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Message #47146
[Bug 974275] Re: md trancates devices with kernel >=2.6.32-37-server
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/974275
Title:
md trancates devices with kernel >=2.6.32-37-server
Status in “linux” package in Ubuntu:
Expired
Bug description:
After updating the kernel to one >=2.6.32-37 our MD device decided to
show up as only a fraction of it's previous size.
With the previous kernel, md0 shows up (correctly) as 85681.66 GiB,
but with the newer kernel it shows up as only 8192.00 GiB - a serious
order of magnitude different! Needless to say, with the incorrect size
being reported/used, the md device is unusable and prevents access to
the partitions on it.
Whilst running 2.6.32-33-server:
root@saturn:~# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Mon Aug 9 09:15:41 2010
Raid Level : raid0
Array Size : 89843731712 (85681.66 GiB 91999.98 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Aug 9 09:15:41 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Chunk Size : 128K
UUID : 1c27f277:0fbb69c8:852484a6:e390a598 (local to host saturn)
Events : 0.1
Number Major Minor RaidDevice State
0 8 32 0 active sync /dev/sdc
1 8 48 1 active sync /dev/sdd
root@saturn:~# cat /proc/partitions
major minor #blocks name
8 0 488386584 sda
8 1 468581376 sda1
8 2 1 sda2
8 5 19803136 sda5
8 16 488386584 sdb
8 17 468581376 sdb1
8 18 1 sdb2
8 21 19803136 sdb5
8 32 44921865984 sdc
9 2 468581312 md2
8 48 44921865984 sdd
9 0 89843731712 md0
259 0 89843731200 md0p1
root@saturn:~# fdisk -l /dev/md0
WARNING: GPT (GUID Partition Table) detected on '/dev/md0'! The util
fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/md0: 92000.0 GB, 91999981273088 bytes
255 heads, 63 sectors/track, 11185027 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/md0p1 1 267350 2147483647+ ee GPT
Partition 1 does not start on physical sector boundary.
But whilst running 2.6.32-40-server:
root@saturn:~# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Mon Aug 9 09:15:41 2010
Raid Level : raid0
Array Size : 8589934336 (8192.00 GiB 8796.09 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Aug 9 09:15:41 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Chunk Size : 128K
UUID : 1c27f277:0fbb69c8:852484a6:e390a598 (local to host saturn)
Events : 0.1
Number Major Minor RaidDevice State
0 8 32 0 active sync /dev/sdc
1 8 48 1 active sync /dev/sdd
root@saturn:~# cat /proc/partitions
major minor #blocks name
8 0 488386584 sda
8 1 468581376 sda1
8 2 1 sda2
8 5 19803136 sda5
8 16 488386584 sdb
8 17 468581376 sdb1
8 18 1 sdb2
8 21 19803136 sdb5
8 48 44921865984 sdd
8 32 44921865984 sdc
9 2 468581312 md2
9 0 8589934336 md0
root@saturn:~# fdisk -l /dev/md0
WARNING: GPT (GUID Partition Table) detected on '/dev/md0'! The util
fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/md0: 8796.1 GB, 8796092760064 bytes
255 heads, 63 sectors/track, 1069397 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/md0p1 1 267350 2147483647+ ee GPT
Partition 1 does not start on physical sector boundary.
This is a major bug introduced on (what should be) a mature LTS
release, and will need addressing ASAP.
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