[dm-devel] Barriers still not passing on simple dm devices...

[Eric Sandeen]

Lee Revell wrote:
> On Sun, Apr 5, 2009 at 7:54 AM, Ric Wheeler <ricwheeler at gmail.com> wrote:
>> One thing to point out here is that there are a lot of "servers" in high end
>> data centers that do not have UPS backup. Those racks full of 1U and 2U
>> boxes that are used to make "grids", "clouds" and so on often are built with
>> as much gear as you can stuff in a rack - no batteries or UPS to be seen, so
>> they are really quite similar to the normal desktop or home systems that we
>> normally run at home :-)
> 
> These days even bargain basement data centers provide UPS functionality for
> you, via generator backup and A/B power.
> 
> Lee

In that case, you can turn off barriers.  It's still no excuse, IMHO,
for us to ship a journaling filesystem configuration which is known to
corrupt on power loss, by default.

-Eric