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Now that GlusterFS 3.4.0 is out, here are some mechanisms to upgrade from earlier installed versions of GlusterFS.
Upgrade from GlusterFS 3.3.x:
GlusterFS 3.4.0 is compatible with 3.3.x (yes, you read it right!). You can upgrade your deployment by following one of the two procedures below.
a) Scheduling a downtime (Recommended)
For this approach, schedule a downtime and prevent all your clients from accessing the servers.
You would need to repeat these 4 steps on all servers that form your trusted storage pool.
After upgrading the servers, it is recommended to upgrade all client installations to 3.4.0.
b) Rolling upgrades with no downtime
If you have replicated or distributed replicated volumes with bricks placed in the right fashion for redundancy, have no data to be self-healed and feel adventurous, you can perform a rolling upgrade through the following procedure:
Repeat the above steps on all servers that are part of your trusted storage pool.
Again after upgrading the servers, it is recommended to upgrade all client installations to 3.4.0.
Upgrade from GlusterFS 3.1.x and 3.2.x:
You can follow the procedure listed here and replace 3.3.0 with 3.4.0 in the procedure.
Please note that this may not work for all installations & upgrades. If you notice anything amiss and would like to see it covered here, please leave a comment and I will try to incorporate your findings.
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