[Gluster-users] The mysterious NUFA - help needed

[Hafeez Bana]

Thanks Ravi, that solves it.

Would it have helped if I had specified AAAHOST:nufa-r4  i.e. removed the
slash?

Asking because the documentation for nufa uses the words sub-volumes - and
as far as I understand a subvolume is a translator with a brick underneath.

Thx again.
hb


On Tue, Oct 15, 2013 at 1:34 PM, Ravishankar N <ravishankar at redhat.com>wrote:

>  On 10/15/2013 02:37 PM, Hafeez Bana wrote:
>
>    Hi All,
>
>  I've been playing with Gluster 3.4x - in particular the nufa
> configuration. All the setups are via the gluster CLI.
>
>  A simple nufa config across 2 machines with the subvolumes being bricks
> works without issue.
>
>  However anything more complex gives very strange behaviors. For instance
> the below config.
>
>  This volume is meant to have a replica set on each machine and then tied
> together into a nufa config.
>
>  I then mount nufa4 on BBBHOST and AAAHOST and simulate some writes. This
> works and the speeds seem to indicate the writes are happening locally.
>
>  However the strange thing is if you look into any of the brick dirs i.e.
> /DIR_ON_HOST/test004a/ - no files are present!
>
>  The volume continues to operate but I am baffled about
>  1) Where the files are being stored
>
> Hi hb,
> The brick path present in the volume info for 'nufa4' tells you where the
> files go. So
>
> Volume Name: nufa4
> .
> .
>
> .
> Brick1: AAAHOST:/nufa-r4
> Brick2: BBBHOST:/nufa-r4b
>
> means the files are created in the root file system, in the /nufa-r4 and
> /nufa-r4b directories of your hosts. I think you have misunderstood
> 'AAAHOST:/nufa-r4' and 'BBBHOST:/nufa-r4b' as referring to the 2 replica
> volumes that you have created. They are actually the brick paths.
>
>
>
>    2) Whether such a configuration is possible i.e  a nufa sitting on top
> of 2 replica systems (and in fact how nufa figures out which replica sit is
> on the local host).
>
>
> Nufa makes sense only on distributed volumes. Enabling nufa on a plain
> replicate volume has no effect- the files will be created on all bricks
> that constitute the replica.
> Thanks,
> Ravi
>
>    Any insight would be helpful.
>
> Thx.
> hb
>
>
> ----------------
> Volume Name: nufa-r4
> Type: Replicate
> Volume ID: d47ceecf-11be-49a3-8b27-9d1df61f588c
> Status: Started
> Number of Bricks: 1 x 2 = 2
> Transport-type: tcp
> Bricks:
> Brick1: AAAHOST:/DIR_ON_HOST_A/test004a
> Brick2: AAAHOST:/DIR_ON_HOST_A/test004b
>
> Volume Name: nufa-r4b
> Type: Replicate
> Volume ID: 98bc1402-fbd9-4637-81c2-2f24029d51bc
> Status: Started
> Number of Bricks: 1 x 2 = 2
> Transport-type: tcp
> Bricks:
> Brick1: BBBHOST:/DIR_ON_HOST_B/test004a
> Brick2: BBBHOST:/DIR_ON_HOST_B/test004b
>
> Volume Name: nufa4
> Type: Distribute
> Volume ID: 061a3359-ec92-4ab3-9305-bae783df0ec2
> Status: Started
> Number of Bricks: 2
> Transport-type: tcp
> Bricks:
> Brick1: AAAHOST:/nufa-r4
> Brick2: BBBHOST:/nufa-r4b
> Options Reconfigured:
> cluster.nufa: on
>
>
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>
>
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