Exadata ALTER PHYSICALDISK N:N DROP FOR REPLACEMENT is hung (Doc ID 2574663.1)

Last updated on AUGUST 22, 2023

Applies to:

Symptoms

There is a proactive physical disk replacement and using following command, it never finished and just stuck.

CellCLI> ALTER PHYSICALDISK n:n DROP FOR REPLACEMENT

From cell's alert.log file, below are seen ::

.....

2019-06-04T17:17:49.877540+03:00
Flushing data from RamCache to GridDisk RECO_CD_02_celadm03 cannot be done because RamCache is not in write-back mode
Flushing data from FlashCache to GridDisk RECO_CD_02_celadm03 started
2019-06-04T17:17:49.980765+03:00
Flushing data from RamCache to GridDisk DATA_CD_02_celadm03 cannot be done because RamCache is not in write-back mode
Flushing data from FlashCache to GridDisk DATA_CD_02_celadm03 started
2019-06-04T17:18:04.374272+03:00
Flushing data from FlashCache to GridDisk RECO_CD_02_celadm03 (133447004) completed
2019-06-04T17:31:13.768059+03:00
Flushing data from RamCache to GridDisk RECO_CD_02_celadm03 cannot be done because RamCache is not in write-back mode
Flushing data from FlashCache to GridDisk RECO_CD_02_celadm03 started
2019-06-04T17:31:13.820717+03:00
Flushing data from RamCache to GridDisk DATA_CD_02_celadm03 cannot be done because RamCache is not in write-back mode
Flushing data from FlashCache to GridDisk DATA_CD_02_celadm03 started
2019-06-04T17:31:29.921394+03:00
Flushing data from FlashCache to GridDisk RECO_CD_02_celadm03 (133447004) completed         <<<<<<<<<<<<<<< COMPLETED ONLY FOR GRID DISK BELONG TO RECO DISK GROUP

///// END OF FILE

No sign of flush dirty Flash Cache to Grid disk belong to DATA disk group ever to be completed.

Check following command's output show it is decreasing but very slow progress.

CellCLI> list metriccurrent attributes name,metricvalue where name like 'FC_BY_DIRTY';

Changes

 Proactive physical disk replacement

Cause

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