[Gluster-users] How to use gluster for WAN/Data Center replication

[Mohit Anchlia]

If you mentioned replica of 2 then I believe there will be only 2
writes not 4. My understanding is that for replica 2 if a file is
created on brick 1 then it will be replicated to brick 2. This makes
for replica 2.

Have you seen it otherwise?

On Fri, Mar 11, 2011 at 1:40 AM, anthony garnier <sokar6012 at hotmail.com> wrote:
> Hi,
> The GSLB+RR is especially usefull for nfs client in fact, for gluster
> client, it's just for volfile.
> The process to remove node entry from DNS is indeed manual, we are looking
> for a way to do it automaticaly, maybe with script....
> What do you mean by "How do you ensure that a copy of file in one site
> definitely is saved on other site as well?"
> Servers from replica1 and 2 are mixed between  the 2 datacenter,
> Replica pool 1 : Brick 1,2,3,4
> Replica pool 2 : Brick 5,6,7,8
>
> Datacenter 1 : Brick 1,2,5,6
> Datacenter 2 : Brick 3,4,7,8
>
> In this way, each Datacenter got 2 replica of the file. Each Datacenter
> could be independent if there is a Wan interruption.
>
> Regards,
> Anthony
>
>> Date: Thu, 10 Mar 2011 12:00:53 -0800
>> Subject: Re: How to use gluster for WAN/Data Center replication
>> From: mohitanchlia at gmail.com
>> To: sokar6012 at hotmail.com; gluster-users at gluster.org
>>
>> Thanks for the info! I am assuming it's a manual process to remove
>> nodes from the DNS?
>>
>> If I am not wrong I think load balancing by default occurs for native
>> gfs client that you are using. Initial mount is required only to read
>> volfile.
>>
>> How do you ensure that a copy of file in one site definitely is saved
>> on other site as well?
>>
>> On Thu, Mar 10, 2011 at 1:11 AM, anthony garnier <sokar6012 at hotmail.com>
>> wrote:
>> > Hi,
>> > I have done a setup(see my setup below) on multi site datacenter with
>> > gluster and currently it doesn't work properly but there is some
>> > workaround.
>> > The main problem is that replication is synchronous and there is
>> > currently
>> > no way to turn it in async mod. I've done some test
>> > (iozone,tar,bonnie++,script...) and performance
>> > is poor with small files especially. We are using an url to access
>> > servers :
>> > glusterfs.cluster.inetcompany.com
>> > This url is in DNS GSLB(geo DNS)+RR (Round Robin)
>> > It means that client from datacenter 1 will always be binded randomly on
>> > storage node from his Datacenter.
>> > They use this command for mounting the filesystem :
>> > mount -t glusterfs glusterfs.cluster.inetcompany.com:/venus
>> > /users/glusterfs_mnt
>> >
>> > If one node fails , it is remove from de list of the DNS, client do a
>> > new
>> > DNS query and he is binded on active node of his Datacenter.
>> > You could use Wan accelerator also.
>> >
>> > We currently are in intra site mode and we are waiting for Async
>> > replication
>> > feature expected in version 3.2. It should come soon.
>> >
>> >
>> > Volume Name: venus
>> > Type: Distributed-Replicate
>> > Status: Started
>> > Number of Bricks: 2 x 4 = 8
>> > Transport-type: tcp
>> > Bricks:
>> > Brick1: serv1:/users/exp1 \
>> > Brick2: serv2:/users/exp2 > Réplica pool 1 \
>> > Brick3: serv3:/users/exp3 / \
>> > Brick4: serv4:/users/exp4 =Envoyer>Distribution
>> > Brick5: serv5:/users/exp5 \ /
>> > Brick6: serv6:/users/exp6 > Réplica pool 2 /
>> > Brick7: serv7:/users/exp7 /
>> > Brick8: serv8:/users/exp8
>> >
>> > Datacenter 1 : Brick 1,2,5,6
>> > Datacenter 2 : Brick 3,4,7,8
>> > Distance between Datacenters : 500km
>> > Latency between Datacenters : 11ms
>> > Datarate between Datacenters : ~100Mb/s
>> >
>> >
>> >
>> > Regards,
>> > Anthony
>> >
>> >
>> >
>> >>Message: 3
>> >>Date: Wed, 9 Mar 2011 16:44:27 -0800
>> >>From: Mohit Anchlia <mohitanchlia at gmail.com>
>> >>Subject: [Gluster-users] How to use gluster for WAN/Data Center
>> >> replication
>> >>To: gluster-users at gluster.org
>> >>Message-ID:
>> >> <AANLkTi=dkK=zX0QdCfnKeLJ5nkF1dF3+g1hxDzFZNvwx at mail.gmail.com>
>> >>Content-Type: text/plain; charset=ISO-8859-1
>> >>
>> >>How to setup gluster for WAN/Data Center replication? Are there others
>> >>using it this way?
>> >>
>> >>Also, how to make the writes asynchronuous for data center replication?
>> >>
>> >>We have a requirement to replicate data to other data center as well.
>