Hi,
On Tue, May 01, 2001 at 07:46:42PM +1000, Hamish Moffatt wrote:
> On Tue, May 01, 2001 at 11:03:06AM +0200, Russell Coker wrote:
> > On Monday 30 April 2001 00:04, Hamish Moffatt wrote:
> > > I don't see why. Nor is this any different to any external drives.
> > > You have a hefty ground conne
On Wed, May 02, 2001 at 03:24:53PM -0500, Dimitri Maziuk wrote:
> Oh, and (since they sound like the kind of servers that come with
> monitors) don't plug monitors into UPSen.
Uhm, sorry, why not? I have connected a monitor (14", normally turned
off) to our server and to his USV so I can even re
hi ya...
though we are getting slightly off topic...
- dual power supply issues...
the problem is how to connect two power supplies together...
one at 5.25v and the other at extreme of 4.75v
if using just a diode...( no matter what kind - power or schottky )... it
wont work as one diod
On Wed, May 02, 2001 at 03:24:53PM -0500, Dimitri Maziuk wrote:
> On Wed, May 02, 2001 at 08:18:20PM +0100, Matthew Sackman wrote:
> ...
> >
> > Every production server that I've seen that has 2 PSUs has both
> > continuously running. At hopefully < 50% capacity.
>
> Interesting. Could you post
http://www.dell.com/us/en/bsd/products/model_pedge_1_pedge_2550.htm
...Has a system with dual power supplies. If anyone is interested in
putting together a system like that, I suggest they go ahead and buy
one. Otherwise, let's leave the design stuff to the power supply
engineers at Power One and
> Hi!
>
>
> > > at these extremes... the diodes wont helpand the dioes will simply
> > > burn up due to the current it has to pass to get to that "voltage"
> > > one side being a diode drop ( 0.7v ) across itself..
> > > - a power mosfet is better suited ...
>
> hmm, mosfet doesn't make sense t
At Thu, 3 May 2001 22:36:27 +0200 , Peter Bartosch <[EMAIL PROTECTED]> wrote:
>hmm, mosfet doesn't make sense to me - IIRC they only work like switches
A MOSFET is a type of field-effect transistor ... hence the "FET" part of the
name -- it can be sued for much more than a switch.
Get your ow
Hi!
> > at these extremes... the diodes wont helpand the dioes will simply
> > burn up due to the current it has to pass to get to that "voltage"
> > one side being a diode drop ( 0.7v ) across itself..
> > - a power mosfet is better suited ...
hmm, mosfet doesn't make sense to me - IIRC
On Wed, May 02, 2001 at 04:49:27PM -0700, Alvin Oga wrote:
> the diodes need to be power diodes... vs signal diodes
>
> given you cannot tie the power supplies at two diff voltages together...
> you have to isolate it somehow... ( the power diode method )
I'm a bit hazy on how this actually work
On Wed, May 02, 2001 at 11:21:49PM +0200, PiotR wrote:
> On Wed, May 02, 2001 at 08:30:10AM +1000, Hamish Moffatt wrote:
> > In power combining applications like these, balancing diodes
> > or resistors are usually used. It's not good just to connect
> > the outputs together.
>
> What's the differ
hi ya
> I think if you use a diode to connect the outputs you are limiting
> the current flow in one way only. And why would you want to do this?
the diodes need to be power diodes... vs signal diodes
given you cannot tie the power supplies at two diff voltages together...
you have to isolate
On Wed, May 02, 2001 at 11:21:49PM +0200, PiotR wrote:
> Also I didn't understood why Alvin said "If one PS dies you are dead" I
> believe it will only fail to power those drives attached to them.
This would only work in a raid >=1 setup. You'd have one one drive on PS1,
and its mirror on PS2
md
On Wed, May 02, 2001 at 04:52:03PM -0500, Nathan E Norman wrote:
> On Wed, May 02, 2001 at 11:21:49PM +0200, PiotR wrote:
> > I think if you use a diode to connect the outputs you are limiting the
> > current flow in one way only. And why would you want to do this?
>
> Could this topic die or go
(Sorry about the blank email... too much caffeene got me a twitchy
trigger finger).
