[lustre-discuss] Centos 7.7 upgrade

[Alastair Basden]

Hi,

We have just upgraded Lustre servers from 2.12.2 on centos 7.6 to 2.12.3 
on centos 7.7.

The OSSs are on top of zfs (0.7.13 as recommended), and we are using 
3.10.0-1062.1.1.el7_lustre.x86_64

After the update, Lustre will no longer mount - and messages such as:
Jun  2 00:02:44 hostname kernel: LustreError: 158-c: Can't load module 'osd-zfs'
Jun  2 00:02:44 hostname kernel: LustreError: Skipped 875 previous similar messages
Jun  2 00:02:44 hostname kernel: LustreError: 226253:0:(genops.c:397:class_newdev()) OBD: unknown type: osd-zfs
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_config.c:403:class_attach()) Cannot create device lustfs-OST0006-osd of type osd-zfs : -19
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_config.c:403:class_attach()) Skipped 881 previous similar messages
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_mount.c:197:lustre_start_simple()) lustfs-OST0006-osd attach error -19
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_mount.c:197:lustre_start_simple()) Skipped 881 previous similar messages
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_mount_server.c:1947:server_fill_super()) Unable to start osd on lustfs-ost6/ost6: -19
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_mount_server.c:1947:server_fill_super()) Skipped 881 previous similar messages
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_mount.c:1608:lustre_fill_super()) Unable to mount  (-19)
Jun  2 00:02:44 hostname kernel: LustreError: 226265:0:(obd_mount.c:1608:lustre_fill_super()) Skipped 881 previous similar messages
Jun  2 00:02:44 hostname kernel: LustreError: 226253:0:(genops.c:397:class_newdev()) Skipped 887 previous similar messages

Does anyone have any ideas?

Thanks,
Alastair.