[Lustre-discuss] version 1.4 mount 1.6

[Andreas Dilger]

On Jan 21, 2008  12:59 -0500, Aaron Knister wrote:
> I have a client running 1.4.11 and i want to mount a filesystem that's  
> running on 1.6.4.1 servers. On the client I can ping the servers using  
> lctl however a mount fails with an LBUG on the mds.
> 
> The mount command on the 1.4.11 client is --
> 
> mount -t lustre 192.168.64.70 at o2ib:/data-mdtlov/client /mnt/lustre
> 
> The error on the server is --
> 
> LustreError: 7369:0:(lov_obd.c:227:lov_connect()) ASSERTION(lov- 
>  >lov_connects == 1) failed
> LustreError: 7369:0:(tracefile.c:431:libcfs_assertion_failed()) LBUG
> ll_mdt_24     R  running task       0  7369      1          7370  7368  
> (L-TLB)
>   ffff81026e92ddd0 ffff8102ba45045c ffff810418438dc0 ffff8102823e0200
>   0000000000000000 ffff810296765000 0000000000000000 ffff81041c2fd280
>   ffffffff888c029f 0000000000000286 ffffffff8003cd0e ffff810418438140
> Call Trace:
>   [<ffffffff888c029f>] :mds:mds_handle+0xe7f/0x56ff
>   [<ffffffff8003cd0e>] lock_timer_base+0x1b/0x3c
>   [<ffffffff8001c1a2>] __mod_timer+0xb0/0xbe
>   [<ffffffff885dcfb0>] :obdclass:class_conn2export+0x250/0x2d0
>   [<ffffffff8868e277>] :ptlrpc:ptlrpc_main+0x1437/0x1df0
>   [<ffffffff800867b0>] default_wake_function+0x0/0xe
>   [<ffffffff8005bc25>] child_rip+0xa/0x11
>   [<ffffffff8868ce40>] :ptlrpc:ptlrpc_main+0x0/0x1df0
>   [<ffffffff8005bc1b>] child_rip+0x0/0x11
> 
> I thought 1.4 could mount a 1.6 filesystem.

Only if the filesystem was previously upgraded from a 1.4 system.  If
it was formatted as 1.6 initially there is no "downgrade" compatibility
in the configuration logs.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.