[Sunhelp] Problem with E220 "redundant" power supplies

[Hal Flynn]

The thing that makes me curious is if the E420R's are the same way.  I just
recently turned up a cluster of 10 of them at a site.  Nice boxes.  Basically a
E450 without the storage bay.  Ran them to MTI arrays via fiber channel.  Very,
very nice.

Tony Alberti wrote:

> I have forwarded this email over to John Donnat at Sun (the FE who
> explained the power supplies to me).  I'm waiting for his reply.
> Your prtdiag negates what I was told, now I would like to hear the
> truth.  Sorry for any misinformation. I will pass along Sun's reply
> as soon as I get it.
>
> Confused,
>     Tony
>
> ----- Original Message -----
> From: "James Lockwood" <james at foonly.com>
> To: <sunhelp at sunhelp.org>
> Sent: Thursday, June 22, 2000 12:43 AM
> Subject: Re: [Sunhelp] Problem with E220 "redundant" power supplies
>
> > On Wed, 21 Jun 2000, Tony Alberti wrote:
> >
> > > I have had a similar situation on an E250.
> > > I asked one of the Sun FE's here in Chicago
> > > to explain this.  I was told that the dual power
> > > supplies in a 250 aren't truely redundant when
> > > the machine is loaded. If you have two power
> >
> > This is wrong.  Dual powersupplies in a 450 are not redundant in a maximal
> > configuration, but they are sufficient for a 250.
> >
> > > supplies and only 1 internal disk, there is enough
> > > power in one power supply to handle the load,
> > > so the redundancy works.   However when you
> > > have all 6 HDs in a 250, that second power supply
> > > uses about 75% of its output to drive the disk
> > > backplane.   It is no longer redundant.
> > > If the machine had truely redundant power
> > > supplies, one could handle the load of the
> > > system AND all 6 disks, so all you would
> > > need for operation was 1, and the second
> > > for redundancy.   Try to order an E250
> > > from Sun configured for 6 internal disks
> > > and 1 powersupply.  They will NOT
> > > sell you that configuration.  If you
> >
> > This is incorrect.  I have 4 E250's with 6x18GB, 1GB RAM and dual 400MHz
> > CPU's.  All were ordered in this configuration and came from Sun with one
> > powersupply, with which they work fine.  The E250 is fully redundant with
> > two powersupplies in all configurations.  Consult the h/w answerbook for
> > power capacity planning information.
> >
> > koffing:/usr/platform/sun4u/sbin% ./prtdiag -v
> > System Configuration:  Sun Microsystems  sun4u Sun (TM) Enterprise 250 (2
> > X UltraSPARC-II 400MHz)
> > System clock frequency: 100 MHz
> > Memory size: 1024 Megabytes
> >
> > ========================= CPUs =========================
> >
> >                     Run   Ecache   CPU    CPU
> > Brd  CPU   Module   MHz     MB    Impl.   Mask
> > ---  ---  -------  -----  ------  ------  ----
> > SYS     0     0      400     2.0   US-II    10.0
> > SYS     1     1      400     2.0   US-II    10.0
> >
> > ...
> >
> > Disk LED Status:        OK = GREEN      ERROR = YELLOW
> >                 DISK  5:    [OK]        DISK  3:    [OK]        DISK  1:
> > [OK]
> >                 DISK  4:    [OK]        DISK  2:    [OK]        DISK  0:
> > [OK]
> >
> > ...
> >
> > Power Supplies:
> > ---------------
> >
> > Supply     Status
> > ------     ------
> >   0          OK
> >
> > > want 2 internal disks and 1 power supply,
> > > they will sell that to you (assuming the mainboard
> > > had the same loaded config of 2 400mHz CPUS and
> > > 2 gig memory in both configurations).
> > > I suspect something similar probably occured in your 220.
> > > Although there are less internal disks in a 220, perhaps the
> > > power supplies are less as well.
> >
> > The 220 routes power from the sockets on the back differently.  Check the
> > E220 h/w answerbooks for details.
> >
> > -James
> >
> >
> > _______________________________________________
> > SunHELP maillist  -  SunHELP at sunhelp.org
> > http://www.sunhelp.org/mailman/listinfo/sunhelp
>
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