Hello Bill ,
On Mon, 23 Jul 2007, Bill Davidsen wrote:
Mr. James W. Laferriere wrote:
Hello Andrew ,
On Tue, 17 Jul 2007, Andrew Burgess wrote:
The 'MCE's have been ongoing for sometime . I have replaced every
item
in the system except the chassis & scsi backplane & power
supply(750Watts) .
Everything . MB,cpu,memory,scsi controllers, ...
These MCE's only happen when I am trying to build or bonnie++ test
the
md3 . It consists of (now 7+1spare) 146GB drives in the SuperMicro
SYS-6035B-8B's backplane attached to a LSI22320 .
Probably every old timer has a story about chasing a hardware problem
where changing the power supply finally fixed it. I keep spares now.
If an MCE (which means bad cpu) doesn't go away after changing the cpu
it would either have to be temperature, power or a bug in the MCE code.
What else could it be?
Thank you for the idea of 'changing out the PS' . So I did it a bit
differant . I removed the system PS from the raid backplane & dropped in a
known good ps of proper wattage & re-tested . But left the systems ps
attached to only the MB & fans .
It doesn't appear to be power load related . I tried rebuilding my 7
disk raid6 array & I got the same thing , MCE .
Now the raid backplane is still in the air stream in front of the cpu's
and memory slots . So it could be a marginal cpu or memory stick .
But here's the clincher , when I don't use the two drives in from of
the PS & cpu & memory slots . The array completes it's resync . So I'm
back to testing memory (again) , If that passes then I'll try the new
cpu(s) route .
It does sound like a cooling problem, which does not have to imply the
overheated parts are bad, although that may be true.
Fyi , memtest86+ @ 19 passes (~ 52hours) on 8GB of memory , no errors .
Could be the total number of i/o in flight, etc.
Hmmm , I didn't think of this one .
Have you tried dropping two other drives?
Well , no . I dropped those two in front of the CPU as a test in
working my way up the scsi backplane(BP) trying to find a point that worked &
the last two drives in the BP just happened to be in front of the cpu/memory
air path . The minute I put those in the MD build tree within the usual time
frame I get a MCE . What I have'nt tried is what you are probably suggesting
make sure it is the drives in the air path by putting them in the MD build and
leaving another two out . I'll try that as well .
Can you put in a bit more fan?
Nope , It's maxed out . sounds like a 747 on take off as it is .
It's a supermicro SYS-6035B-8B if you have the time to go look at the
specs & pics .
Read the system board and CPU temps with the "sensors" package?
Not yet , I am building the need items into the kernel now .
Will report back (hopefully) sometime this weekend .
Tia , JimL
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| James W. Laferriere | System Techniques | Give me VMS |
| Network Engineer | 663 Beaumont Blvd | Give me Linux |
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