Re: How to set up a 4 way gluster file system

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On Fri, Apr 27, 2018 at 10:56 AM, Thing <thing.thing@xxxxxxxxx> wrote:
Hi,

I have 4 servers each with 1TB of storage set as /dev/sdb1, I would like to set these up in a raid 10 which will? give me 2TB useable.  So Mirrored and concatenated? 

The command I am running is as per documents but I get a warning error,  how do I get this to proceed please as the documents do not say.

gluster volume create gv0 replica 2 glusterp1:/bricks/brick1/gv0 glusterp2:/bricks/brick1/gv0 glusterp3:/bricks/brick1/gv0 glusterp4:/bricks/brick1/gv0
Replica 2 volumes are prone to split-brain. Use Arbiter or Replica 3 to avoid this. See: http://docs.gluster.org/en/latest/Administrator%20Guide/Split%20brain%20and%20ways%20to%20deal%20with%20it/.
Do you still want to continue?
 (y/n) n


This is not an error. It is a recommendation and an explicit cautionary step to remind users of the problems using a replica 2.
It is advisable to use a replica 3 instead of a replica 2 to avoid split-brain conditions.

If you still insist on using a replica 2, you can go ahead and answer a 'y' to a the "Do you still want to continue ?" question.
 
Usage:
volume create <NEW-VOLNAME> [stripe <COUNT>] [replica <COUNT> [arbiter <COUNT>]] [disperse [<COUNT>]] [disperse-data <COUNT>] [redundancy <COUNT>] [transport <tcp|rdma|tcp,rdma>] <NEW-BRICK>?<vg_name>... [force]

[root@glustep1 ~]# 

thanks

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--
Milind

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