[LU-6724] Downgrading from 2.8 with DNE2 patches to 2.5 servers fails: unsupported read-only filesystem feature(s) 2

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.8.0
• Labels: dne2
• Environment: Lustre 2.5.3 servers plus lastest Lustre 2.8 with DNE2 patches.

Epic/Theme

dne

• Severity: 3
• Assignee: Lai Siyao
• Reporter: James A Simmons

Description

This morning I updated to the latest vanilla master and ended up in a state where I could not mount the file system. So I tried migrating back to lustre 2.5 and when I attempted to mount the file system I got these errors:

[ 1025.018232] Lustre: Lustre: Build Version: 2.5.4--CHANGED-2.6.32-431.29.2.el6.atlas.x86_64
[ 1062.767104] LDISKFS-fs (dm-7): recovery complete
[ 1062.791599] LDISKFS-fs (dm-7): mounted filesystem with ordered data mode. quota=on. Opts:
[ 1063.389770] LustreError: 24686:0:(ofd_fs.c:594:ofd_server_data_init()) sultan-OST0000: unsupported read-only filesystem feature(s) 2
[ 1063.412582] LustreError: 24686:0:(obd_config.c:572:class_setup()) setup sultan-OST0000 failed (-22)
[ 1063.421818] LustreError: 24686:0:(obd_config.c:1629:class_config_llog_handler()) MGC10.37.248.67@o2ib1: cfg command failed: rc = -22
[ 1063.433944] Lustre: cmd=cf003 0:sultan-OST0000 1:dev 2:0 3:f
[ 1063.440506] LustreError: 15b-f: MGC10.37.248.67@o2ib1: The configuration from log 'sultan-OST0000'failed from the MGS (-22). Make sure this client and the MGS are running compatible versions of Lustre.
[ 1063.458690] LustreError: 15c-8: MGC10.37.248.67@o2ib1: The configuration from log 'sultan-OST0000' failed (-22). This may be the result of communication errors between this node and the MGS, a bad configuration, or other errors. See the syslog for more information.
[ 1063.482398] LustreError: 24600:0:(obd_mount_server.c:1254:server_start_targets()) failed to start server sultan-OST0000: -22
[ 1063.493822] LustreError: 24600:0:(obd_mount_server.c:1737:server_fill_super()) Unable to start targets: -22
[ 1063.503768] LustreError: 24600:0:(obd_mount_server.c:847:lustre_disconnect_lwp()) sultan-MDT0000-lwp-OST0000: Can't end config log sultan-client.
[ 1063.516947] LustreError: 24600:0:(obd_mount_server.c:1422:server_put_super()) sultan-OST0000: failed to disconnect lwp. (rc=-2)
[ 1063.528574] LustreError: 24600:0:(obd_config.c:619:class_cleanup()) Device 3 not setup
[ 1063.539611] Lustre: server umount sultan-OST0000 complete
[ 1063.545093] LustreError: 24600:0:(obd_mount.c:1330:lustre_fill_super()) Unable to mount /dev/mapper/sultan-ddn-l0 (-22)
[ 1070.949382] LDISKFS-fs (dm-6): recovery complete
[ 1070.956045] LDISKFS-fs (dm-6): mounted filesystem with ordered data mode. quota=on. Opts:
[ 1071.472962] LustreError: 24982:0:(ofd_fs.c:594:ofd_server_data_init()) sultan-OST0004: unsupported read-only filesystem feature(s) 2
[ 1071.495949] LustreError: 24982:0:(obd_config.c:572:class_setup()) setup sultan-OST0004 failed (-22)
[ 1071.505140] LustreError: 24982:0:(obd_config.c:1629:class_config_llog_handler()) MGC10.37.248.67@o2ib1: cfg command failed: rc = -22

Issue Links

• is related to: LU-6050 Master testing: Unable to set striping after master downgrade to 2.5
• is related to: LU-6663 DNE2 directories has very very bad performance