How to diagnose and fix the 58030 io_error error code in Postgres.

The 58030 error code in PostgreSQL represents an io_error, which generally indicates that there has been a problem with input/output operations, such as reading from or writing to the disk. This error can be caused by a variety of issues, including hardware failures, filesystem problems, insufficient permissions, or issues with the PostgreSQL data directory.


  1. Check the PostgreSQL server logs for detailed error messages related to the I/O error.
  2. Review system logs and dmesg for any hardware or filesystem errors that coincide with the PostgreSQL error.
  3. Verify that the disk is not full and that there is enough space for PostgreSQL to operate.
  4. Confirm that the permissions and ownership of the PostgreSQL data directory and its contents are correct and that the PostgreSQL process has read/write access.
  5. Check for any external factors that may affect disk access, such as network issues for network-mounted storage or virtual machine storage configurations.


The solution to an I/O error will depend on the underlying cause:

Example 1: Disk space issues

If the disk is full, free up space by removing unnecessary files or by increasing the disk size.

# Check disk usage on Unix-like systems
df -h

# Check the size of the PostgreSQL data directory
du -sh /path/to/your/postgresql/data/directory

Example 2: Filesystem errors

If filesystem errors are detected, you may need to run filesystem repair tools.

# Run filesystem check on Unix-like systems (for example, if PostgreSQL data is on /dev/sda1)
sudo fsck /dev/sda1

Example 3: Permissions and ownership problems

Ensure that the PostgreSQL data directory has the correct permissions and ownership.

# Change ownership to the postgres user (replace with actual PostgreSQL user if different)
sudo chown -R postgres:postgres /path/to/your/postgresql/data/directory

# Set appropriate permissions
sudo chmod -R 700 /path/to/your/postgresql/data/directory

Example 4: Hardware failures

If hardware issues are suspected, such as a failing disk, you may need to replace the hardware and restore data from backups.

Example 5: Network storage issues

For network-mounted storage, ensure that the network connection is stable and that the storage is properly mounted and accessible.

# Check the mount status on Unix-like systems
mount | grep postgres

# If necessary, remount the storage
sudo mount /path/to/your/postgresql/data/directory


  • Regularly back up your PostgreSQL data to avoid data loss in case of severe I/O errors.
  • Monitor the health of your disks and replace them proactively if they show signs of failure.
  • If you’re running PostgreSQL in a virtualized environment, ensure that the storage backend is properly configured and performing well.
  • Always perform filesystem checks and disk operations with caution, and consider taking a backup before making changes.
  • If you’re not comfortable diagnosing or fixing hardware issues, seek assistance from a system administrator or hardware specialist.

By following these steps and making the necessary adjustments based on the specific I/O error encountered, you can fix the 58030 io_error code in PostgreSQL. For more information on PostgreSQL I/O and error handling, you can refer to the PostgreSQL documentation and the PostgreSQL Error Codes.

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