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    SubjectRe: RAID 10 w AHCI w NCQ = Spurius I/O error
    Date
    Nestor A. Diaz wrote:
    > Hello People,
    >
    > I need your help, this problem is turning me crazy.

    Did you know there is a raid list?
    >
    > I have created a RAID 10 using a RAID0 configuration on top of a two
    > RAID1 devices (all software raid), like this:

    You have created a raid 0+1, raid10 is a different thing. Given your
    setup, raid10 is probably what you *should* have created.
    >
    > Personalities : [raid0] [raid1]
    > md4 : active raid0 md2[0] md3[1]
    > 605071872 blocks 64k chunks
    >
    > md0 : active raid1 sdd3[3] sda3[0] sdc3[2] sdb3[1]
    > 9791552 blocks [4/4] [UUUU]
    >
    > md3 : active raid1 sdd2[2](F) sdb2[0]
    > 302536000 blocks [2/1] [U_]
    >
    > md1 : active raid1 sdd1[3] sda1[0] sdc1[2] sdb1[1]
    > 240832 blocks [4/4] [UUUU]
    >
    > md2 : active raid1 sda2[0] sdc2[1]
    > 302536000 blocks [2/2] [UU]
    >
    > unused devices: <none>
    >
    > But the sdd device sometimes fail, i have changed the hard disk, check
    > the older sata drive, reformat using mke2fs -c -c (to check for media
    > errrors both read and write, no media problems found, change the sata
    > disk and the problem remains, also with a new sata hard disk).
    >
    > The systema is a supermicro server 5015-mt+ with an ich7 ahci controller

    [___snip___]
    >
    > The RAID 1 builds perfectly, but five days after that, the system shows a:
    >
    > end_request: I/O error, dev sdd, sector 144006110
    > raid1: Disk failure on sdd2, disabling device.
    > Operation continuing on 1 devices
    > end_request: I/O error, dev sdd, sector 144006222
    > end_request: I/O error, dev sdd, sector 144268814
    > RAID1 conf printout:
    > --- wd:1 rd:2
    > disk 0, wo:0, o:1, dev:sdb2
    > disk 1, wo:1, o:0, dev:sdd2
    > RAID1 conf printout:
    > --- wd:1 rd:2
    > disk 0, wo:0, o:1, dev:sdb2

    Hardware error, almost certainly. If you're using a hub, I suspect that
    first, then cables and heat problems, then the controller, in rough
    order of likelyhood.
    >
    > a week before i get (under 2.6.18) the following message:
    >
    [___lots more snip___]

    >
    > I have updated from 2.6.18 to 2.6.22 expecting to not have the problem,
    > but the problem remains and i didn't know what could be the problem, the
    > problem always happen on /dev/sdd, i use LVM on top of the RAID 10
    > software device.
    >
    > I am not sure if the problem was because i create the RAID10 using two
    > RAID1 devices and then do a RAID0, or should i have to be used mdadm and
    > the level 10 option ?
    >
    > Any suggestions will be welcome.
    >
    Do you ever get errors in partitions which are not part of the raid0+1
    setup, like md1? If not, look at your partition tables to see if you
    have any strange values there.

    Are all drives at the same firmware level?

    --
    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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