Re: raid5:md3: read error corrected , followed by , Machine CheckException: .

From: Mr. James W. Laferriere
Date: Sat Jul 14 2007 - 22:32:53 EST

Hello Alan (& Justin) ,

On Sun, 15 Jul 2007, Alan Cox wrote:
On Sat, 14 Jul 2007 17:08:27 -0700 (PDT)
"Mr. James W. Laferriere" <babydr@xxxxxxxxxxxxxxxx> wrote:

Hello All , I was under the impression that a 'machine check' would be
caused by some near to the CPU hardware failure , Not a bad disk ?

It indicates a hardware failure

OK , Be funny :-} . Tho it ain't . I still think I am correct in stating that a "'machine check' would be caused by some near to the CPU hardware failure" . Ie: like physically shoved into the motherboard . Not a indirectly connected device . Such as a disk drive .


Jul 14 23:00:26 filesrv2 kernel: sd 2:0:1:0: SCSI error: return code = 0x08000002
Jul 14 23:00:26 filesrv2 kernel: sdd: Current: sense key: Medium Error
Jul 14 23:00:26 filesrv2 kernel: Additional sense: Read retries exhausted

So your disk throws a fit

Actually it's brand new . Infant mortallity ? I at least have a cold spare available . So Yes I am replacing that puppy . I'll drop it into another system & give it the format command & see how much the user bad block table grows . I'll bet I'll get a table full overflow on it .


Jul 14 23:17:06 filesrv2 kernel: raid5:md3: read error corrected (8 sectors at 72269184 on sdd)
Jul 14 23:17:06 filesrv2 kernel: raid5:md3: read error corrected (8 sectors at 72269192 on sdd)

Raid happily recovers the mess

That they did . scsi & raid .


Jul 14 23:20:28 filesrv2 kernel: raid5:md3: read error corrected (8 sectors at 76388336 on sdd)
Jul 14 23:20:28 filesrv2 kernel: raid5:md3: read error corrected (8 sectors at 76388344 on sdd)
Jul 14 23:38:48 filesrv2 -- MARK --
CPU 5: Machine Check Exception: 0000000000000004
CPU 4: Machine Check Exception: 0000000000000004

And at some point at least 18 minutes after the raid incident you log
CPU problems.

I didn't notice the 18 Minute differance . Drats .
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 .

Are you sure the box or the room it is in didn't get excessively hot ?

The room before and at the time of the MCE was never over 71F . Now the memory temp might be a tad hot but I've got a small jet engine running in that chassis as noisy as it is with fans so I don't see how anything in there could be too hot .
Temp this time , 71.2F . everytime I try that array it MCE's .
I have another array in a JBOD box of 14 disks & I have no problems with this system as long as I disconnect all the drives in the 8 drive Backplane .
I guess I'll just have to do without the extra 143,564,800K of data space .
Twyl , JimL

ps: system face diagram ...
+-------------------------+
|0|1|2|3|4|6|7|-----------| +-| | | | | | | |-----------|
| | | | | | | | |-----------|
| +-------------------------+
| \ /
| +---md3---+
|
| +-------------------------+
| |0|1|2|3|4|6|0|1|2|3|4|5|6|
+-| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
+-------------------------+
\ /\ /
+---md4---+ +---md4--+
--
+-----------------------------------------------------------------+
| James W. Laferriere | System Techniques | Give me VMS |
| Network Engineer | 663 Beaumont Blvd | Give me Linux |
| babydr@xxxxxxxxxxxxxxxx | Pacifica, CA. 94044 | only on AXP |
+-----------------------------------------------------------------+
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