[Gluster-users] Fwd: Glusterfs over wan?

[Count Zero]

Hi Shayn,

The problem is not replication speed. Actually that part is just fine, and it's quite fast.

The problem with WAN is that when the gluster client receives a request to read the file, it first checks with all the nodes in the cluster, to make sure there are no discrepancies. Only after all nodes have answered, it will read the local file (if it's replicated locally).

Also take into account that international links are not as reliable as local LAN based links. If a node is suddenly inaccessible, it can slow down everything (again because READ operations are dependent on all nodes in the cluster answering, synchronously).

I know that the gluster team are working on an async solution, down the road, which would make glusterfs more suitable for WAN scenarios.

My suggestion is NOT to try it, until the gluster team officially announce WAN support.



On May 27, 2010, at 4:31 PM, shayn at shayn.ch wrote:

> 
> Hello !
> 
> sorry for english, but, just don't understand why glusterfs is not
> destinated to be used over the wan ?
> I think that if the files are tiny, there's no problem to use this
> solution over wan.. ?
> 
> But okay, if file are large.. (don't know .. 100MB - 200MB and more.) i
> understand that it depend of the internet connection and that's the
> replication can be so soo soo slow..
> 
> Please, give me some renseignments about this solution over wan
> 
> Shayn_______________________________________________
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