On Fri, Sep 23, 2016 at 7:09 PM, Davide Ferrari <[email protected]> wrote:
> > > 2016-09-23 13:50 GMT+02:00 Sahina Bose <[email protected]>: > > Ok, if I encounter again similiar problems I will post logs here > > >> >> If you have additional capacity on the other 3 hosts , then yes, you can >> create a new gluster volume with a brick on the newly added 4th node and >> bricks from other nodes - this volume can be used as another storage >> domain. You are not doing anything wrong :) Keep in mind that all gluster >> volumes used as data storage domains should be replica 3 or replica 3 >> -arbiter to avoid split-brain and data loss issues. >> >> > Mmmmh this is ringing an alarm bell then. So, it's basically impossible > (or at least not supported) a 4 hosts configuration with all the 4 hosts > having a data domain in a replica 2 fashion? Is it only replica 3 arbiter 1 > the supported HA configuration? So if I want to expand storage (a part from > adding disks to the same machines) I must add machines 3 by 3 ? > > Currently I have 4 machines with 4 disks each in a RAID-10 configuration, > exposed as one brick. Which is the best HA solution in this scenario then? > You could do this - where Node3 & Node 2 also has arbiter bricks. Arbiter bricks only store metadata and requires very low storage capacity compared to the data bricks. Node1 Node2 Node3 Node4 brick1 brick1 arb-brick arb-brick brick1 brick1 > Thanks > > -- > Davide Ferrari > Senior Systems Engineer >
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