[Gluster-users] Fwd: Glusterfs over wan?

[Michiel van Es]

You can do it but performance wise I would wait for the newer versions..

Michiel

-------- Original Message --------
Subject: Re: [Gluster-users] Fwd: Glusterfs over wan?
From: shayn at shayn.ch
To: Patricio A. Bruna <pbruna at it-linux.cl>, Tejas N. Bhise 
<tejas at gluster.com>
Date: 05/28/2010 11:13 AM

> Thanks for explain..
>
> So, you think, that with glusterfs, we can't have a replication between
> two (or more) different site over the wan, when both site are active
> (read and write functions) ?
>
> On 27 mai 10 20:07 "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.
>> <http://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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