Linux: DB Processes may hang when running large "dd" to NFS disk, leading to RAC eviction or crash
(Doc ID 1512914.1)
Last updated on MARCH 05, 2019
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.1 and laterOracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
DB processes (or any other OS process) may hang or stall in nfs_wait channel while an OS process is creating a large file over NFS using "dd".
In RAC, this can mean a stalled background process which in turn leads to instance termination or instance eviction.
Changes
Creating a large zero-padded file over NFS using "dd" WITHOUT using the "oflag=direct" option.
eg:
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |