Hi,
Are you planing to use oVirt or plain KVM or openstack?
I would recommend you to use gluster v6.1 as it is the latest stable version and will have longer support than the older versions.
Fuse vs libgfapi - use the latter as it has better performance and less overhead on the host.oVirt does supports both libgfapi and fuse.
Also, use replica 3 because you will have better read performance compared to replica 2 arbiter 1.
Sharding is a tradeoff between CPU (when there is no sharding , gluster shd must calculate the offset of the VM disk) and bandwidth (whole shard is being replicated despite even 512 need to be synced).
If you will do live migration - you do not want to cache in order to avoid corruption.
Thus oVirt is using direct I/O.
Still, you can check the gluster settings mentioned in Red Hat documentation for Virt/openStack .
Best Regards,
Strahil Nikolov
Hi,
I'm testing glusterfs before using it in production, it should be used to store vm for nodes with libvirtd.In production I will have 4 nodes connected with a dedicated 20gbit/s network.Which version to use in production on a centos 7.x? Should I use Gluster version 6?To make the volume available to libvirtd the best method is to use FUSE?I see that stripped is deprecated. Is it reasonable to use the volume with 3 replicas on 4 nodes and sharding enabled?Is there convenience to use sharding volume in this context? I think could positive inpact in read performance or rebalance. Is it true?In the vm configuration I use the virtio disk. How is it better to set the disk cache to get the best performances none, default or writeback?
Thanks in advance for your patience and answers.Thanks,Cristian Del Carlo
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