Hi All, We are recovering from a Lustre 1.6 error. We believe this error resulted from several drives failing simultaneously. We replaced the failed drives and while down, upgraded the controller & enclosure firmware on the S2A9900. After getting the appliance back online we are now trying to run e2fsck on all 20 luns to verify. 4 of the 20 luns report: --------------------------- begin e2fsck (e2fsck 1.40.11.sun1) ----- e2fsck: MMP: invalid magic number in header while trying to open /dev/mpath/lun_20 /dev/mpath/lun_20: The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> ------------------------------------------------------------------- As per another post: http://comments.gmane.org/gmane.comp.file-systems.lustre.user/10443 it seems ''tune2fs -f -E clear-mmp /dev/device'' can be used to clear the flag. My questions are: 1. Is the a recommended course of action here? 2. Does this increase the chance of data loss? I''ll be happy to provide more info upon request. Please advise. Best Regards, DaMiri