[j-nsp] M10 routing engine memory upgrade

Eric Van Tol eric at atlantech.net
Fri Feb 25 15:41:14 EST 2005

Our M5s, prior to upgrading RAM, were Non-ECC.  After the RAM upgrades,
they were ECC.  This is using Juniper memory.  Sample from config diffs:

 # router> show chassis routing-engine
 # Routing Engine status:
-#     DRAM                       256 MB
+#     DRAM                       768 MB
 #     Serial ID                      e3000000ba492b01
 # router> show chassis scb
@@ -91,7 +91,7 @@
 # DEVFS: ready for devices
 # Pentium Pro MTRR support enabled
 # md0: Malloc disk
-# DRAM Data Integrity Mode: Non-ECC
+# DRAM Data Integrity Mode: ECC Mode with h/w scrubbing
 # npx0: <math processor> on motherboard
 # npx0: INT 16 interface
 # pcib0: <Intel 82443BX host to PCI bridge (AGP disabled)> on


-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Richard A
Sent: Friday, February 25, 2005 3:23 PM
To: Pedro Roque Marques
Cc: John Kristoff; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] M10 routing engine memory upgrade

On Fri, Feb 25, 2005 at 12:08:49PM -0800, Pedro Roque Marques wrote:
> Brian W Gemberling writes:
> > John,
> >  	Those should work just fine.  They work for me.
> Just make really sure that when the box boots up you see a line
>   "DRAM Data Integrity Mode: ECC Mode with h/w scrubbing"
> non-ECC memory will cause your system to crash due to memory
> corruption. It is only a question of time... for a system that is on
> 24x7 the interval of time for the propabability to be close to 1 is
> not that high.
> We do see that kind of problems in practice.

Interestingly, I've run across a pile of M5s with RE-333's shipped
that don't have ECC (or at least the kernel doesnt detect it). I wasn't 
able to find any feedback from anyone who had seen Juniper shipping 
non-ECC, but I've now seen about 5 of these, so I'm really starting to 
wonder. :)

Richard A Steenbergen <ras at e-gerbil.net>
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1
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