Exadata systems using Grid Infrastructure July 2020 19.8, 18.11, and 12.2.0.1 may experience clusterware failure to start or database instance hang on one or more nodes in the cluster due to "Dropping commit cache ioctl" (Doc ID 2741505.1)

Last updated on SEPTEMBER 27, 2021

Applies to:

Symptoms

Exadata systems using Grid Infrastructure July 2020 19.8, 18.11, or 12.2.0.1 may experience clusterware failure to start or database instance hang on one or more nodes in the cluster.

The following conditions must exist for this issue to occur:

1. A database uses storage servers with mixed Exadata versions, or uses non-Exadata storage (e.g. ZFS, ACFS) for one or more database files.
   1. In the case of storage servers with mixed Exadata versions:
      1. Most storage servers use one of the following versions:
         
         1. 20.1.0 or higher 20.1
         2. 19.3.13 or higher 19.3
         3. 19.2.19 or higher 19.2
         4. 18.1.31 or higher 18.1
      2. One or two storage servers use a version older.
2. Grid infrastructure home is version 19, 18, or 12.2.0.1 running July 2020 Release Update
3. Database home is version 19, 18, or 12.2.0.1 running July 2020 Release Update

Symptoms include the following:

1. Database instance, ASM instance, or clusterware startup hang.
2. RMAN DUPLICATE DATABASE hang.
3. Database alert log reports the following:
     

See <Document 31718134.8> for additional details. 

Cause

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