[Lustre-discuss] MGS failover

[Brock Palen]

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Thank you, I was only looking at the mkfs.lustre didn't think the  
hosts are the ones that need to look there, not mgs filesystem its self.

does the mgsspec also work for --mgsnode=  when creating a file system?

mkfs.lustre ....  --mgsnodes=mds1 at tcp0:mds2 at tcp0

Would that be valid?

Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
brockp at umich.edu
(734)936-1985



On Jul 30, 2008, at 10:29 AM, Brian J. Murrell wrote:
> On Wed, 2008-07-30 at 09:48 -0400, Brock Palen wrote:
>> The manual does not make much sense when it comes to MGS failover.
>>
>> Manual:
>>
>> Note – The MGS does not use the --failnode option.
>
> This is true.
>
>> You need to set the
>> command on all other nodes of the filesystem (servers and clients),
>> about the
>> failover options for the MGS.
>
> This is true also.
>
>> Use the --mgsnode parameter on servers
>> and mount
>> address for clients.
>
> Also true.
>
>> The servers need to contact the MGS for
>> configuration
>> information;
>
> Also true.
>
>> they cannot query the MGS about the failover partner.
>
> This part is either unclear or wrong.  I guess the question is what  
> the
> writer was referring to as "they".  You could file a bug about that.
>
>> This does not make any sense at all, other than you can't use --
>> failnode
>
> On the MGS, yes.  On servers, yes you can use that option.
>
>> and that clients can't check with two different hosts for
>> MGS data.
>
> They sure can!  That's what the "<mgsspec>:=<mgsnode>[:<mgsnode>]"
> syntax in the mount.lustre manpage is all about.
>
>> Our MGS will be on its own LUN setup with heartbeat
>> between two nodes that are also working as an MDS pair.
>
> Good.
>
>> While
>> Heartbeat takes care of mounting the MGS file system, how can we tell
>> clients "if mds1 is down use mds2 for MGS data"
>
> $ man mount.lustre
>
> Check out mgsspec in the OPTIONS section.
>
> b.
>
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