[Gluster-users] Arbiter and Hot Tier

[Ravishankar N]

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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