Bill Davidsen wrote:

John McMonagle wrote:

quoted

Have a raid1  backup server that seems to get corrupted.
This is the 3rd time in about a year.
Have 2 other backup servers that were cloned from this one that have
no problems.

Done a couple kernel upgrades recently.
Now has 2.6.18-2 kernel.
It's based on Debian sarge.

It's a low end Intel server motherboard using ata_piix sata driver.
Have another mother board just like doing raid1 with sata drives that
has had no problems but it has a much lighter disk load.
smartctl has never shown any problems.
In /sys/block/md2 did
echo check > syncaction
No error messages but mismatch_cnt  is 1152.
rc0/errors and rc1/errors are both 0.

I'm guessing a hardware problem.
Any suggestions? 

Since memory is the easiest to test, I'd try memtest86+ for at least
12 hr. If this were PATA I'd suggest replugging the cables, but it's
lower probability with SATA. Still, probably worth trying.

Ran  Memtest86+ for over 18 hours with no errors.
Also have ecc ram.
I can look at the cables next time I'm  there.
Doesn't  sata do some sort of error checking over the cables?
Anything else to try?


Memtest86+ v1.65      | Pass 74% ############################
Pentium 4 (0.09) 2793 MHz   | Test 61% #######################
L1 Cache:   16K 17135MB/s   | Test #7  [Random number sequence]
L2 Cache: 1024K 15179MB/s   | Testing:  112K - 1024M 1024M
Memory  : 1024M  2059MB/s   | Pattern:   189170f4
Chipset : Intel i875P (ECC : Detect / Correct) - PAT : Enabled
Settings: RAM : 199 MHz (DDR398) / CAS : 3-3-3-8 / Dual Channel (128 bits)

 WallTime   Cached  RsvdMem   MemMap   Cache  ECC  Test  Pass  Errors
ECC Errs
 ---------  ------  -------  --------  -----  ---  ----  ----  ------
--------
  18:52:27   1024M     120K  e820-Std    on   off   Std    56       0
 -----------------------------------------------------------------------------

-- 
John McMonagle
IT Manager
Advocap Inc.