[Gluster-users] Replicated volume read request are served by remote brick

[Vlad Kopylov]

I was trying to use
http://lists.gluster.org/pipermail/gluster-users/2015-June/022322.html
as an example and it never worked
Neither did gluster volume set <VOLNAME> cluster.nufa enable on
with
   cluster.choose-local: on
   cluster.nufa: on
It still reads data from network bricks.

Was thinking to block inter-server network access for reading somehow, but
seemed too suicidal.

Suggestions welcome.

On Wed, Apr 18, 2018 at 4:32 PM, Frederik Banke <info at patch.dk> wrote:

> I have created a 2 brick replicated volume.
>
> gluster> volume status
> Status of volume: storage
> Gluster process                             TCP Port  RDMA Port  Online
> Pid
> ------------------------------------------------------------
> ------------------
> Brick master:/glusterfs/bricks/storage/mountpoint
>               49153     0          Y       5301
> Brick worker1:/glusterfs/bricks/storage/mountpoint
>              49153     0          Y       3002
>
> The volume is mounted like this:
> On worker1 node /etc/fstab
> worker1:/storage      /data/storage/       glusterfs     defaults,_netdev
> 0  0
>
> On master node /etc/fstab
> master:/storage      /data/storage/       glusterfs     defaults,_netdev
> 0  0
>
> When I add read load(many small files) on the volume mounted on the master
> node CPU usage looks like this:
> On master node: glusterfs ~ 50%
> On master node: glusterfsd ~ 25%
>
> On worker1 node: glusterfsd ~ 50%
>
> There is no other load on the servers than the read load I start.
> When I inspect the glusterfsd process on worker1 using strace, it seems
> like it does at least some of the file reading from this node.
>
> Is this expected behavior? I would think that since it is a replicated
> volume and read load, it would serve all the requests from the brick on the
> localhost and not use the network to serve the requests.
>
> Can anyone help to clarify my understanding of the architecture?
>
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>
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