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

[Josh Berkus <jberkus redhat com>]

On 01/05/2017 04:16 PM, 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.

Also, performance is MUCH better on PostgreSQL pgbench than devicemapper
is.  Like 3X better.


-- 
--
Josh Berkus
Project Atomic
Red Hat OSAS