[Gluster-users] geo-replication

[Marcus Pedersén]

Hi again,
I made some more tests and the behavior I get is that if any of
the slaves are down the geo-replication stops working.
It this the way distributed volumes work, if one server goes down
the entire system stops to work?
The servers that are online do not continue to work?

Sorry, for asking stupid questions.

Best regards
Marcus


On Tue, Feb 06, 2018 at 12:09:40PM +0100, Marcus Pedersén wrote:
> Hi all,
> 
> I am planning my new gluster system and tested things out in
> a bunch of virtual machines.
> I need a bit of help to understand how geo-replication behaves.
> 
> I have a master gluster cluster replica 2
> (in production I will use an arbiter and replicatied/distributed)
> and the geo cluster is distributed with 2 machines.
> (in production I will have the geo cluster distributed)
> 
> Everything is up and running and creating files from client both
> replicates and is distributed in the geo cluster.
> 
> The thing I am wondering about is:
> When I run: gluster volume geo-replication status
> I see both slave nodes one is active and the other is passive.
> 
> MASTER NODE    MASTER VOL     MASTER BRICK    SLAVE USER    SLAVE                                          SLAVE NODE      STATUS     CRAWL STATUS       LAST_SYNCED                  
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> gluster1       interbullfs    /interbullfs    geouser       ssh://geouser@gluster-geo1::interbullfs-geo    gluster-geo2    Active     Changelog Crawl    2018-02-06 11:46:08          
> gluster2       interbullfs    /interbullfs    geouser       ssh://geouser@gluster-geo1::interbullfs-geo    gluster-geo1    Passive    N/A                N/A
> 
> 
> If I shutdown the active slave the status changes to faulty
> and the other one continues to be passive.
> 
> MASTER NODE    MASTER VOL     MASTER BRICK    SLAVE USER    SLAVE                                          SLAVE NODE      STATUS     CRAWL STATUS    LAST_SYNCED          
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
> gluster1       interbullfs    /interbullfs    geouser       ssh://geouser@gluster-geo1::interbullfs-geo    N/A             Faulty     N/A             N/A                  
> gluster2       interbullfs    /interbullfs    geouser       ssh://geouser@gluster-geo1::interbullfs-geo    gluster-geo1    Passive    N/A             N/A
> 
> 
> In my understanding I thought that if the active slave stopped
> working the passive slave should become active and should
> continue to replicate from master.
> 
> Am I wrong? Is there just one active slave if it is setup as
> a distributed system?
> 
> What I use:
> Centos 7, gluster 3.12
> I have followed the geo instructions:
> http://docs.gluster.org/en/latest/Administrator%20Guide/Geo%20Replication/
> 
> Many thanks in advance!
> 
> Bets regards
> Marcus
> 
> -- 
> **************************************************
> * Marcus Pedersén                                * 
> * System administrator                           *
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-- 
**************************************************
* Marcus Pedersén                                * 
* System administrator                           *
**************************************************
* Interbull Centre                               *
* ================                               *
* Department of Animal Breeding & Genetics — SLU *
* Box 7023, SE-750 07                            *
* Uppsala, Sweden                                *
**************************************************
* Visiting address:                              *
* Room 55614, Ulls väg 26, Ultuna                *
* Uppsala                                        *
* Sweden                                         *
*                                                *
* Tel: +46-(0)18-67 1962                         *
*                                                *
**************************************************
*     ISO 9001 Bureau Veritas No SE004561-1      *
**************************************************