[Lustre-discuss] Multiple FS in one MDS

[Kevin Van Maren]

If the question is whether you can have multiple file systems on the 
same servers, the answer is yes.
1) Need a new LUN/partition for the MDT
2) Need new LUN/partitions for the OST to provide space for that file 
system, as an OST belongs to exactly one Lustre file system

It looks like you added a second MDT, but did not add any OSTs for the 
NGS file system?

If the question is whether you can take one file system and mount parts 
of it at different places on the client, then that answer is also yes: 
look at "mount --bind" which can make a file system (or subdir) appear 
at a different location.

Kevin


Fabio Cassarotti Parronchi Navarro wrote:
> Hi,
>
> We recently started using Lustre in production environment for a small 
> storage and we are currently testing speed and reliability. So far, 
> everyone is exited with it.
> But here comes the problem. Is it possible to create another mount 
> point on the same server that is already running a MDS ?
>
> For example:
>   [MDSHOST]@tcp:/Projects ( current )
>   [MDSHOST]@tcp:/NGS      ( new )
>
> Actually, I've been able to create another partition on the MDS using 
> ( --fsname=NGS ) and mount it, the OSSs seems to be running nicely too 
> ( at least no problems are reported on the log files ). But when I try 
> to mount NGS file system on the clients, the mount command freezes 
> with no output on the logs
>
> mount -t lustre [MDSHOST]@tcp:/NGS /home/NGS/
>
> The MDS logs:
>
> Aug  4 08:32:02 pnq1 kernel: LustreError: 
> 19304:0:(ldlm_lib.c:1848:target_send_reply_msg()) @@@ processing error 
> (-11)  req at ffff810112097800 x1338817395530034/t0 o38-><?>@<?>:0/0 lens 
> 368/0 e 0 to 0 dl 1280921622 ref 1 fl Interpret:/0/0 rc -11/0
> Aug  4 08:32:24 pnq1 kernel: LustreError: 
> 19304:0:(ldlm_lib.c:1848:target_send_reply_msg()) @@@ processing error 
> (-11)  req at ffff810226542000 x1338817395530041/t0 o38-><?>@<?>:0/0 lens 
> 368/0 e 0 to 0 dl 1280921644 ref 1 fl Interpret:/0/0 rc -11/0
> Aug  4 08:32:24 pnq1 kernel: LustreError: 
> 19304:0:(ldlm_lib.c:1848:target_send_reply_msg()) Skipped 1 previous 
> similar message
> Aug  4 08:33:01 pnq1 kernel: LustreError: 
> 19297:0:(ldlm_lib.c:1848:target_send_reply_msg()) @@@ processing error 
> (-11)  req at ffff8101fc298c00 x1336109251604116/t0 o38-><?>@<?>:0/0 lens 
> 368/0 e 0 to 0 dl 1280921681 ref 1 fl Interpret:/0/0 rc -11/0
> Aug  4 08:33:01 pnq1 kernel: LustreError: 
> 19297:0:(ldlm_lib.c:1848:target_send_reply_msg()) Skipped 4 previous 
> similar messages
> Aug  4 08:33:07 pnq1 kernel: Lustre: NGS-MDT0000: temporarily refusing 
> client connection from 192.168.10.49 at tcp
>
> Do I have to change any config on the MDS to fix this issue? Or this 
> architecture is not supported by Lustre ?
>
> Thanks in advice,
> Fábio Navarro
>
> -- 
> Ludwig Insitute for Cancer Research LTDA
> Laboratory of Computational Biology
> 245 João Julião St - 1th floor
> CEP 01323-903 - Sao Paulo - Brazil
> Phone: 55 11 33883232
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