10gR2 RAC hangs and “KSV master wait”

We recently migrated a customer’s 10gR2 RAC on AIX6.1 from GPFS+HACMP to a “basic” Clusterware with datafiles over ASM.
After (many) problems related to various installation bugs (the list of requirements for AIX is very long, incomplete and requires many one-off patches to complete), we had a problem during an import of a new schema: the import hung with no apparent wait events. We found that the event it was waiting for was classified as ‘Idle’:

The on ASM instance:

The problem was related to datafile resize (we use autoextend) and according to MOS, we were encountering a bug:

Bug 11712836: RESIZING DATAFILE HUNG WAITING FOR KSV MASTER WAIT IN RAC

Shutting down one instance solved the problem. Now we have to avoid autoextend……. We never encountered this bug in many 10.2.0.4 rac installations.

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Ludovico

Principal Product Manager at Oracle
Ludovico ia a member of the Oracle Database High Availability (HA), Scalability & Maximum Availability Architecture (MAA) Product Management team in Oracle. He focuses on Fleet Patching and Provisioning (FPP), MAA-optimized software lifecycle management, Cloud MAA and Online Operations.

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