[Gluster-users] Mirror volumes with odd number of servers

Thu Jul 29 05:36:42 UTC 2010

previously sent volume specification files were of a replicated setup of 3 servers. The ones attached with this mail are examples of a distributed-replicated setup of 5 servers.

regards,
----- Original Message -----
From: "Raghavendra G" <raghavendra at gluster.com>
To: "Gluster General Discussion List" <gluster-users at gluster.org>
Sent: Thursday, July 29, 2010 9:28:33 AM
Subject: Re: [Gluster-users] Mirror volumes with odd number of servers

Hi James,

Please find example volume specification files attached with this mail.

regards,
----- Original Message -----
From: "James Burnash" <jburnash at knight.com>
To: "Gluster General Discussion List" <gluster-users at gluster.org>
Sent: Wednesday, July 28, 2010 8:41:08 PM
Subject: Re: [Gluster-users] Mirror volumes with odd number of servers

Thanks Tejas.

If an actual example of the glusterfs.vol was available showing this setup was available, that would be a valuable sanity check against what I will build.

James Burnash, Unix Engineering
T. 201-239-2248 
jburnash at knight.com | www.knight.com

545 Washington Ave. | Jersey City, NJ

-----Original Message-----
From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Tejas N. Bhise
Sent: Wednesday, July 28, 2010 12:26 PM
To: Gluster General Discussion List
Subject: Re: [Gluster-users] Mirror volumes with odd number of servers

James,

You can do that, but you will have to hand craft the volume file. volgen looks for even numbers as you have already noticed.

With hand crafting of volume files, you can even have a replicate distribute .. so e.g. 2 copies of file, and each replicate node of the graph can have a differing number of distribute servers under it.

something like this can be done to have a replica count of two with 5 servers... 

         |      R1   |----------R1D1
mount--- |-----------|----------R1D2
         |
         |      R2   |-----------R2D1
         |-----------|-----------R2D2
                     |-----------R2D3

The design of translators is so modular that they can be used in any combination. This however used to lead to confusion and hence we developed volgen that produced easy to use and default best-fit configuration.

>From the perspective of "official" support, we typically only support configs that volgen produces. For other configs, we do fix the bugs, but how fast depends on the config  and translator seeing the bug.

Let me know if you have more questions about this.

Regards,
Tejas Bhise.

----- Original Message -----
From: "James Burnash" <jburnash at knight.com>
To: "Gluster General Discussion List" <gluster-users at gluster.org>
Sent: Wednesday, July 28, 2010 6:41:02 PM
Subject: Re: [Gluster-users] Mirror volumes with odd number of servers

Carl - could you possibly provide an example of a configuration using an odd number of servers? glusterfs-volgen is unhappy when you don't give an even number.

Thanks!

James Burnash, Unix Engineering
T. 201-239-2248
jburnash at knight.com | www.knight.com

545 Washington Ave. | Jersey City, NJ

-----Original Message-----
From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Craig Carl
Sent: Wednesday, July 28, 2010 12:16 AM
To: Gluster General Discussion List
Subject: Re: [Gluster-users] Mirror volumes with odd number of servers

Brock -
It is completely possible using Gluster File System. We haven't exposed that option via the Gluster Storage Platform GUI yet.

Craig

--
Craig Carl

Gluster, Inc.
Cell - (408) 829-9953 (California, USA)
Gtalk - craig.carl at gmail.com

From: "brock brown" <brownbm at u.washington.edu>
To: gluster-users at gluster.org
Sent: Tuesday, July 27, 2010 12:51:19 PM
Subject: [Gluster-users] Mirror volumes with odd number of servers

All the documentation refers to using multiples of 2 when setting up mirrored volumes. Also the Gluster Storage Platform will not allow it. Is this impossible and if so why?

Thanks,

Brock

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