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

[Ric Wheeler]

On 04/05/2009 06:14 PM, Lee Revell wrote:
> On Sun, Apr 5, 2009 at 7:54 AM, Ric Wheeler<ricwheeler@xxxxxxxxx>  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

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