[Gluster-users] The mysterious NUFA - help needed

[Ravishankar N]

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
>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://supercolony.gluster.org/mailman/listinfo/gluster-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20131015/2447bf2b/attachment.html>