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    SubjectRe: Strange DMA-errors and system hang with Promise 20268
    On Sat, 2004-05-29 at 16:42, Mario 'BitKoenig' Holbe wrote:
    > Hi,
    > On Sun, Mar 07, 2004 at 02:05:46AM +0100, Mario 'BitKoenig' Holbe wrote:
    > > Mar 4 01:01:06 darkside kernel: hde: dma_timer_expiry: dma status == 0x21
    > hmmm, it seems I solved the issue in my case.
    > I did just connect the two disks on the Promise to a second separate
    > power supply and everything works rock-stable and survives all things
    > that went wrong before (parallel fsck, parallel hdparm -t as well as
    > 'normal operation' over days).
    > Things remain stable even with the WDC disk connected back to the
    > Promise, which was heavy unstable before.
    > Moreover, when I connect the disks back to the machines internal power
    > supply, the problems arise again - immediately.
    > IMHO, this does also explain, why the problems happen while heavy I/O
    > (parallel over all disks) and/or while S.M.A.R.T selftests are running
    > (also: parallel over all disks).
    > Well, I thought, a 300W power supply would be enough for 1GHz P-III
    > and 4 disks. And it definitely was enough for a long time.
    > Most likely, the power supply just aged and its capacity decreased.
    > Perhaps, the disks consume more power with newer kernels, but while
    > crawling the lkm archives I found similar reports also for 2.4.19.
    > I have no idea, why always the disks connected to the Promise
    > controller did fail. Perhaps, the Promise is more sensitive regarding
    > signal quality on the IDE wire.
    > I have no idea, why my WDC disk failed when connected to the Promise,
    > while others did work far more stable. Perhaps, the WDC disks signal
    > quality under low-power is more bad than the one of other disks.
    > I have no idea, why the WDC disk did work well when it was connected
    > to the onboard controller. Perhaps, the lower signal quality of the
    > WDC (if so) and the sensitivity of the Promise (if so) added together
    > was too much at all.
    > Henrik, Sebastian: if you still have problems, this is probably
    > something to test for you.

    Well. I don't have those problems anymore but..I have a question..
    Should the box freeze just because there is some powerfailures? :/

    Henrik Persson <>

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