Gluster users - Nov 2024 - Add an arbiter when have multiple bricks at same server.

Hi there.

In previous emails, I comment with you guys, about 2 node gluster server,
where the bricks lay down in different size and folders in the same server,
like

gluster vol create VMS replica 2 gluster1:/disco2TB-0/vms
gluster2:/disco2TB-0/vms gluster1:/disco1TB-0/vms gluster2:/disco1TB-0/vms
gluster1:/disco1TB-1/vms gluster2:/disco1TB-1/vms

So I went ahead and installed a Debian 12 and installed the same gluster
version that the other servers, which is now 11.1 or something like that.
In this new server, I have a small disk like 480G in size.
And I created 3 partitions formatted with XFS using imaxpct=75, as
suggested in previous emails.

And than in the gluster nodes, I tried to add the brick
gluster vol add-brick VMS replica 3 arbiter 1 arbiter:/arbiter1/arbiter1
arbiter:/arbiter2/arbiter2 arbiter:/arbiter3/arbiter3

But to my surprise (or not!) I got this message:
volume add-brick: failed: Multiple bricks of a replicate volume are present
on the same server. This setup is not optimal. Bricks should be on
different nodes to have best fault tolerant co
nfiguration. Use 'force' at the end of the command if you want to
override
this behavior.

Why is that?






---


Gilberto Nunes Ferreira
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Your add-brick command adds 2 bricks 1 arbiter (even though you name
them all arbiter!)

The sequence is important:

gluster v add-brick VMS replica 2 arbiter 1 gluster1:/gv0 gluster2:/gv0
arbiter1:/arb1

adds two data bricks and a corresponding arbiter from 3 different
servers and 3 different disks,?
thus you can loose any one server OR any one disk and stay up and
consistent.

adding more bricks to the volume you can follow the pattern.

A.

Am Dienstag, dem 05.11.2024 um 12:51 -0300 schrieb Gilberto
Ferreira:
> Hi there.
> 
> In previous emails, I comment with you guys, about 2 node gluster
> server, where the bricks lay down in different size and folders in
> the same server, like
> 
> gluster vol create VMS replica 2 gluster1:/disco2TB-0/vms
> gluster2:/disco2TB-0/vms gluster1:/disco1TB-0/vms gluster2:/disco1TB-
> 0/vms gluster1:/disco1TB-1/vms gluster2:/disco1TB-1/vms
> 
> So I went ahead and installed a Debian 12 and installed the same
> gluster version that the other servers, which is now 11.1 or
> something like that.
> In this new server, I have a small disk like 480G in size.
> And I created 3 partitions?formatted?with XFS using?imaxpct=75, as
> suggested in previous emails.
> 
> And than in the gluster nodes, I tried to add the brick
> gluster vol add-brick VMS replica 3 arbiter 1
> arbiter:/arbiter1/arbiter1 arbiter:/arbiter2/arbiter2
> arbiter:/arbiter3/arbiter3
> 
> But to my surprise (or not!) I got this message:
> volume add-brick: failed: Multiple bricks of a replicate volume are
> present on the same server. This setup is not optimal. Bricks should
> be on different nodes to have best fault tolerant co
> nfiguration. Use 'force' at the end of the command if you want to
> override this behavior. 
> 
> Why is that?
> 
> ?
> 
> 
> 
> 
> ---
> 
> 
> Gilberto Nunes Ferreira
> 
> 
> 
> 
> ________
> 
> 
> 
> Community Meeting Calendar:
> 
> Schedule -
> Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
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> Gluster-users at gluster.org
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