[Gluster-users] General questions

Cristian Del Carlo cristian.delcarlo at targetsolutions.it
Thu Jun 20 15:31:48 UTC 2019


thanks for your help.

I am planing to use libvirtd with plain KVM.

Ok i will use libgfapi.

I'm confused about the use of sharding is it useful in this configuration?
Doesn't sharding help limit the bandwidth in the event of a rebalancing?

In the vm setting so i need to use directsync to avoid corruption.

Thanks again,

Il giorno gio 20 giu 2019 alle ore 12:25 Strahil <hunter86_bg at yahoo.com> ha

> 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
> On Jun 20, 2019 13:12, Cristian Del Carlo <
> cristian.delcarlo at targetsolutions.it> wrote:
> 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*


*Cristian Del Carlo*

*Target Solutions s.r.l.*

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