Red Alert: Potential loss of data for DB2 v10 users on z/OS 1.12 and 1.13 releases

Cuneyt Goksu

Red Alert: Potential loss of data for DB2 v10 users on z/OS 1.12 and 1.13 releases




Users Affected:

DB2 V10 and PDSE users potentially affected by error in z/OS Media Manager
IO recovery. Users of zDMF running zHPF may be particularly exposed because
all I/O requests are intercepted by zDMF and returned to Media Manager in
error for IO redrive using FICON, however any I/O errors, including
interface control check and unit checks, that are retried by the media
manager are also subject to the problem.

Description:

There are certain situations where the Media Manager will redrive the failed
channel program with a different type of channel program. In some highly
timing dependant cases, such as with I/Os that cross extents, the redrive
may not occur correctly, and no error is presented to the caller,
potentially leading to data being down level on disk. The problem may occur
for DB2 V10 or PDSE data sets. Please see APAR OA42277 for more details.

Recommended Actions:

Apply ++APAR or PTFs for OA42277. Activation requires re-IPL of the system.

Also please do not use zDMF until the fix for OA42277 is applied.