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

[Ric Wheeler <rwheeler@redhat.com>]

On 04/05/2009 06:14 PM, Lee Revell wrote:
> On Sun, Apr 5, 2009 at 7:54 AM, Ric Wheeler<ricwheeler@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 my experience, you will see multiple customers with and without UPS backup.

I have certainly dealt personally with many data centers that lost power without 
them & see array vendors that continue to build in their own batteries...

ric