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    SubjectRe: Lots of con-current I/O = resets SATA link? (2.6.25.10)


    On Tue, 8 Jul 2008, Gerhard Wiesinger wrote:

    > On Mon, 7 Jul 2008, Justin Piszcz wrote:
    >
    >> Hi Gerhard,
    >>
    >> It /could/ be the port itself if you have changed the cable and disk..
    >>
    >
    > Yes, but it is very unlikely. I have written TB of data there without any
    > problems. Anyway this is my 3rd exchanged SAMSUNG disk ...
    >
    >
    >> Have you tried loading the disk with dd and seeing if you can reproduce the
    >> problem? You are getting the same error I get generally, I can recommend
    >> turning OFF NCQ first and see if the problem goes away.
    >>
    >> # Define DISKS.
    >> cd /sys/block
    >> DISKS=$(/bin/ls -1d sd[a-z])
    >>
    >> # Disable NCQ on all disks.
    >> echo "Disabling NCQ on all disks..."
    >> for i in $DISKS
    >> do
    >> echo "Disabling NCQ on $i"
    >> echo 1 > /sys/block/"$i"/device/queue_depth
    >> done
    >>
    >
    > I tried to disable NCQ on all disks and tried to rebuild the raid, but it
    > still failed to rebuild with the same error message.
    >
    > I also tried the nolapic kernel parameter without success.
    >
    > /dev/sda: 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
    > Always - 0
    > /dev/sdb: 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
    > Always - 0
    > /dev/sdc: 5 Reallocated_Sector_Ct 0x0033 091 091 010 Pre-fail
    > Always - 413
    > /dev/sdd: 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
    > Always - 0
    > /dev/sde: 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
    > Always - 0
    > /dev/sdf: 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
    > Always - 0
    >
    > The only thing is that the Reallocated_Sector_Ct is still >0 on /dev/sdc
    > (keep in mind this is my 3rd new Samsung disk on /dev/sdc and I had up to
    > 3000 Reallocated_Sector_Ct on previous disks in < 1 day !!!).
    >
    > Should I replace the disk a fourth time?
    >
    > When you search in google you find a lot of threads with the timeout problem.
    > Might this be a software issue?
    >
    > Any ideas?

    Please run:

    smartctl -t short /dev/sdc
    sleep 300
    smartctl -t long /dev/sdc

    Wait 2-3 hours or more and:

    smartctl -a /dev/sdc

    Justin.


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