wohali commented on issue #1119: Could not open shard URL: https://github.com/apache/couchdb/issues/1119#issuecomment-362410116 It's not about the speed of the disk, it's about the *latency* of disk operations from inside of the Docker image. Your log shows that, on occasion, the Docker environment has very slow disk performance. CouchDB performance is directly related to the latency of disk I/O operations. Have you tried using the [device storage mapper device](https://docs.docker.com/storage/storagedriver/device-mapper-driver/#image-layering-and-sharing) on real block devices rather than loopback mounted block devices? See https://github.com/moby/moby/issues/21485 for more information:
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