[Gluster-users] Adding bricks to DHT

[Deyan Chepishev]

Hello Roland,

I think you should consider the DHT option: lookup-unhashed

http://gluster.com/community/documentation/index.php/Translators/cluster/distribute


Please let us know if this does the job

Regards,
Deian

Roland Rabben wrote:
> My problem is that I can't change directory names without a lot of hassle.
> We have a hashed directory structure in our application that we rely on
> GlusterFS to store.
>
> Is there a way of copying files behind GlusterFS' back and have GlusterFS
> pick up on the change with a self heal?
>
> It seems that a system designed for scalability should tolerate eh... being
> scaled...?
>
> Regards
> Roland
>
> 2009/12/6 Vahriç Muhtaryan <vahric at doruk.net.tr>
>
>   
>> One idea , docs said that you should create new directory. Could you create
>> a new directory after add another server and copy files from old directory
>> to new one, then everything will be distributed.
>>
>> I know that glusterfs do not have reallocation mechanism for distribute
>> data to new added bricks for achive performance and capcity problem.
>>
>>
>> *Now the question is what about adding a new server?
>>
>> Currently hash works based on directory level distribution. i.e, a given
>> file's parent directory will have information of how the hash numbers are
>> mapped to subvolumes. So, adding new node doesn't disturb any current setup
>> as the files/dirs present already have its information preserved. Whatever
>> new directory gets created, will start considering new volume for scheduling
>> files.
>>
>> Regards
>> Vahric
>>
>> -----Original Message-----
>> From: gluster-users-bounces at gluster.org [mailto:
>> gluster-users-bounces at gluster.org] On Behalf Of Roland Rabben
>> Sent: Sunday, December 06, 2009 6:29 PM
>> To: gluster-users at gluster.org
>> Subject: [Gluster-users] Adding bricks to DHT
>>
>> Hi
>> I have a GlusterFS DHT system that I need to expand in a few days. Reading
>> up on the documentation it seems to me that adding bricks won't solve our
>> problem because of how the hash works.
>> I have a fairly static folder structure, but the number of files are
>> growing fast. From what I understand, adding bricks will not allow new files
>> to be stored on the new bricks unless they are stored in new directories.
>>
>> So my questions are:
>> 1. How can I make sure the new bricks are used?
>> 2. Is there a way to "rebalance" content over the new and old bricks?
>>
>> I can't tolerate much downtime on my FS.
>>
>> I am using GlusterFS 2.06.
>>
>> Regards
>> Roland Rabben
>>
>>
>>     
>
>
>   
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