MISCONF Redis Origin: Data Last updated 14 Oct 2026

Redis: MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk

Redis couldn’t write its RDB snapshot (disk full, permissions, fork failed), so it blocks writes to protect data.

Exact message you may see MISCONF Redis is configured to save RDB snapshotsunable to persist to disk
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Seen on: Redis

Meaning

Background save (BGSAVE) failed. Check the Redis log: no space left, wrong ownership of the data directory, or fork failing due to memory overcommit settings.

Common causes

  • Disk full
  • Data directory not writable by redis user
  • fork() failed (vm.overcommit_memory=0 and low memory)
  • Directory changed by CONFIG SET dir

⚡ Quick fix

  1. Free disk space / fix directory permissions
  2. Set vm.overcommit_memory=1
  3. Check the log (/var/log/redis/redis-server.log)

Detailed fix by platform

Shell

  1. bash
    redis-cli CONFIG GET dir
sudo chown -R redis:redis /var/lib/redis
sudo sysctl vm.overcommit_memory=1
redis-cli BGSAVE

How to diagnose

  1. Log — Reason for failed save
  2. Disk — df -h
  3. Permissions — Data dir owner

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Data. Errors that are often confused with or caused by this one (click to open):

No space left on device (inodes) — No space left on device, but df shows free space (inodes exhausted) (Linux)No space left on devi…OOM command not allowed — Redis: OOM command not allowed when used memory > 'maxmemory' (Redis)OOM command not allow…READONLY You can't write against a read only replica — Redis: READONLY You can't write against a read only replica (Redis)READONLY You can't wr…MISCONF

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