Hi, 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 <[email protected]> ha scritto: > 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 < > [email protected]> 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.* *T* +39 0583 1905621 *F* +39 0583 1905675 *@* [email protected] http://www.targetsolutions.it P.IVA e C.Fiscale: 01815270465 Reg. Imp. di Lucca Capitale Sociale: €11.000,00 iv - REA n° 173227 Il testo e gli eventuali documenti trasmessi contengono informazioni riservate al destinatario indicato. La seguente e-mail e' confidenziale e la sua riservatezza e' tutelata legalmente dal Decreto Legislativo 196 del 30/06/2003 (Codice di tutela della privacy). La lettura, copia o altro uso non autorizzato o qualsiasi altra azione derivante dalla conoscenza di queste informazioni sono rigorosamente vietate. Qualora abbiate ricevuto questo documento per errore siete cortesemente pregati di darne immediata comunicazione al mittente e di provvedere, immediatamente, alla sua distruzione.
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