chrismurphy added a new comment to an issue you are following:
Flipping from one to the other will take free space somewhere for the 'atomic storage
export/import' operation to temporarily store docker images and containers to.
A way around the xfs lack of shrink issue is to put the filesystem containing /var onto a
thinly provisioned LV (be it a dir on rootfs or its own volume). After 'atomic storage
reset' wipes the docker storage, issue fstrim, and all the previously used extents
will be returned to the thin pool, which can then be returned to the VG, which can then be
reassigned to a new docker thin pool. Convoluted in my opinion, but doable.
The problem I'm having migrating from devicemapper to overlay is add /var to fstab
isn't working. Systemd picks it up, but no mount command is issued. Seems like
there's a problem making sure it happens after ostree switchroot as there's no
/var directory prior to the ostree rootfs being setup.
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