Re: [atomic-devel] Fedora 26 change: using overlayfs as default

[Vivek Goyal <vgoyal redhat com>]

On Thu, Jan 05, 2017 at 04:16:45PM -0800, Josh Berkus wrote:
> So, I've done some testing, thanks to Dusty's setup.
> 
> I wasn't able to test on Kubernetes because of some setup issues.
> However, I hammered away at Docker using some IO-intensive applications,
> including PostgreSQL and Etcd, both of which write data frequently to
> some unexpected places.
> 
> So far I haven't seen any unexpected IO errors from containers running
> under overlayfs.
> 
> And having all of storage be one big volume is really nice; it
> eliminates a longstanding issue we've had with disk allocation; the
> whole disk is simply available.
> 
> So +1 on moving to overlayfs for F26.

Nice to hear that Josh. BTW, on fedora server and atomic, overlay storage
will still come from non-root fs partition. That will allow one to switch
back to devicemapper if overlay2 does not work for them.

Vivek