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: [email protected] 
[mailto:[email protected]] On Behalf Of Roland Rabben
Sent: Sunday, December 06, 2009 6:29 PM
To: [email protected]
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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