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 read
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 connection
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 difference
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 works,
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 they
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 own
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 they
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
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 the list
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
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's
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
supports
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 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
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 08:30:10AM +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 distributed
--
_
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 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,
(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 load,
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
md0=
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
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 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 those would
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 the
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 acting
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
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's if
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 between
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,
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
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 those would
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
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 power
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
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 the
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. If
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 under
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 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 here
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
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