Re: 2 Replicas on 3 servers

[Joe Julian <joe@xxxxxxxxxxxxxxxx>]

No. Your brick count must be a multiple of your replica count. 

In the case of replica 2 volumes, each pair of bricks, in the order defined at volume creation, make a replicated subvolume to the distribute translator.

Chris Clarke <cclarke@xxxxxxxxxxxx> wrote:

Hi,

I've seen the other post recently on 3 servers and 2 replicas, but it doesn't answer the essential point of whether you can have a replica of 2 with 3 servers if those servers have 1 brick on each server.  

I'm looking to replicate the behaviour of an IBM GPFS filesystem, where I have a 3 node cluster with a replication factor of 2.  As GPFS is block based, then each block of data is stored on two of the 3 servers, i.e. block 1 may be on server 1 and 3, block 2 may be on server 1 and 2, block 3 may be on 2 and 3...

Is it possible to do a similar thing with Gluster?  I'd also love it to be possible to extend the filesystem by adding extra servers and being able to rebalance the file's distribution across them, but keeping the replication factor of 2, so I can always stand the loss of a single node without data loss.

Is any of this achievable?

Thanks

Chris

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