[Gluster-devel] combining AFR and cluster/unify

[Pooya Woodcock]

Hi Krishna,

I'll clarify a bit by saying the main purpose of having cluster/unify  
plus AFR is to have an expandable grid file system but have  
redundancy on it too. I don't mind having to restart the daemons or  
remount the glusterfs volume.

I have the funds to build a 20 node glusterfs cluster and I was  
thinking that 20 machines each with 2x750Gig SATA drives in cluster/ 
unify would yield around 25-30 or so TB of storage. An EMC san of  
comparable size will cost us way more than this grid. If you add the  
AFR portion, and say replicate *:4 , that's like saying you can take  
down 3 servers and still be guaranteed to have a node in the cluster  
with the file you're looking for.

Please let me know if I'm wrong, and with that in mind, can you  
provide an example of how to do this on a cluster of 4 servers to  
start ?

Thanks, and awesome project!
Pooya

On Mar 11, 2007, at 1:24 PM, Krishna Srinivas wrote:

> Pooya,
>
> If you change the client.vol you have to restart the glusterfs.
> If you change the server.vol you have to restart the glusterfsd.
>
> It is possible not to restart glusterfs but still grow the  
> glusterfs volume.
> i.e by using an extra glusterfsd which does unify which communicates
> with the glusterfs. you can change the configs for this glusterfsd
> and restart it. However glusterfs will not work properly till you  
> start
> this glusterfsd process, but you dont have to restart the glusterfs  
> process.
>
> Let me know if I need to explain by example.
>
> Krishna
>
> On 3/10/07, Pooya Woodcock <pooya at packetcloud.net> wrote:
>>
>> I just had a chance to experiment with GlusterFS this evening and one
>> question came up. I am wondering if it is possible to combine types
>> cluster/unify and AFR such that you have a mounted glusterfs volume
>> that grows in size and also has *:2 on its files, for example.
>>
>> Thanks,
>>
>> Pooya
>>
>>
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