RAID1 Corruption

[Tony Mantler]

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@xxxxxx
--  http://nicoya.feline.pp.se/  --  http://www.ubb.ca/  --

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