6.0-BETA1: ATA RAID rebuild not working

From: Frode Nordahl (frode_at_nordahl.net)
Date: 07/25/05

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    To: freebsd-current@freebsd.org
Date: Mon, 25 Jul 2005 21:19:55 +0200

    Hello,

    I am having trouble rebuilding my ATA / SATA RAIDs with 6.0-BETA1.

    I have tried it on:
         Intel SCB2 with onboard Promise PDC20267 UDMA100 controller
         Intel 875WP3 with onboard ICH5 SATA150 controller
             (Using PseudoRAID, not Intel MatrixRAID...)

    # atacontrol status ar0
    ar0: ATA RAID1 subdisks: DOWN ad6 status: DEGRADED

    # atacontrol addspare ar0 ad4
    ad4: inserted into ar0 disk0 as spare

    # atacontrol rebuild ar0

    # atacontrol status ar0
    ar0: ATA RAID1 subdisks: ad4 ad6 status: REBUILDING 0% completed

    And then it just sits at 0% forever. I started a rebuild process on
    the Promise this friday, and it is still at 0%.

    During my testing I noticed that when running atacontrol rebuild, a
    dd process shows up. What is it for?

    root 546 0.0 0.3 3240 2760 p0- DNL Fri01PM 0:00.01 /bin/dd
    if=/dev/ar0 of=/dev/null bs=1m

    (note, it has run since friday)

    Tracing this process show the following:
    sched_switch(c3885300,0,1) at sched_switch+0x177
    mi_switch(1,0) at mi_switch+0x270
    sleepq_switch(d7540f08,ececabc4,c0637469,d7540f08,0) at sleepq_switch
    +0xe0
    sleepq_wait(d7540f08,0,0,c085c10e,e52) at sleepq_wait+0x30
    bwait(d7540f08,4c,c085429d) at bwait+0x47
    physio(c381be00,ececacbc,0,100000,c381be00) at physio+0x1db
    devfs_read_f(c3859000,ececacbc,c3ae7780,0,c3885300) at devfs_read_f+0x87
    dofileread(c3885300,4,c3859000,ececacbc,ffffffff) at dofileread+0x85
    kern_readv(c3885300,4,ececacbc,804f000,100000) at kern_readv+0x36
    read(c3885300,ececad04,3,1,246) at read+0x45
    syscall(3b,3b,3b,2104,bfbfed40) at syscall+0x22f
    Xint0x80_syscall() at Xint0x80_syscall+0x1f
    --- syscall (3, FreeBSD ELF32, read), eip = 0x280b9727, esp =
    0xbfbfec8c, ebp = 0xbfbfecd8 ---

    db> show locks
    exclusive sleep mutex Giant r = 0 (0xc091dba0) locked @ /usr/src/sys/
    kern/kern_intr.c:544

    Frode Nordahl
    frode@nordahl.net

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