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Can't resize2fs - combination of flex_bg and !resize_inode

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http://serverfault.com – I recently set up my first software raid with mdadm and after adding more disks to the raid I am unable to resize the filesystem to the full size of the raid. I created a single (~16TB) filesystem on /dev/md0 via: mkfs.ext4 -v -b 4096 -t huge -E stride=128,stripe-width=256 /dev/md0 I then waited painfully for a couple of days as all of the data from the old raid copied over to the new raid; I moved over the disks and grew the raid and then finally I: resize2fs -p /dev/md0 Which informs me that resize2fs 1.42 (29-Nov-2011) resize2fs: /dev/md0: The combination of flex_bg and !resize_inode (HowTos)