bad blocks... random death

From: Thierry ITTY (thierry.itty_at_besancon.org)
Date: 08/13/04

  • Next message: Crucificator: "Re: Keep losing RAID device" 
    Date: Fri, 13 Aug 2004 11:32:45
To: redhat-list@redhat.com

    this continues discussions about bad disk blocks not really bad and redhat
    9 dying randomly

    we're now a few on this list experiencing various symptoms (dma errors, bad
    blocks on disks, system freeze or death) that look like hardware problems.
    after talking togeteher we can now say that those problems are pure OS
    problems.

    the disks with bad blocks work actually fine elswhere (in my case I ran the
    manufacturer low-level diags and no disk had any problem. and, ain't it
    very strange that 10 disks get the same problems at the same time ?!!!)

    the problem happens on various machines (gigabyte, asus, athlon, pentium,
    maxtor, western...).

    it seems it is related to high load periods (in my case a heavily used file
    server).

    we've been advised to change dma disks settings. I tried various things (no
    dma at all, forcing mdma0 or udma2). the system behave differently (either
    no errors or other errors as dma timeouts), but it's not working quite well
    (for example deactivating dma on disks lowers the average network
    throughput from 50 MB/s to 1.5 !!! almost 40 times slower !!!

    we really need help to investigate this problem which causes io errors and
    fs corruption !

    tia 

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