On Thu, 2010-09-09 at 18:11 +0800, KMing wrote: > Any recommendation about the sequence to umount multiple lustre file > system with combined MGS/MDT or separate MGS, MDT. Thanks.
This question actually answers itself if you think about it logically. If you unmount OSTs first, you leave the possibility of a client getting object references to OSTs which are no longer able to answer. So leave the OSTs mounted to help drain any remaining requests and unmount the MDT first. Once the MDT is unmounted, unmount the OSTs. The MGS is not involved in unmounting so it can be unmounted at any time. b.
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