[Gluster-users] Glusterfs upgrade to 3.5 without downtime

[Marco Marino]

Hi. I'm using glusterfs (replica 2) as a storage backend for openstack vm
instances (ephemeral disks). Each compute node mounts glusterfs in
/mnt/instances but i need to upgrade glusterfs from 3.4 to 3.5 (
http://www.gluster.org/community/documentation/index.php/Upgrade_to_3.5 ).
This guide tells me that a downtime is required, but in my case downtime
means:
1) shutoff all vm instances
2) umount glusterfs from all compute nodes
3) upgrade glusterfs
4) mount glusterfs from all compute nodes
5) restart all vm instances


Is there a solution without downtime (also using replication 2 factor)? I
do not want to shut off all instances....
Thanks.
MM
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