On 05/12/2016 05:35 AM, Bill Bill wrote:
Hello,
Let’s say I have a 5 node converged cluster of oVirt & glusterFS with
a replica count of “3”.
Host1 - replica
Host2 - replica
Host3 - replica
Host4
Host5
If I spin a VM up on Host1 – does the first replica get created local
to that server?
In the event I move the VM to another host, does the replica of the
disk follow the VM so essentially it’s writing to a local copy first
or does it “always” write across the network.
Any writes are written to all 3 hosts that form the replica 3 gluster
volume. Replica 3 - indicates that there is a 3-way copy of data, and
the same data resides on Host1, Host2 and Host3.
Reads however are from local host. So for a VM running on Host1, it will
access the data (i.e. read) from the brick on Host1.
For example, with VMware, the disk will follow the VM to the
hypervisor you move it to so that the writes are essentially “local”.
I have not been able to find anything on the internet or in the
documentation that specifies how this process works. Ideally, you
wouldn’t want a VM residing on Host1 that accesses its disk on Host3.
Multiple that by hundreds of VM’s and it would create a ton of
unnecessary network congestion.
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