While performing Rolling downgrade testing for bfs from master to 2.10, I am unable to import the zpool.
1. Started with all clients and servers with 2.10 build 5 and build the Lustre File system
2. Upgraded OSS to master re-mounted and ran sanity.sh
3. Upgraded MDS to master , remounted and ran sanity.sh
4. Upgraded Clients to master, remounted and ran sanity.sh
5. Downgraded Clients to 2.10. remounted and ran sanity.sh
6. Downgraded MDS to 2.10, while importing zpools the above message appears and I am unable to import zpools.