Hi,
>>gluster volume create gv0 replica 2 glusterp1:/bricks/brick1/gv0 glusterp2:/bricks/brick1/gv0 glusterp3:/bricks/brick1/gv0 glusterp4:/bricks/brick1/gv0
This command will create a distributed-replicate volume(yes you have to opt 'y' at the warning message to get it created). We will have two distribution legs each containing a replica pair(made of two bricks). When a file is placed on the volume by a user, it will be placed in one of the distribution legs which as mentioned earlier will have only two copies. With replica 2 volumes(volume type: replicate /distributed-replicate) we might hit split-brain situation. So we recommend replica 3 or arbiter volume to provide consistency and availability.>>gluster volume create gv0 replica 2 glusterp1:/bricks/brick1/gv0 glusterp2:/bricks/brick1/gv0 glusterp3:/bricks/brick1/gv0 glusterp4:/bricks/brick1/gv0
Regards,
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Sunil kumar Acharya
Senior Software Engineer
On Fri, Apr 27, 2018 at 12:52 PM, Thing <thing.thing@xxxxxxxxx> wrote:
Hi,I have 4 nodes, so a quorum would be 3 of 4. The Q is I suppose why does the documentation give this command as an example without qualifying it?SO I am running the wrong command? I want a "raid10"On 27 April 2018 at 18:05, Karthik Subrahmanya <ksubrahm@xxxxxxxxxx> wrote:Hi,With replica 2 volumes one can easily end up in split-brains if there are frequent disconnects and high IOs going on.If you use replica 3 or arbiter volumes, it will guard you by using the quorum mechanism giving you both consistency and availability.But in replica 2 volumes, quorum does not make sense since it needs both the nodes up to guarantee consistency, which costs availability.If you can consider having a replica 3 or arbiter volumes it would be great. Otherwise you can anyway go ahead and continue with the replica 2 volumeby selecting *y* for the warning message. It will create the replica 2 configuration as you wanted.HTH,KarthikOn 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/gv0Replica 2 volumes are prone to split-brain. Use Arbiter or Replica 3 to avoid this. See: http://docs.gluster.org/en/latest/Administrator%20Guide/Spli .t%20brain%20and%20ways%20to%20 deal%20with%20it/ Do you still want to continue?(y/n) nUsage: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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