umount fails with device is busy

I'm trying to run xfs_repair on my filesystem:
Firstly to unmount the fs

umount /myfs
umount: /myfs: device is busy
umount: /myfs: device is busy

lsof /dev/sda

-show none ie nothing seems to be 'touching' the disk. confused why its still showing device is busy

i did a force unmount then

#umount -l /dev/sda

but then when I try to run xfs_repair

xfs_repair -n /dev/sda, it
xfs_repair: /dev/sda contains a mounted and writable filesystem

fatal error -- couldn't initialize XFS library

lsof /dev/sda
shows nothing ie nothing seems to be 'touching' the disk. makes me wonder whether this is a xfs issue now??

Any thoughts???

Thanks
David

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