Re: [mythtv-users] AM2+ motherboard with support for ECC RAM for media player / server
Roger Heflin wrote:
Actually the errors don't happen that often anymore, not sure exactly why, but I
have monitored huge amounts of ram (10000+ GB for months) and the errors happen
pretty rarely except on machines getting huge numbers of errors, in a given
month with a machine with 32GB on it very few of the machines get any errors at
all, the few that get errors don't usually get only 1 error.
Bill Williamson wrote:
On Wed, May 7, 2008 at 4:23 PM, Bob <email@example.com
ECC RAM corrects bit errors in memory which could cause a crash or other
problems, these errors while rare are estimated to occur once a month
per GB of RAM, I'm planing have 2 or 4 GBs and I'll leave the system up
all the time, which is why reliability and low power consumption are a must.
> Unbuffered / Registered obviously.
Bad form Bla Bla Bla but just to update the list, the abit A-S78H also
supports Un-buffered ECC RAM, it doesn't have FireWire though
Why do you think that ECC vs non ECC ram will have any bearing on
stability of a media computer ? If you're going ECC, why would you
not also go SCSI?
I don't disagree with wanting stability, but the reality is that ECC
likely will not give you any.
That's interesting to have some real world figures, thank you.
But, if you are monitoring ECC then this will give you a chance to know about
the memory *BEFORE* it causes you machine to be unstable and crash randomly
without you knowing why it is crashing. It would also speed up correcting the
issue as you don't have to guess what the actual issue is.
What do you use to monitor the errors?
On AMD boards a program called mcelog (you will have to put it in cron) will
work-most soft MCE errors are ECC errors either in the CPU or in memory, also
something in the kernel (may require an extra module in some distribtions)
called edac will also work. The edac thing will also work on *SELECT* intel
boards, mostly on the intel side only the higher end (dual socket server boards)
are supported, on AMD because the ECC is in the CPU itself it is pretty much
supported everywhere if the MB will take ECC ram.
It is really one of the advantages of the AMD cpus, as you can easily get ECC in
them without buying a single socket server grade MB for a lot more money that
you have to get with the Intel cpus.
This is exactly the reason I'm after an AM2+ MotherBoard that supports
it, I like these 2 boards  but I've had bad experiences with both
abit  and asus  in the past in both cases not actually their fault
but once bitten.. the only downside is the lack of FireWire which as Ron
on debian-users points out that can be fixed with a PCI card, the only
problem with that is these mATX are quite short on space and I'll
probably put a DVB-C card in.
In the order of the vendors, Supermicro's quality is on average better than any
of the other MB only vendors.
I don't want to build a "proper" server with ECC Registered RAM and SCSI
because it'll cost a fair bit more for a fairly marginal improvement in
stability and longevity.
SCSI does not matter anymore, in the last 3 years the SATA/IDE disk have got a
lot better, I think the issue is that the disk manufacturers figured out better
platter quality control. I have experience with large samples of SCSI
(2003-800 scsi disks) and SATA disks (2000+ IDE/SATA disks), and they both have
similar failures rates, if you go back to large numbers of IDE/SCSI disks in the
2000-2004 range this was not the case and the SATA disks were utter crap were
you could expect 10-20% failures in the first 6 months, and the SCSI/FC disks
had very low failure rates.
 abit BP6 motherboard dual skt 370 celeron board, that took ECC RAM,
great home SMP board with a clear upgrade path, only intel moved some
stuff around on the P!!! and shafted them / us
 some ASUS Slot A board with a crappy VIA chipset,  I won't touch
VIA again  and shouldn't really hold it against ASUS but I sort of have
I have a via chipset, and I have used other VIA MB's, and I would probably avoid
VIA if possible, but if they are the only ones with the required features I
would use them.