Debian – No posix acl in debian Wheezy with ext4

Every time you perform an operation with LVM, by default, the previous metadata is archived in /etc/lvm/archive. You can use vgcfgrestore to restore it, or grab the extends by hand (harder, but lvcreate(8) should cover it).

Edit:

And to make it as easy as possible, I should add that you can find the last backup before your destructive operation by looking at descriptions:

# grep description /etc/lvm/archive/vg01_*
/etc/lvm/archive/vg01_00001.vg:description = "Created before executing 'lvremove -f /dev/vg01/foo'"
/etc/lvm/archive/vg01_00002.vg:description = "Created before executing 'lvremove -f /dev/vg01/bar'"
/etc/lvm/archive/vg01_00003.vg:description = "Created before executing 'lvremove -f /dev/vg01/baz'"

Edit:

The normal allocation policy (default one) will allocate a stripe from the first free PE when there is enough room to do so. If you want to confirm where the LV was allocated, you can look in the archive files, those are perfectly readable by humans.

Don't do it. The experimental ext4 module that was included in Lenny isn't safe or sane to use on a disk that you actually want to store data on.

Still, the mount operation should work alright once the test_fs flag is set. What's the exact output from these commands, filled in with the relevant info for your system?

tune2fs -E test_fs /dev/sdXX
mount -t ext4dev -o ro /dev/sdXX /mnt/mountpoint