Dimitri Maziuk wrote:
>
> In fact,
> there will be some point at which each individual PSU will run
> just as hot as if it handled all the load on its own (you can be sure
> your box will draw exactly that much lo
On Wed, May 02, 2001 at 11:21:49PM +0200, PiotR wrote:
> On Wed, May 02, 2001 at 08:30:10AM +1000, Hamish Moffatt wrote:
> > On Tue, May 01, 2001 at 08:42:04PM +0200, PiotR wrote:
> > > If you short circuit both PS's outputs then the voltage is the same and
> > > there won't be any reverse current
--
_
Rich Puhek
ETN Systems Inc.
2125 1st Ave East
Hibbing MN 55746
tel: 218.262.1130
email: [EMAIL PROTECTED]
___
On Wed, May 02, 2001 at 08:30:10AM +1000, Hamish Moffatt wrote:
> On Tue, May 01, 2001 at 08:42:04PM +0200, PiotR wrote:
> > If you short circuit both PS's outputs then the voltage is the same and
> > there won't be any reverse current, neither in the data cables. So te load
> > will be distribut
On Wed, May 02, 2001 at 03:13:34PM -0500, Rich Puhek wrote:
...
> I agree with Matthew in that there _is_ a reason to share the load,
> actually a few that I can think of. Let's say you have a pair of 300W
> supplies on a box that draws 250W at rest. Rather than let one supply
> crank along at 250W
On Wed, May 02, 2001 at 08:18:20PM +0100, Matthew Sackman wrote:
...
>
> Every production server that I've seen that has 2 PSUs has both
> continuously running. At hopefully < 50% capacity.
Interesting. Could you post the list of brand names/vendors so
that we'll know what not to buy.
... Of
>
Dell Poweredge 2450 style servers is what you're looking for. They have
two power supplies, each with its own power cord. Yes, it can run on one
PS... the last one I set up ran that way on my desk since I only had one
cord handy. Of course, you'll want to make damn sure the grounds are at
the same
On Fri, Apr 27, 2001 at 12:05:11PM -0500, Dimitri Maziuk wrote:
> On Thu, Apr 26, 2001 at 05:32:31PM -0700, Alvin Oga wrote:
> ...
> > - even if you had 2 power supplies...
> > - most motherboards only has one atx power connector
>
> True. And if you went for redundant PS's and a mobo that
>
Alvin.. have you really been following this thread at all?
On Tue, May 01, 2001 at 05:43:57PM -0700, Alvin Oga wrote:
> and if the power supply to the disk dies...
> than you're out of luck
> or if the powersupply tot eh motherboard dies...
> you'd be out of luck too
So what? It'
hi
yes gnd should be connected...
if +5v, +3.3v is NOT connected together...
and assuming you have 2 powersupplies..
and if the power supply to the disk dies...
than you're out of luck
or if the powersupply tot eh motherboard dies...
you'd be out of luck too
in which case.
On Tue, May 01, 2001 at 08:42:04PM +0200, PiotR wrote:
> If you short circuit both PS's outputs then the voltage is the same and there
> won't be any reverse current, neither in the data cables. So te load will be
> distributed between both PS.
In power combining applications like these, balanc
On Tue, May 01, 2001 at 07:46:42PM +1000, Hamish Moffatt wrote:
> On Tue, May 01, 2001 at 11:03:06AM +0200, Russell Coker wrote:
> > On Monday 30 April 2001 00:04, Hamish Moffatt wrote:
> > > I don't see why. Nor is this any different to any external drives.
> > > You have a hefty ground connection
On Tue, May 01, 2001 at 11:03:06AM +0200, Russell Coker wrote:
> On Monday 30 April 2001 16:11, PiotR wrote:
> > A good solution for this might be to connect the first PS's output to the
> > other, so the voltage is the same, and there's no massive current flow
> > across the data cables.
>
> That
> Sorry I missed the start of the thread. I would suggest you to buy a simple
> IDE-to-SCSI Raid Appliance. You don't have the trouble with sizing the Power
> supply. You get a neat chasis with plug-able disks and you also get the
> speed of SCSI and the ability to plug it into every server you de
On Tue, May 01, 2001 at 11:03:06AM +0200, Russell Coker wrote:
> On Monday 30 April 2001 00:04, Hamish Moffatt wrote:
> > I don't see why. Nor is this any different to any external drives.
