Hi everybody! I'm using LVM and ext3 and am very satisfied with it. But now I have the following problem: I have a filesystem on a LV which is in use - files are created, modified and so on. To do a backup I'd like to create a snapshot of this volume which gets backup'd and then dropped. # lvcreate -s -L 20M -n snapshot /dev/vg/data lvcreate -- WARNING: the snapshot will be automatically disabled once it gets full lvcreate -- INFO: using default snapshot chunk size of 64.00 KB for "/dev/vg/snapshot" lvcreate -- doing automatic backup of "vg" lvcreate -- logical volume "/dev/vg/snapshot" successfully created So far, so good. Now I want to mount that filesystem - after all, it's possible several GB of which only parts are used. (statements mixed with output in /var/log/messages ">") # mount /dev/vg/snapshot /mnt/tmp/ mount: block device /dev/vg/snapshot is write-protected, mounting read-only mount: wrong fs type, bad option, bad superblock on /dev/vg/snapshot, or too many mounted file systems > EXT2-fs: lvm(58,12): couldn't mount because of unsupported optional features (4). # mount /dev/vg/snapshot /mnt/tmp/ -t ext3 mount: block device /dev/vg/snapshot is write-protected, mounting read-only mount: wrong fs type, bad option, bad superblock on /dev/vg/snapshot, or too many mounted file systems > EXT3-fs: INFO: recovery required on readonly filesystem. > EXT3-fs: write access unavailable, cannot proceed. So looking in the kernel sources I find some mount-options ... # mount /dev/vg/snapshot /mnt/tmp/ -t ext3 -o ro,errors=remount-ro mount: wrong fs type, bad option, bad superblock on /dev/vg/snapshot, or too many mounted file systems > EXT3-fs: INFO: recovery required on readonly filesystem. > EXT3-fs: write access unavailable, cannot proceed. # mount /dev/vg/snapshot /mnt/tmp/ -t ext3 -o ro,errors=remount-ro,noload mount: wrong fs type, bad option, bad superblock on /dev/vg/snapshot, or too many mounted file systems > ext3: No journal on filesystem on lvm(58,12) If the snapshot wasn't ro I'd do a tune2fs or e2fsck or something. So can somebody please drop me a hint? Is that not possible? Thanks in advance!! Regards, Phil
