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    SubjectRe: RAID extremely slow
    Kevin Ross wrote:
    >
    >>>
    >>>> unused devices:<none>
    >>>>
    >>>> # cat /proc/sys/dev/raid/speed_limit_min
    >>>> 10000
    >>> MD is unable to reach its minimum rebuild rate while other system
    >>> activity is ongoing. You might want to lower this number to see if that
    >>> gets you out of the stalls.
    >>>
    >>> Or temporarily shut down mythtv.
    >>
    >> I will try lowering those numbers next time this happens, which will probably
    >> be within the next day or two. That's about how often this happens.
    >
    > Unfortunately, it has happened again, with speeds at near zero.
    >
    > # cat /proc/mdstat
    > Personalities : [raid6] [raid5] [raid4]
    > md0 : active raid6 sdh1[0] sdd1[9] sde1[10] sdb1[6] sdi1[7] sdc1[4] sdf1[3]
    > sdg1[8] sdj1[1]
    > 6837311488 blocks super 1.2 level 6, 512k chunk, algorithm 2 [9/9]
    > [UUUUUUUUU]
    > [=>...................] resync = 8.3% (81251712/976758784)
    > finish=1057826.4min speed=14K/sec
    >
    > unused devices: <none>
    >
    > atop doesn't show ANY activity on the raid device or the individual drives.
    > http://img687.imageshack.us/img687/2913/screenshotfrom201207252.png
    >
    > Also, I tried writing to a test file with the following command, and it hangs.
    > I let it go for about 30 minutes, with no change.
    >
    > # dd if=/dev/zero of=test bs=1M count=1
    >
    > dmesg only reports hung tasks. It doesn't report any other problems. Here's my
    > dmesg output:
    > http://pastebin.ca/2174778
    >
    > I'm going to try rebooting into single user mode, and see if the rebuild
    > succeeds without stalling.
    >
    Have you set the io scheduler to deadline on all members of the array? That's
    kind of "job one" on older kernels.

    --
    Bill Davidsen <davidsen@tmr.com>
    "We have more to fear from the bungling of the incompetent than from
    the machinations of the wicked." - from Slashdot




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