[Lustre-discuss] question about failnode with mixed networks

[Jeffrey Bennett]

Hi John,

Yes, you can use multiple MGS, but you have to tell the OSTs, in this way (example):

mkfs.lustre --fsname testfs --ost --mgsnode=mds0 at tcp0 --mgsnode=mds1 at tcp0 /dev/sda

Whenever you mount the filesystem, mount it this way:

mount -t lustre mds0 at tcp0:mds1 at tcp0:/testfs /mnt/testfs

Jeffrey A. Bennett
HPC Systems Engineer
San Diego Supercomputer Center
http://users.sdsc.edu/~jab

-----Original Message-----
From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of John White
Sent: Tuesday, November 24, 2009 1:20 PM
To: Brian J. Murrell
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [Lustre-discuss] question about failnode with mixed networks

Excellent, thanks for the replies.  One more question:
Is there a --failnode corollary for MGTs...?  Does lustre support MGT/S failover?

On Nov 16, 2009, at 6:51 AM, Brian J. Murrell wrote:

> On Fri, 2009-11-13 at 14:34 -0800, John White wrote: 
>> 
>> In a failover situation, it would appear that tcp connected clients do not get the hint to switch over to the secondary MDS
> 
> Clients don't (yet) get "hints" to switch servers.  Clients continue to
> use a server until they don't get a response, at which time they cycle
> through their list of NIDs for the unresponsive service.
> 
>> When I initially set up the file system, I specified --failnode for the @o2ib interfaces,
> 
> Only the @o2ib interfaces?
> 
>> should I have also specified NIDs for the @tcp0 during the fs construction?
> 
> Yes.  You specify the NIDs for all servers that should be considered for
> that service.
> 
>> If so, is it possible to add this as an afterthought?
> 
> You want tunefs.lustre.
> 
> b.
> 
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----------------
John White
High Performance Computing Services (HPCS)
(510) 486-7307
One Cyclotron Rd, MS: 50B-3209C
Lawrence Berkeley National Lab
Berkeley, CA 94720








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