On Fri, Apr 26 2013, Andrea Conti wrote: > Hi, > >> EXT3-fs (sda5): error: couldn't mount because of unsupported optional > features (240) > >> /dev/sda5 / ext4 noatime,discard 0 1 > > When first mounting the root filesystem the kernel has no access to > /etc/fstab and therefore by default tries mounting it with all available > FS drivers until one succeeds. ext3 (or ext4 in ext3 mode) is tried > before ext4 and you get that error when it fails because the filesystem > is using ext4-only features such as extents. > > You can avoid that by adding "rootfstype=ext4" to the kernel command line. > >> Since all my fs are ext4 I could remove ext3 support from the kernel >> (3.5.4). Is that the recommended procedure? > > You can remove ext2/ext3 support even if you still have ext2/ext3 > filesystems around; the ext4 driver is backwards compatible and can > handle those with no problems. You just have to make sure that > CONFIG_EXT4_USE_FOR_EXT23 is set in your kernel configuration. > > HTH > andrea
Thanks. I didn't know about rootfstype. allan
