sergey-safarov commented on issue #1119: Could not open shard URL: https://github.com/apache/couchdb/issues/1119#issuecomment-362465655 Joan (@wohali) on provided link is not used volumes and used disk image via loopback + docker filesystem overlay. You example is not applicable to this ticket. On my host is installed Fedora 27 operation system. For Fedora is [recommended](https://docs.docker.com/storage/storagedriver/select-storage-driver/) > |Linux distribution |Recommended storage drivers | > |-------------------|--------------------------------------------------------------------------------------| > |Docker CE on Fedora|devicemapper, overlay2 (Fedora 26 or later, experimental), overlay (experimental), vfs| > >When possible, overlay2 is the recommended storage driver. When installing Docker for the first time, overlay2 is used by default. But i use `volume` as permanent store for couchdb data and according this [page](https://docs.docker.com/storage/storagedriver/#data-volumes-and-the-storage-driver) is not mater what is used storage driver > A data volume is a directory or file in the Docker host?s filesystem that is mounted directly into a container. Data volumes are not controlled by the storage driver. Reads and writes to data volumes bypass the storage driver and operate at native host speeds. I have googled about slow disk operation inside docker container. I find only related to docker for MacOS (not linux). Also i have made test inside docker container ``` [root@node0 ~]# docker run --rm -it -v test:/home fedora:27 /bin/sh sh-4.4# date; dd if=/dev/zero of=/home/test.img bs=1G count=10; date Fri Feb 2 02:19:51 UTC 2018 10+0 records in 10+0 records out 10737418240 bytes (11 GB, 10 GiB) copied, 5.12558 s, 2.1 GB/s Fri Feb 2 02:19:56 UTC 2018 sh-4.4# ``` Results is same to test on host operation system.
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