Why MySQL Errcode 28 Can Appear Even With Plenty of Disk Space

A MySQL fatal error claiming "Can't create/write to file ... (Errcode: 28)" turned out not to be a lack of disk space but exhausted inodes caused by millions of tiny maildrop files generated by cron‑driven Postfix notifications, and the article walks through the investigation and fix.

Errcode28croninodes

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Why MySQL Errcode 28 Can Appear Even With Plenty of Disk Space

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May 20, 2016 · Operations

Why MySQL Errcode 28 Happens Even With Free Disk Space—and How to Fix It

A MySQL fatal error citing Errcode 28 can stem from inode exhaustion caused by a flood of cron-generated emails, not just lack of disk space, and the article walks through diagnosing the issue with df, df -i, and locating the offending Postfix maildrop directory.

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Why MySQL Errcode 28 Happens Even With Free Disk Space—and How to Fix It