[Bug 625097] [NEW] Linux kernel not recognizing version 1.0 raid superblocks

[Quinn Plattel]

Public bug reported:

Hi,

The linux kernel seems to only recognize version 0.90 raid superblocks.
If the superblocks are version 1.0, the kernel cannot mount the raid
array.  Steps to reproduce:

mdadm --misc --zero-superblock /dev/sdb # remove previous superblocks
mdadm --misc --zero-superblock /dev/sdb # remove previous superblocks
dd if=/dev/zero of=/dev/sdb bs=1M count=10 # zero out old data
dd if=/dev/zero of=/dev/sdc bs=1M count=10 # zero out old data
# create a type 0xfd primary partition on both /dev/sdb and /dev/sdc devices
mdadm --create -l1 -n2 -e 1.0 /dev/md0 /dev/sdb1 /dev/sdc1
mdadm -S /dev/md0
mdadm --auto-detect # this fails if the superblock is not 0.90.

A workaround is to use "mdadm --assemble --scan"

The reason for creating version 1.0 superblocks is that disks are
approaching the 2TB limit for a 0.90 superblock.  After 2TB a
1.0/1.1/1.2 superblock must be used.

br,
Quinn

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-24-generic 2.6.32-24.41
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-24.41-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  user       2022 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xf9ff4000 irq 16'
   Mixer name	: 'Realtek ALC883'
   Components	: 'HDA:10ec0883,1043829e,00100002'
   Controls      : 35
   Simple ctrls  : 20
Date: Fri Aug 27 06:54:19 2010
MachineType: System manufacturer System Product Name
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=faab3ad1-f122-474a-aeb8-81af4cccdc37 ro quiet splash
ProcEnviron:
 PATH=(custom, username)
 LANG=en_DK.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34.1
RfKill:
 0: hci0: Bluetooth
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
dmi.bios.date: 04/21/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1104
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M3A
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1104:bd04/21/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM3A:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kconfig lucid needs-upstream-testing regression-release

-- 
Linux kernel not recognizing version 1.0 raid superblocks
https://bugs.launchpad.net/bugs/625097
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