[Gluster-users] Maintainance mode for bricks

[Tejas N. Bhise]

Thanks, Ian.

Fred - the method Ian describes, using self heal, is a good way of doing it 
while maintaining gluster semantics and not playing around directly with the
backend.

In a future release, with dynamic volume management, one would be able to do 
such things with simple commands with having the data online all the while. 

Regards,
Tejas.

----- Original Message -----
From: "Ian Rogers" <ian.rogers at contactclean.com>
To: gluster-users at gluster.org
Sent: Wednesday, April 14, 2010 8:43:19 PM
Subject: Re: [Gluster-users] Maintainance mode for bricks

On 14/04/2010 13:20, Fred Stober wrote:
> On Wednesday 14 April 2010, Tejas N. Bhise wrote:
>    
>> Fred,
>>
>> Would you like to tell us more about the use case ? Like why would you want
>> to do this ? If we take a brick out, it would not be possible to get it
>> back in ( with the existing data ).
>>      
> Ok, here is our use case:
> We have a small test system running on 3 file servers. cluster/distribute is
> used to give a flat view of the file servers. Now have the problem that one
> file server is going to be replaced with a larger one. Therefore we want to
> put the old file server into read only mode to rsync the files to the new
> server. Unfortunately this will take ~2days. During this time it would be
> nice to keep the glusterfs in read/write mode.
>
> If I understand it correctly, I should be able to use "lookup-unhashed" to
> reintegrate the new fileserver in the existing file system, when we switch
> off the old server.
>
> Cheers,
> Fred
>
>    

Could you use gluster to put the new server and old one into a 
cluster/replicate pair so it looks just like one server to the 
cluster/distribute above it? Then do rsync or let gluster copy 
everything across with a "self heal". When the new one is up to date 
just disable the old one and remove the cluster/replicate.

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