Oracle Database Error ACFS-03655: Excessive Device Read Failures

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Description

This critical error indicates that the Oracle Automatic Storage Management Cluster File System (ACFS) has encountered too many read failures on a specified underlying storage device. When the configured threshold for read errors is surpassed, ACFS deems the device unreliable and initiates an exit to prevent potential data corruption or system instability. This usually points to severe issues within the storage subsystem.

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Error Message

Too many read failures on device string . Exiting.

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Known Causes

4 known causes

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Underlying Storage Hardware Failure

The physical storage device (e.g., disk, SSD, SAN LUN) connected to ACFS has developed critical read errors or is failing.

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I/O Path or Controller Problems

Issues with the storage controller, Host Bus Adapter (HBA), cabling, or network fabric (for SAN/NAS) are causing persistent I/O failures.

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Outdated or Corrupt Drivers/Firmware

Incompatible, outdated, or corrupt device drivers or firmware for the storage adapter or device can lead to miscommunication and read errors.

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Operating System I/O Errors

The operating system itself is reporting consistent I/O errors to the underlying storage, which ACFS then detects as read failures.

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Solutions

Coming Soon

Detailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:

General Troubleshooting Tips

Check the error message carefully for specific details
Review recent changes that might have caused the error
Search for the exact error code in the official documentation
Check log files for additional context
Try restarting the application or service

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