Troubleshooting
Problem
IBM had identified a code defect in the vol_copy optimization procedure, in which if the following conditions are met, an undetected data corruption might occur when reading the data, or a multiple cache failure might occur when attempting to write data, that can lead to loss of access:
- A volume is created by the user using the vol_copy command, and the source and destination volumes share a partition that is mostly populated with zeros.
- The non-zeroed part of the shared partition is written with zeros using the write_same command as designed.
- The system performs an automatic data redistribution, resulting in the secondary copy of the partition to be promoted from backup to primary.
- If the host reads from that partition - an undetected data corruption might occur.
If attempting to write to that partition - multiple cache failures might occur which may lead to loss of access.
Affected Systems
A9000/R systems, running code version 12.3.0 to 12.3.2.b.
Fix
A code fix to prevent such cases is included in 12.3.2.c - released on January 18, 2021.
Reference: SYS-316205
Mitigation and IBM Recommendation
- Upgrade to version 12.3.2.c as soon as possible
- If your system is on an affected version, in order to prevent the issue from occurring, open a service call with IBM or contact your IBM Technical Advisor should you have one assigned, or your IBM Representative, or IBM Support.
For any question about this communication, contact your IBM Technical Advisor should you have one assigned, or your IBM Representative.
Document Location
Worldwide
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Document Information
Modified date:
22 June 2022
UID
ibm16405744