[Gluster-users] Arbiter and Hot Tier

[Walter Deignan]

Thank you very much for the assistance.

-Walter Deignan
-Uline IT, Systems Architect



From:   Ravishankar N <ravishankar at redhat.com>
To:     Walter Deignan <WDeignan at uline.com>
Cc:     gluster-users at gluster.org
Date:   05/05/2017 11:43 AM
Subject:        Re: [Gluster-users] Arbiter and Hot Tier



Okay, just tried it in 3.9  Even though attaching a non arbiter volume 
(say a replica-2 ) as hot-tier is succeeding at the CLI level, the brick 
volfiles seem to be generated incorrectly (I see that the arbiter 
translator is getting loaded in one of the replica-2 bricks too, which is 
incorrect). I'd recommend not to use arbiter for tiering irrespective of 
hot or cold tier.

 
On 05/05/2017 09:42 PM, Walter Deignan wrote:
Did that change between 3.9 and 3.10? When I originally saw some 
references on the Redhat storage packaged solution about a possible 
incompatibility I assumed it just meant that the hot tier itself couldn't 
be an arbiter volume. 

I was tripped up by the change in apparent support for the cold tier 
between 3.9 and 3.10. But maybe that was just a fixed oversight which 
never should have worked in the first place? 

-Walter Deignan
-Uline IT, Systems Architect 



From:        Ravishankar N <ravishankar at redhat.com> 
To:        Walter Deignan <WDeignan at uline.com>, gluster-users at gluster.org 
Date:        05/05/2017 11:08 AM 
Subject:        Re: [Gluster-users] Arbiter and Hot Tier 



Hi Walter,
Yes, arbiter volumes are currently not supported with tiering.
-Ravi

On 05/05/2017 08:54 PM, Walter Deignan wrote: 
I've been googling this to no avail so apologies if this is explained 
somewhere I missed. 

Is there a known incompatibility between using arbiters and hot tiering? 

Experience on 3.9 

Original volume - replica 3 arbiter 1 
Attach replica 2 arbiter 1 hot tier - failure 
Attach replica 3 hot tier - success 

Experience on 3.10 

Original volume - replica 3 arbiter 1 
Attach replica 2 arbiter 1 hot tier - failure 
Attach replica 3 hot tier - failure 
Attach hot tier without specifying replica - success but comes in as a 
distributed tier which I would assume totally negates the point of having 
a replicated cold tier? 

The specific error message I get is "volume attach-tier: failed: 
Increasing replica count for arbiter volumes is not supported." 

-Walter Deignan
-Uline IT, Systems Architect 

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