[Lustre-discuss] MDT Failover not functioning properly with Lustre FS

[Chadha, Narjit]

Would you know the correct MDS mount syntax (for OSTs and Clients) for
an MDS failover?

For the OSSs , it does not appear to take the form:

mkfs.lustre --ost --fsname=lustrefs --mgsnid=mds[1-2] /dev/sdb1 **
mount -t lustre /dev/sdb1 /mnt/lustre

,where mds1,mds2 are the mgsnids of the primary and failover MDSs. There
is parsing error for mds[1-2] **, but knows of both mds1 and mds2
independently.

For the clients, it does not appear to take the form:

mount -t lustre mds[1-2]:/lustrefs /mnt/lustre **

Lustre cannot parse mds[1-2] ** , but knows of both mds1 and mds2
independently.

As mentioned, I have tried comma separated names and colon separated
names as well with no effect. The problem is with the mgsnid name
structure. The ** only show where the errors occur. The MDS on its own
fails over seamlessly and was not mentioned above (it also has the same
fsname).

Thanks

N.


-----Original Message-----
From: Andreas.Dilger at sun.com [mailto:Andreas.Dilger at sun.com] On Behalf
Of Andreas Dilger
Sent: Friday, February 22, 2008 7:08 PM
To: Chadha, Narjit
Cc: lustre-discuss at lists.lustre.org; Sheila.Barthel at sun.com
Subject: Re: [Lustre-discuss] MDT Failover not functioning properly with
Lustre FS

On Feb 21, 2008  13:14 -0800, Chadha, Narjit wrote:
> The only thing left is to be able to mount
> the failover mds configuration on the OSS. The sytax:
> 
>  
> 
> mkfs.lustre --ost -fsname=mylustre -mgsnid=lustre0[1-2] /dev/sdb1

I think this is a defect in the manual.  It should be "--fsname" and
"--mgsnid" I believe.  Please confirm that is the issue and the manual
can be updated.



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