTEM.ZSYSCONF.CONF0106:
-> SAVE CONFIGURATION 1.6
2. View the current settings for the AUTO_RETRY_ON_ERROR_654 attribute with an SCF INFO
command:
-> ASSUME SUBSYS $ZZKRN
-> INFO
NONSTOP KERNEL - Info SUBSYS \EAST.$ZZKRN
Current Settings
*DAYLIGHT_SAVING_TIME ................ USA66
*NONRESIDENT_TEMPLATES................ $SYSTEM.SYSTEM.NRTNEW
*POWERFAIL_DELAY_TIME................. 30
*RESIDENT_TEMPLATES................... $SYSTEM.SYSTEM.TNEW
SUPER_SUPER_IS_UNDENIABLE............ OFF
*SYSTEM_NAME.......................... \EAST
*SYSTEM_NUMBER........................ 254
SYSTEM_PROCESSOR_TYPE ............... NSR-W
*TIME_ZONE_OFFSET..................... -8:00
*TNSMISALIGN.......................... FAIL
*DESTINATION_CONTROL_TABLE............ SMALL
*TLE_LIMIT............................ 2000
*AUTO_RETRY_ON_ERROR_654.............. OFF
3. To enable automatic retries, change the AUTO_RETRY_ON_ERROR_654 attribute using ALTER
command. For example:
-> ALTER, AUTO_RETRY_ON_ERROR_654 ON
This change takes effect immediately.
4. Confirm the change with another INFO command. For example:
-> INFO
If you need to reverse this operation, repeat the ALTER command using the original value.
Changing Software Data Integrity Checking 37