[ovirt-users] two node replicated gluster
Vijay Bellur
vbellur at redhat.com
Thu Sep 25 12:38:45 EDT 2014
On 09/25/2014 07:44 PM, ml ml wrote:
> Hello List,
>
> i have a Two Node replicated Gluster.
>
> I am running about 15 vm on each host so that in case one node fails
> the other one can take over.
>
> My question is how the GlusterFS self-healing-daemon works.
>
> I disconnected the two nodes on purpose and reconnected them again. So
> that the self-heal-daemon jumps it.
>
> It looks like it would transfer all the file. Does the
> self-heal-deamon of glusterfs not just copy the missing increments?
>
self-heal daemon just syncs regions of files that need to be updated and
the process of identification of regions to be updated involves
comparison of a rolling checksum of various regions in the files. You
can find more details about Gluster's replication and the self-healing
algorithm in the "Recovering from failures (Self-heal)" section of this
document [1].
-Vijay
[1] https://github.com/gluster/glusterfs/blob/master/doc/features/afr-v1.md
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