Kernel freeze next steps

[Timothy M. Spear]

Hi,
    My desktop machine will periodically freeze completely. It will not 
respond to mouse, keyboard, network pings, ssh or any other service. I 
have tried the usual items to eliminate the problem:
    1. memtest 86+ no errors
    2. turn off ACPI, APM, and AMD PowerNow
    3. checked messages, syslog, kern.log, dmesg for errors. I did not 
find any.
    4. Leave the machine in console mode and wait for a lock. No errors 
displayed.
    5. Rebuild system in case of corruption
    6. Check system freeze with Live CD. Does not (which leads me to 
suspect disk I/O is the problem).
    7. Check hardware in other machines, tested everything but CPUs and 
Motherboards in other computers. No problems.
    8. BIOS Patches. All updated.

    One other symptom, which may or may not be related, is very slow I/O 
performance.

    Basic system information:
    -- Gutsy Gibbon AMD64, fully patched.
    -- Dual Opteron 246 processors
    -- 4 GB of Ram
    -- 8 SATA Drives. 4 attached on the Motherboard, 4 attached to a 
Promise card. Both use the SiI 3114 Chipset.

    Any ideas on what next to try to debug this would be appreciated.

Thanks,

Tim

-- 
Timothy M. Spear
COO
Tangible Software, Inc.
6701 Democracy Blvd. Suite 300
Bethesda, MD 20817
eMail: tspear at tangiblesoftware.com
Office: 800-913-9901 x1002
Cell: (703) 855-1845