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My server has very low disk performance if write barrier is enabled. As it has a disk controller with battery for the cache it is safe to add the "nobarrier" option to /etc/fstab. This makes a huge difference in performance. I want to the same for docker, but I'm using device mapper and not a regular partition. How can I disable write barriers in docker when using docker with device mapper?

$ cat /etc/sysconfig/docker-storage
DOCKER_STORAGE_OPTIONS=--storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/fedora-docker--pool
Peter
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1 Answers1

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You must try dm.mountopt=. Just add in your config:

--storage-opt dm.mountopt=nobarrier
Vitaly Yakovenko
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