On 08/04/2014 02:47 PM, Niels de Vos wrote:
On Mon, Aug 04, 2014 at 01:49:03PM -0400, Robert Moskowitz wrote:
I am getting far enough into my system build that I don't want to go
back to square one everytime I mess up. So I decided I SHOULD be
able to clone my boot drive with:
sudo dd if=/dev/sdb of=/dev/sdc bs=4096 conv=notrunc,noerror; sync
And I did check that my working card is in sdb and the target is
sdc. Note that the target drive has been used for prior testing.
But this cloned card fails to boot, so there is something wrong with
the above command. Here is the end of what I am seeing on the
console in the boot:
...
[ 13.911063] systemd-fsck[368]: _/: The filesystem size (according
to the superblock) is 3587707 blocks
[ OK ] Started dracut pre-mount hook.
[ 13.919598] systemd-fsck[368]: The physical size of the device is
3548795 blocks
[ 13.937109] systemd-fsck[368]: Either the superblock or the
partition table is likely to be corrupt!
...
[ 14.571964] EXT4-fs (mmcblk0p3): bad geometry: block count
3587707 exceeds size of device (3548795 blocks)
[FAILED] Failed to mount /sysroot.
During boot, is is detected that the size of the filesystem (stored in
the filesystems meta-data) is larger than the partition where it is
located. This suggests that the 'clone' is written to a smaller sd-card
than the original.
Interesting. I bought these cards as a batch. Well rather I reached
into the bin at the checkout counter and took out 8 16Gb microSD cards.
So there differing size is probably due to quality control issues or such.
You might be able to 'fix' your working card, by resizing the filesystem
of the 3rd partition. In the system where you do the 'dd', the partition
would be '/dev/sdb3' and the commands you can use are 'resize2fs' or
'parted'.
When I mount the card back in my notebook, only __boot is being
automounted. __ is not mounting. And Gparted is showing the card as
14.49Gb of 'unallocated' space. Not even showing __boot and the swap
partitions.
So I will have to read the manpages on parted and resize2fs to figure
them out. Oh, /dev/sdb1, sbd2, and sbd3 are showing when I do an 'ls
/dev/sd*'.
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