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Milvus etcd and MinIO Dependency Errors

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Workaround available Docker, Kubernetes Updated November 15, 2026Based on 4 user reportsHow we research

Quick answer

Slow or full etcd and object storage disks cause crash loops. Use fast disks, clear space and dedicate etcd storage.

Most likely fix: Check etcd disk speed

How to fix it

Try these in order — the most common fix is first.

  1. 1. Check etcd disk speed

    1. Docs target over 500 IOPS and under 10 ms p99 fsync latency
    2. Test with fio using --fdatasync=1
    3. Use local NVMe for etcd
    Did this fix it?

  2. 2. Clear a NOSPACE alarm

    1. etcdctl alarm list
    2. Compact and defragment etcd
    3. etcdctl alarm disarm
    Did this fix it?

  3. 3. Free disk

    1. Check host disk and MinIO console at :9001
    2. Lower dataCoord.gc.dropTolerance to reclaim deleted data sooner
    Did this fix it?

Symptoms

Standalone crash-loops; logs show mvcc database space exceeded, lost etcd keepalive, or failed to open WAL.

Why it happens

  • etcd database quota reached (NOSPACE alarm)
  • Slow etcd disk causing elections
  • Full host disk
  • MinIO out of space with vague flush errors

This guide also covers

  • milvus etcd error
  • milvus minio error
  • milvus failed to open WAL

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