RAID1 Corruption

From: Tony Mantler (nicoya_at_ubb.ca)
Date: 07/30/04

  • Next message: Jeff Woods: "Re: OK, anybody have any hints and tips to get an MFM drive working again?" 
    To: linux-kernel@vger.kernel.org
Date:	Fri, 30 Jul 2004 10:44:53 -0500

    Ok, here's the deal. My friend has a Dual-CPU PowerMac 9600, and it's
    randomly corrupting it's filesystem. Kernel is 2.6.5, unpatched.

    Currently it's set up as thus:

    IDE Harddrives -> MD RAID1 -> LVM -> XFS

    Everything works fine with only one drive in the RAID1 (not that it's
    much of a RAID1 that way). Add in a second drive (100% clean), sync it
    up, and it eats the filesystem.

    I'm really quite baffled as to why this is happening, and my friend is
    getting understandably frustrated.

    # uname -a
    Linux egunn 2.6.5 #4 SMP Thu Jun 24 22:15:21 CDT 2004 ppc GNU/Linux

    # cat /proc/ide/pdc202xx

                                     Ultra66 Chipset.
    ------------------------------- General Status
    ---------------------------------
    Burst Mode : enabled
    Host Mode : Tri-Stated
    Bus Clocking : 100 External
    IO pad select : 10 mA
    Status Polling Period : 15
    Interrupt Check Status Polling Delay : 15
    --------------- Primary Channel ---------------- Secondary Channel
    -------------
                     disabled disabled
    66 Clocking enabled enabled
                Mode MASTER Mode MASTER
                     Error Error
    --------------- drive0 --------- drive1 -------- drive0 ----------
    drive1 ------
    DMA enabled: yes yes yes yes
    DMA Mode: UDMA 4 NOTSET UDMA 4
    NOTSET
    PIO Mode: PIO 4 NOTSET PIO 4
    NOTSET

    # cat /proc/mdstat
    Personalities : [linear] [raid0] [raid1] [raid5]
    md0 : active raid1 hde[0] hdg[1]
           40146560 blocks [2/2] [UU]

    unused devices: <none>

    # pvdisplay
       --- Physical volume ---
       PV Name /dev/md0
       VG Name raid40gs
       PV Size 38.29 GB / not usable 0
       Allocatable yes (but full)
       PE Size (KByte) 4096
       Total PE 9801
       Free PE 0
       Allocated PE 9801
       PV UUID lKMk7i-S9Ex-OWsl-tp1Y-ujvy-GrgS-sINUpT
    # vgdisplay
       --- Volume group ---
       VG Name raid40gs
       System ID
       Format lvm2
       Metadata Areas 1
       Metadata Sequence No 4
       VG Access read/write
       VG Status resizable
       MAX LV 0
       Cur LV 3
       Open LV 3
       Max PV 0
       Cur PV 1
       Act PV 1
       VG Size 38.29 GB
       PE Size 4.00 MB
       Total PE 9801
       Alloc PE / Size 9801 / 38.29 GB
       Free PE / Size 0 / 0
       VG UUID 96IWfR-zm53-3qD8-ZilV-9zW6-VG87-36QqDI

    # lvdisplay
       --- Logical volume ---
       LV Name /dev/raid40gs/var
       VG Name raid40gs
       LV UUID jgdM0R-fp4I-LgAl-s1vI-63i0-WHX6-OfnU69
       LV Write Access read/write
       LV Status available
       # open 1
       LV Size 4.88 GB
       Current LE 1250
       Segments 1
       Allocation inherit
       Read ahead sectors 0
       Block device 253:0

       --- Logical volume ---
       LV Name /dev/raid40gs/usr
       VG Name raid40gs
       LV UUID hWtNL5-gfaq-jwj4-R6XD-Sew2-TKCy-fxLKrW
       LV Write Access read/write
       LV Status available
       # open 1
       LV Size 4.88 GB
       Current LE 1250
       Segments 1
       Allocation inherit
       Read ahead sectors 0
       Block device 253:1

       --- Logical volume ---
       LV Name /dev/raid40gs/home
       VG Name raid40gs
       LV UUID myekKQ-eXR7-0dGV-ZMg6-ISPG-Hijh-ZmDA5V
       LV Write Access read/write
       LV Status available
       # open 1
       LV Size 28.52 GB
       Current LE 7301
       Segments 1
       Allocation inherit
       Read ahead sectors 0
       Block device 253:2 

    --
Tony 'Nicoya' Mantler -- Master of Code-fu -- nicoya@ubb.ca
--  http://nicoya.feline.pp.se/  --  http://www.ubb.ca/  --
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