chrismurphy added a new comment to an issue you are following:
``
> vgoyal 
> In short, putting rootfs on thin lv increases complexity of default setup and 
> difficult to recover if something is bad. (thin pool full). Lot of people 
> don't like the idea of doing over provisioning for rootfs. They better have 
> peach of mind with pre-allocated rootfs.

OK got it. Without over provisioning, rootfs on thin LV is the same risk as 
Docker devicemapper using a dm-thin pool; what unacceptably increases risk is 
overprovisioning rootfs which is necessarily what happens when using fstrim on 
it to recoup extents for a devicemapper based reversion. Fair enough. I have 
seen it explode spectacularly with total data loss of all LV's using the thin 
pool and repair tools being unable to repair it; not just the fs that was 
writing at the time the exhaustion happened.
``

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https://pagure.io/atomic-wg/issue/186
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