I accidentally managed to fill up the persistent COW snapshot overlay on my Fedora20 USB & it got flagged Invalid thus rendering the Live USB unbootable since the root filesystem couldn't be mounted. dmsetup status live-rw 0 8388608 snapshot Invalid. Subsequently I used a 2011 thread(link below) on the dm-devel mailing list ( Alasdair Kergon, Frederick Grose etc.) and flipped the invalid bit in the overlay file by booting a different system and attaching the USB stick to it. Like so: echo $'\x01' | dd of=/run/media..../liveuser/LIVE.../overlay-LIVE-17F4-055A bs=1 count=1 seek=4 conv=notrunc hexdump of the file verified the flipped 5th byte. Now the LiveUSB boots & I can successfully see my data but it's hard to do anything more since it gets full almost immediately after I boot. Is there a way to grow the overlay file? Would this work? dd if=/dev/zero of=overlay-LIVE-17F4-055A seek=overlay_size count=size_increase How do I compute the number overlay_size? I suppose size_increase can be some large number? Or are more steps needed to expand the overlay? http://thread.gmane.org/gmane.linux.kernel.device-mapper.devel/14644 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
