<p>Error 1810 occurs when MySQL cannot read required data from disk or network storage, halting the current operation.</p>
<p>MySQL Error 1810: ER_IO_READ_ERROR signals that the server failed to read data from disk or network storage. Check the OS error code, verify file permissions, examine the storage device for corruption, and retry the query after fixing the underlying I/O issue.</p>
IO Read error: (%lu, %s) %s
Error message: IO Read error: (%lu, %s) %s. The server attempted to read a file or table but the operating system reported a low-level I/O failure. MySQL aborts the current statement to prevent data corruption.
This error can appear during table scans, log reads, index creation, backups, or replication when the storage layer cannot deliver the requested bytes.
Administrators most often see it during large SELECTs, mysqldump, bulk LOAD DATA, or replication relay log reads. Sudden disk failures, bad network-attached storage, or permission changes can all trigger the read failure.
Persistent I/O read errors indicate hardware or filesystem problems that threaten data integrity. Ignoring them can lead to corrupted tables, failed backups, and replication lag, risking downtime and lost data.
Disk hardware faults, filesystem corruption, and sudden permission changes stop MySQL from accessing required files. Network glitches on NFS or SAN storage can drop read requests. Low open-file limits or depleted inodes also surface as read errors.
First, inspect the MySQL error log for the exact OS error code and affected file. Run OS utilities such as dmesg, smartctl, or fsck to confirm disk health. Restore file permissions and SELinux contexts if they changed. Finally, restart the MySQL service after repairing or replacing the storage medium.
If the error arises on a single MyISAM table, copy the .MYD and .MYI files to safe storage and run myisamchk --recover. For InnoDB tablespaces, ensure innodb_force_recovery is unset after you fix the disk, then restart and run OPTIMIZE TABLE.
Use RAID with battery-backed write cache, enable regular SMART monitoring, and configure MySQL datadir on reliable SSDs. Apply strict file permission policies and monitor dmesg for early I/O warnings. Ensure your cloud block storage meets IOPS requirements.
Errors 1296 (ER_GET_ERRMSG) and 1030 (HY000 - got error from storage engine) often accompany low-level I/O faults. The troubleshooting process is similar: isolate the disk or network storage issue and restore healthy media.
Bad sectors, dying SSDs, or a failing RAID array stop MySQL from reading table or log files.
Unexpected shutdowns or power loss damage the filesystem metadata, making reads impossible.
NFS, iSCSI, or SAN timeouts interrupt block reads from remote volumes.
Incorrect chmod, chown, or SELinux relabeling blocks mysqld access to its own data files.
Reaching the OS limit for open files or running out of inodes can surface as read errors.
Generic engine error often surfaced when an I/O read or write fails under InnoDB.
Error retrieving error message - frequently logged when a replication thread hits an I/O failure.
Not an I/O issue but can appear concurrently when the server hangs after repeated read errors.
Clients may see this if the server crashes due to unrecoverable I/O read errors.
Not always. It can also arise from permission changes, NFS timeouts, or hitting the open-file limit. Still, check hardware first.
If replication or backups read from a corrupted file, you may restart only the affected slave or dump process. For primary workloads, plan a brief maintenance window.
Only if the error stems from logical corruption. Hardware faults will surface again until the disk or network path is repaired.
Galaxy’s local-first editor keeps queries on reliable local storage, highlights failed reads instantly, and surfaces permission issues, helping you detect I/O faults early.
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