[Gluster-users] Fwd: Glusterfs over wan?

[Jeffrey Negro]

I'm looking forward to this feature.  I'm planning on having 2 clusters - a
primary and a DR.  I would like to be able to replicate data from the
production cluster to the DR, but would also like to see two way replication
so that when I eventually implement BGP in a dual homed scenario I could
have two independent systems replicating back and forth.


Jeffrey Negro, Network Engineer
Billtrust - Improving Your Billing, Improving Your Business
www.billtrust.com
609.235.1010 x137



On Thu, May 27, 2010 at 2:07 PM, Tejas N. Bhise <tejas at gluster.com> wrote:

> Patricio,
>
> All networked filesystems like nfs, cifs/samba and even GlusterFS can be
> used over WAN. The problem arises for the more complex functionality, like
> replication across a WAN.
>
> Replication over WAN has different meanings for different users - some just
> want a good way to have a remote backup, others want a hot-cold kind of a
> backup so namespace issue come into the picture, but its relatively easier
> to solve as there is only one side active at a time.
>
> The most difficult one is to keep both sites active ( and R/W ) with their
> own full namespace and security functionality with a designated unit of the
> filesystem replicated. Access from each side looks like it just pulled data
> from its own data cache and the currency of data could move around (
> potentially ) multiple locations across the globe.
>
> I don't think anyone does that last kind of replication. AFS and DFS from
> the old days did go upto a certain point by providing R/O replication with
> remote snapshots by providing integrated multisite security and namespace,
> but no R/W replication.
>
> GlusterFS plan is to start with async WAN replication for remote backup and
> slowly moving into the multisite cluster architecture and active active
> replicated data copies with integrated namespace, which we hope to bring in
> with a new unified ( write ) caching.
>
> Async WAN replication for remote backup might come in as early as end of
> the year with the other functionality following sometime after that.
>
> I would like to hear more about how community users will put these
> different levels of WAN replication to use, how much data would change on a
> daily basis and hence get moved around, what kind of latency would be
> acceptable to your applications ? I would also like to hear if anyone is
> using other solutions/edge caching appliances etc to do this in other ways.
>
> Regards,
> Tejas.
>
> ----- Original Message -----
> From: "Patricio A. Bruna" <pbruna at it-linux.cl>
> To: gluster-users at gluster.org
> Sent: Thursday, May 27, 2010 10:00:12 PM
> Subject: Re: [Gluster-users] Fwd: Glusterfs over wan?
>
> Hi,
> just for information, what file system are available to use over WAN?
>
>
> ------------------------------------
> Patricio Bruna V.
> IT Linux Ltda.
> www.it-linux.cl
> Fono : (+56-2) 333 0578
> Móvil: (+56-9) 7776 2899
>
>
>
>
>
>
>
>
> 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_______________________________________________
> > Gluster-users mailing list
> > Gluster-users at gluster.org
> > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
>
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