> > You have a hefty ground connection between the power supplies anyway
> > (the mains, plus the metal case a
On Monday 30 April 2001 00:04, Hamish Moffatt wrote:
> On Sun, Apr 29, 2001 at 10:14:35AM +0200, Russell Coker wrote:
> > In a regular setup the IDE controller and the drive get power from the
> > same source. So if the signals on the cable have more current going one
> > way than the other then t
On Sun, Apr 29, 2001 at 10:14:35AM +0200, Russell Coker wrote:
> On Sunday 29 April 2001 06:48, Brandon High wrote:
> > On Sat, Apr 28, 2001 at 11:50:26PM +0200, Andreas Bombe wrote:
> > > The IBM SCSI disk I have here has a jumper to delay spin up depending on
> > > SCSI ID so that an array of tho
On Sun, Apr 29, 2001 at 10:14:35AM +0200, Russell Coker wrote:
> On Sunday 29 April 2001 06:48, Brandon High wrote:
> > On Sat, Apr 28, 2001 at 11:50:26PM +0200, Andreas Bombe wrote:
> > > The IBM SCSI disk I have here has a jumper to delay spin up depending on
> > > SCSI ID so that an array of tho
On Sun, Apr 29, 2001 at 10:14:35AM +0200, Russell Coker wrote:
> In a regular setup the IDE controller and the drive get power from the same
> source. So if the signals on the cable have more current going one way than
> the other then the difference will be made up on the 0V line on the PSU. I
On Sat, Apr 28, 2001 at 11:50:26PM +0200, Andreas Bombe wrote:
> The IBM SCSI disk I have here has a jumper to delay spin up depending on
> SCSI ID so that an array of those would spin up sequentially if they all
> had those jumper set (and different IDs, which they need anyway).
Sorry I missed th
On Sunday 29 April 2001 06:48, Brandon High wrote:
> On Sat, Apr 28, 2001 at 11:50:26PM +0200, Andreas Bombe wrote:
> > The IBM SCSI disk I have here has a jumper to delay spin up depending on
> > SCSI ID so that an array of those would spin up sequentially if they all
> > had those jumper set (and
hi ya...
might be easier/cheaper to use a simple RC delay to deliver
power to the IDE disks before the motherboard actually gets
the "power up"
- remember that the atx powersupply has a "power-ok" signal
to tell the motherboard go ahead and power up...
( aka the powe
On Sat, Apr 28, 2001 at 11:50:26PM +0200, Andreas Bombe wrote:
> The IBM SCSI disk I have here has a jumper to delay spin up depending on
> SCSI ID so that an array of those would spin up sequentially if they all
> had those jumper set (and different IDs, which they need anyway). Maybe
> there are
On Fri, Apr 27, 2001 at 12:05:11PM -0500, Dimitri Maziuk wrote:
> I imagine the dangerous part would be when you turn the thing on
> and it tries to spin up all those disks. You could put them to sleep
> shortly after bootup and get the load down, but if PS doesn't blow on
> startup it probably
On Friday 27 April 2001 19:05, Dimitri Maziuk wrote:
> I imagine the dangerous part would be when you turn the thing on
> and it tries to spin up all those disks. You could put them to sleep
> shortly after bootup and get the load down, but if PS doesn't blow on
> startup it probably won't blow und
On Thu, Apr 26, 2001 at 05:32:31PM -0700, Alvin Oga wrote:
...
> - even if you had 2 power supplies...
> - most motherboards only has one atx power connector
True. And if you went for redundant PS's and a mobo that
supports them, the cost would go way up.
> - are the two power supplies pro
On Fri, Apr 27, 2001 at 12:49:13AM -0500, Rahul Jain wrote:
> On Thu, Apr 26, 2001 at 09:33:19PM -0700, Brandon High wrote:
> > On Thu, Apr 26, 2001 at 09:42:16PM -0400, [EMAIL PROTECTED] wrote:
> > > IDE causes a bit of a performance hit, I don't think we're talking high
> > > speed file access he
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