Re: Scalable Mail solution with NAS - Diodes

[SMcGrath () dhhs state nh us]

There are many diodes with multi-amp ratings  you will need a diode rated
at at least 100 PRV (Peak Reverse Voltage) and a current rating of approx
150% of load current (I believe in overdesign!)   Newark, or Mouser
electronics can supply you with one

Regards - Scott

P.S. Remember the DC supply is -48 volts so do not  let negative hit earth
ground or you will be arc welding!





"Kris S. Amundson" <krisa () metstream com>@merit.edu on 01/31/2001 03:19:59
AM

Sent by:  owner-nanog () merit edu


To:   Mike Johnson <mike.johnson () isunnetworks com>, nanog () merit edu
cc:

Subject:  Re: Scalable Mail solution with NAS



Ok, this is my beef with NetApp.  We have a NetApp F720 with a single
disk shelf.  The F720 "brain box" has two power supply units that slide
into the back on the right and left side, each having it's own 48V DC
connectors (about the size of LS1010 power supplies).

Now the disk shelf.  It has two power supplies that slide into the front
and connect into the backplane with no connectors on the front.  A fixed
connector assembly is located on the back.  Just one.  One!

No A side.  No B side.  Just one +/-/GND.  We gave NetApp a call and
their workaround was "you could use a diode and connect both A & B wires
to the unit".  Uhh... thanks. They also told us their design engineer
had already been slapped on the hand, and they are working on their next
version.

It was an interesting gotcha for our server engineer who wansn't too
farmiliar with DC power plants.

Now, does anyone know of a diode that can do 10A at 48V?  Any EE's out
there?

Mike Johnson wrote:

> Patrick Hollowell [phollowell () vnet net] wrote:
>
> > My company is in the process of evaluating several mail solutions,
scalable
> > to 150k to 200k mailboxes.  One thing we'd like to do is run the message
> > store over Gig-E on network attached storage.  Two of the vendors we've
been
> > looking at claim performance issues running this solution over NFS.
Does
> > anyone know of a carrier-class mail solution that will run well on NAS?
>
>
> Take a look at NetApp.  My company (unfortunately) signed an NDA with
> NetApp, but they've posted that Yahoo uses NetApp for their e-mail:
> http://www.netapp.com/partners/catalog.cgi/company/28
>
> Rumor has it (no, I'm not violating my NDA) that Hotmail also uses
NetApp.
> -Plenty- of other large sites use 'em for e-mail.  Just call a NetApp
> sales person and and ask for the list.  It's impressive.  I do believe
> it contains some carrier-class implementations.
>
> Mike