Re: [Gluster-devel] Hello... stripping and fault tolerant systems...

[Krishna Srinivas]

Victor,

Yes, You can use stripe and afr, preferably stripe over a bunch of AFRs.

Krishna

On Wed, May 28, 2008 at 9:29 PM, Kevan Benson <address@hidden> wrote:
> Victor San Pedro wrote:
>>
>> Hello. I would like to ask you the following question:
>>
>> Is it possible to use cluster STRIPING to build a fault tolerant system?
>>
>> For example:
>>
>> If I have 6 storage servers
>> I would like to storage my files, all have a big size,  splited in the 6
>> servers ( I think I can achieve that with the striping cluster)
>> The goal would be to build a fault tolerant system with this striping
>> cluster with 6 servers...
>>
>> In the case a server fail, I could still access to all my files...
>> Could I managed this aim joining STRIPING with AFR? It is possible to do
>> that with clusterfs (it seems not to be model spec files of it)?
>>
>> How could I managed this aim? Any ideas?
>> What is your opinion about other possible ways of managing a fault
>> tolerant system using as less space as possible with glusterfs?
>
> If you export two volumes per server, and chain your AFR subvolumes between
> servers, you should get a fault tolerant system of the type you are looking
> for.
>
> Something like this:
>
> Brick X exports two volumes, brickX-1 and brickX-2
>
> UNIFY {
>  AFR1 { brick1-2, brick2-1 }
>  AFR2 { brick2-2, brick3-1 }
>  AFR3 { brick3-2, brick4-1 }
>  AFR4 { brick4-2, brick5-1 }
>  AFR5 { brick5-2, brick6-1 }
>  AFR6 { brick6-2, brick1-1 }
> }
>
> If you wanted MORE redundancy, you could export three volumes per server,
> and make you AFR's like this:
> UNIFY {
>  AFR1 { brick1-3, brick2-2, brick3-1 }
>  AFR2 { brick2-3, brick3-2, brick4-1 }
> ...
>
> Which would be able to survive two server failures without data loss.
>
> --
>
> -Kevan Benson
> -A-1 Networks
>
>
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