What steps did you take to do this?
This was an existing 2.1.6, upgraded to 2.4.2 while stil using combined
MDS/MGS.
MGS was split using:
mkfs.lustre --mgs <new-mgs-device>
mount -t ldiskfs <old-mgs-device> /mnt/1
mount -t ldiskfs <new-mgs-device> /mnt/2
cp -r /mnt/1/CONFIGS/testfs-* /mnt/2/CONFIGS
then I did --nomgs on the previous combo device.
Actually the entire filesystem came up correctly after that: MGT MDT 4 x
OSTs.
The system was taken down for hardware maintenance and I encountered this
"AT" osp issue on restart.
The system was cleanly unmounted (or so I thought).
Thanks.