Partitions will not mount once target system is reimaged using dd
I am trying to dd an entire hard drive and copy it to another harddrive and experiencing problems for which I can't seem to find an answer.
Questions:
What do the error messages below indicate? Is there a solution?
Are the error messages due to the difference in drive sizes?
Is it possible to dd from a larger drive size to a smaller drive size? If not is there another, free, solution to reimage linux systems. I'm asking b/c I have secured the source system which took a considerable amount of time using DoD and NSA standards and don't want to lose this work.
The source system is an HP Proliant DL380 G5 using Red Hat Enterprise Linux 6 (2.6.32-71.24.1.el6.x86_64), RAID6, LVM (v2.02) on an ext4 filesystem.
Source system:
1) booted via RHEL live cd into rescue mode
2) unmounted all partitions
3) mounted external harddrive
4) dd source drive to external harddrive using the following:
Target system:
1) booted via RHEL live cd in rescue mode
2) did not mount any partitions
3) mounted external drive
4) Used the following to dd image onto target drive:
1027.5GB drive
Device Start End Id System
/dev/cciss/c0d0p1 1 63 83 Linux
/dev/cciss/c0d0p2 63 1092 83 Linux
/dev/cciss/c0d0p3 1092 2120 82 Linux swap
/dev/cciss/c0d0p4 2120 245930 5 Extended
/dev/cciss/c0dop5 2120 245930 8e Linux LVM
Disk /dev/dm-0: 16.1 GB
Disk /dev/dm-1: 5368 MB
Disk /dev/dm-2: 42.9 MB
Disk /dev/dm-3: 4294 MB
Disk /dev/dm-4: 10.7 GB
Disk /dev/dm-5: 5368 MB
Disk /dev/dm-6: 5368 MB
Disk /dev/dm-7: 10.7 GB
Disk /dev/dm-8: 917.7 GB
fdisk on target system after reimage and reboot:
Code:
880.7 GB
Device Start End Id System
/dev/cciss/c0d0p1 1 63 83 Linux
/dev/cciss/c0d0p2 63 1092 83 Linux
/dev/cciss/c0d0p3 1092 2120 82 Linux swap
/dev/cciss/c0d0p4 2120 245930 5 Extended
/dev/cciss/c0dop5 2120 245930 8e Linux LVM
Disk /dev/dm-0: 16.1 GB
Disk /dev/dm-1: 5368 MB
Disk /dev/dm-2: 42.9 MB
Disk /dev/dm-3: 4294 MB
Disk /dev/dm-4: 10.7 GB
Disk /dev/dm-5: 5368 MB
Disk /dev/dm-6: 5368 MB
Disk /dev/dm-7: 10.7 GB
dm-8 is missing.
After reimage and reboot of target system:
/dev/cciss/c0d0p2 is mounted as /
Error messages after rebooting the target system:
Code:
Starting udev: [ OK ]
Setting hostname <hostname> [ OK ]
Setting up Logical Volume Management: device-mapper: resume ioctl failed: Invalid argument
Unable to resume VolGroup00-LogVol08 (253:8)
9 logical volume(s) in volume group "VolGroup00" now active
[ FAILED ]
Checking filesystems
/dev/cciss/c0d0p2: clean, 46302/262144 files, 398491/1048576 blocks
/dev/cciss/c0d0p1: clean, 52/64000 files, 83027/25600 blocks
/dev/mapper/VolGroup00-LogVol00: clean 3838/327680 files, 72018/1310720 blocks
fsck.ext4: Invalid argument while trying to open /dev/mapper/VolGroup00-LogVol08 /dev/mapper/VolGroup00-LogVol08:
The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something
else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device>
/dev/mapper/VolGroup00-LogVol01: clean, 28/655360 files, 92667/2621440 blocks
/dev/mapper/VolGroup00-LogVol02: clean, 12/655360 files, 79664/2621440 blocks
/dev/mapper/VolGroup00-LogVol03: clean, 84138/327680 files, 723042/1310720 blocks
/dev/mapper/VolGroup00-LogVol04: clean, 5712/327680 files, 144135/1310720 blocks
/dev/mapper/VolGroup00-LogVol05: clean, 84/983040 files, 107055/3932160 blocks
/dev/mapper/VolGroup00-LogVol06: clean, 12/262144 files, 53548/1048576 blocks
/dev/mapper/VolGroup00-LogVol07: clean, 86/2621440 files, 209648/10485760 blocks
[ FAILED]
*** An error occured during the file system check.
*** Dropping you to a shell: the sytem will reboot
*** when you leave the shell.
Not sure what info is needed to solicit help so I have included more detail then may be necessary.
The problem is this: you made a 1:1 copy of a harddisk, and wrote that to a much smaller disk. dd doesn't care about that, and didn't say anything since you specified the noerror option. Everything that's in the final part of the image that didn't fit on the target disk was silently discarded, apparently including a lot of LVM and Ext4 information.
To get a better copy that can handle different disk sizes, take a look at Clonezilla. They claim to be the Norton Ghost equivalent for Linux, but I haven't tested that claim yet.
Thx. I checked out Clonezilla's site and imaging from a larger to smaller disk is not supported. However, the site refers to Parted as a possibility. I'll check that out as well.
Parted is a partition editor that can expand and shrink a partition or logical volume, not an imaging tool. What you can do is use Parted to shrink all LVMs to the minimal necessary size, shrink the PVs behind the VG, clone the disk to the new system, and reverse the steps there.
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