Re: HMC Question

[Larry Bolhuis <lbolhuis@xxxxxxxxxx>]

> We will probably just put our existing UPS's on top of the rack to power 
> the xSeries and keep it simple.
   Um, UPSs on TOP of a 7 ft rack?  That sounds slightly dangerous to 
me but it's not my computer room!!

   One other thing, don't plug one UPS into another UPS. This is easy 
to do when you have several small ones but is very bad for the UPS 
that's getting doubled up on!  One of our customers had this setup and 
wondered why 'that big AS/400 UPS never EVER lasts as long as all the 
ones for the NT and other servers. What gives?'  You can guess 
why.....   Also each UPS needs it's own circuit from the panel.  Them 
darn things draw a BUNCHFULL more power after an outage (to charge the 
batteries while still carrying the load)  and of course that's when 
you'd trip the breakers when there is more than one on a circuit (and 
coincidentally when you need it most!)

 - L

> Mark
>
>
> midrange-l-bounces@xxxxxxxxxxxx wrote on 08/18/2004 04:45:20 PM:
>
>  
>
> > Mark,
> >
> >  It's actually:
> >
> >    Wall - > UPS - > PDU - > All your stuff.  Optionally you can also 
> > plug some of your stuff directly into the UPS if you'd like. 
> >
> >    As for capacity you need to 'do the math' again and total up all the 
> >    
>
>  
>
> > requirements of the servers, HMC, etc to find out if it's got enough 
> > juice. Plan B is to plug it all in and see if the magic smoke comes 
> > out.  I don't think that would make Cole happy though!!
> >
> >   - Larry
> >
> > Mark Phippard wrote:
> >
> >    

--
Larry Bolhuis                   IBM eServer Certified Systems Expert:
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