[Gluster-users] Adding bricks to DHT

Vahriç Muhtaryan vahric at doruk.net.tr
Sun Dec 6 17:00:05 UTC 2009

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.


-----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

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.

Roland Rabben

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