Friday, January 22, 2010

New Red Alert about Potential DB2 Data Inconsistencies Following a CF Failure

Here's yet another Red Alert :

It concerns sites running DB2 having Coupling Facilities with structure duplexing :
"When a CF terminates the structures on the CF are physically deleted and duplex structures will fail over to the other instance of the structure and simplex structures will rebuild into a new instance of the structure. If the CF comes back up quickly after a CF failure, it is possible, and even likely, that the rebuilding structures will rebuild into the CF that just terminated and came back. While the new instances of the structures are being allocated, XCF may still be cleaning up for the prior instances of structures that were allocated in the CF before the CF failure. As part of the clean up XCF may incorrectly delete record data from the new instance of a lock structure thinking it was cleaning up unneeded data in the prior instance of the structure. When the missing lock structure record data is detected XES will ABEND026 0C090020 IN IXLR1ALR OR ABEND026 0C2A0101 IN IXLR1GRT".
You can read the entire Red Alert and the recommended actions over here.

If you want to have en overview of all past Red Alerts, then take a look over here. You can also subscribe on the same page so you'll be notified by mail of any future Red Alert.

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