On Sun, Dec 16, 2012 at 08:04:01PM -0800, Anders Lind wrote: > > I tired to use tune2fs metadata_csum feature on my ext4 filesystem. > I got message like: > ~$ sudo tune2fs -O metadata_csum /dev/sda5 > tune2fs 1.42 (29-Nov-2011) > Setting filesystem feature 'metadata_csum' not supported. > > Is this tool supposed been used on unmounted device or it could be mounted? TYhe metadata_csum feature is in the e2fsprogs "master" branch in the e2fsprogs git tree. The feature is not part of an official e2fsprogs release yet. One of the things that I want to really check very carefully before I release e2fsprogs 1.43 is that e2fsck sanely recovers from checksum failures while it tries replaying the journal. Essentially, metadata_csum is supposed to provide better recovery from device failures (it doesn't really provide any kind of performance advantage), and I want to be 100% sure that it is **always** better when hardware-induced corruption happens before we release it. Regards, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
