René Bleisch, thank you for reporting this and helping make Ubuntu
better. The next step would be to fully commit bisect from 2.6.32-33 to
2.6.32-38 in order to identify the offending commit. Could you please do
this following https://wiki.ubuntu.com/Kernel/KernelBisection ?
** Tags added: latest-bios-2.1c needs-bisect
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1247064
Title:
mdraid not assembled correctly when booting from kernel newer than
2.6.32-33
Status in “linux” package in Ubuntu:
Incomplete
Status in “mdadm” package in Ubuntu:
New
Bug description:
I operate a raid server consisting of two hardware RAID6 arrays (11 2 TB
disks each), which are combined in a MD-raid (Raid0).
When booting Kernel 2.6.32-33, the Raid is assembled correctly:
cat /proc/mdstat:
--------------------
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md0 : active raid0 sdb1[0] sdc1[1]
35156244352 blocks 64k chunks
unused devices: <none>
cat /proc/partitions:
------------------------
major minor #blocks name
8 0 244140288 sda
8 1 248832 sda1
8 2 1952768 sda2
8 3 241937408 sda3
8 16 17578123776 sdb
8 17 17578122240 sdb1
8 32 17578123776 sdc
8 33 17578122240 sdc1
9 0 35156244352 md0
When booting any newer kernel (eg. 2.6.32-38 or 2.6.32-52), the RAID is
assembled incorrectly, its size being far too low (8.5 TB instead of 35 TB). In
the following, the raid array is not usable.
cat /proc/mdstat:
---------------------
Personalities : [linear] [multipath] [raid0]
md0 : active raid0 sdb1[0] sdc1[1]
8589934464 blocks 64k chunks
unused devices: <none>
cat /proc/partitions:
------------------------
major minor #blocks name
8 0 244140288 sda
8 1 248832 sda1
8 2 1952768 sda2
8 3 241937408 sda3
8 16 17578123776 sdb
8 17 17578122240 sdb1
8 32 17578123776 sdc
8 33 17578122240 sdc1
The two RAID6-hardware RAID arrays are recognized correctly by the system,
further the Areca controllers are also working correctly.
I suspect there is a kernel bug, preventing mdadm to get the correct
device sizes for large size raid arrays.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: mdadm 2.6.7.1-1ubuntu15
ProcVersionSignature: Ubuntu 2.6.32-33.72-generic 2.6.32.41+drm33.18
Uname: Linux 2.6.32-33-generic x86_64
Architecture: amd64
Date: Fri Nov 1 12:09:02 2013
MDadmExamine.dev.sda: Error: command ['/sbin/mdadm', '-E', '/dev/sda'] failed
with exit code 1: mdadm: No md superblock detected on /dev/sda.
MDadmExamine.dev.sda1: Error: command ['/sbin/mdadm', '-E', '/dev/sda1']
failed with exit code 1: mdadm: No md superblock detected on /dev/sda1.
MDadmExamine.dev.sda2: Error: command ['/sbin/mdadm', '-E', '/dev/sda2']
failed with exit code 1: mdadm: No md superblock detected on /dev/sda2.
MDadmExamine.dev.sda3: Error: command ['/sbin/mdadm', '-E', '/dev/sda3']
failed with exit code 1: mdadm: No md superblock detected on /dev/sda3.
MDadmExamine.dev.sdb: Error: command ['/sbin/mdadm', '-E', '/dev/sdb'] failed
with exit code 1: mdadm: No md superblock detected on /dev/sdb.
MDadmExamine.dev.sdc: Error: command ['/sbin/mdadm', '-E', '/dev/sdc'] failed
with exit code 1: mdadm: No md superblock detected on /dev/sdc.
MachineType: Supermicro X8DTU
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-33-generic
root=UUID=fdee92a7-11e6-4999-8d24-473a8c7986b4 ro quiet splash
ProcEnviron:
LC_TIME=
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcMDstat:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md0 : active raid0 sdb1[0] sdc1[1]
35156244352 blocks 64k chunks
unused devices: <none>
SourcePackage: mdadm
dmi.bios.date: 08/03/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.1c
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: X8DTU
dmi.board.vendor: Supermicro
dmi.board.version: 1234567890
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 1234567890
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr2.1c:bd08/03/2012:svnSupermicro:pnX8DTU:pvr1234567890:rvnSupermicro:rnX8DTU:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
dmi.product.name: X8DTU
dmi.product.version: 1234567890
dmi.sys.vendor: Supermicro
etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'
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