[lustre-discuss] 2.10.1 client fails to mount on 2.9 backend

[Christopher Johnston]

Just tested the new 2.10.1 client against one of my fileservers where I
have 2.9 running.   Works with 2.10.0 but not 2.10.1, is this expected?

# mount -t lustre 172.30.69.90:/qstore /mnt
mount.lustre: mount 172.30.69.90:/qstore at /mnt failed: No such file or
directory
Is the MGS specification correct?
Is the filesystem name correct?
If upgrading, is the copied client log valid? (see upgrade docs)

# dmesg -e | tail -4
[Nov17 16:15] LustreError: 22344:0:(ldlm_lib.c:483:client_obd_setup())
can't add initial connection
[  +0.009423] LustreError: 22344:0:(obd_config.c:608:class_setup()) setup
MGC172.30.69.90 at tcp failed (-2)
[  +0.009755] LustreError: 22344:0:(obd_mount.c:203:lustre_start_simple())
MGC172.30.69.90 at tcp setup error -2
[  +0.010193] LustreError: 22344:0:(obd_mount.c:1505:lustre_fill_super())
Unable to mount  (-2)

-Chris
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