On Nov 7, 2019 15:29, Christian Reiss <[email protected]> wrote: > > Hey folks, > > I am looking at setting up a hyperconverged cluster with 3 nodes (and > oVirt 4.3). Before setting up I have some generic questions that I would > love to get hints or even an answer on. > > First off, the Servers are outfittet with 24 (SSD) drives each in a > HW-RAID. Due to wear-leveling and speed I am looking at RAID10. So I > would end up with one giant sda device.
Go with RAID 0 , or RAID5/6 as you will have the same data on all nodes (3 copies in total) . > a) Partitioning > Using oVirt node installer which will use the full size of /dev/sda is > this still the right solution to Hyperconverged given the gluster issue? > If I understood it correctly gluster is using empty drives or partitions > so a fully utilized drive is of no use here. Does oVirt node installer > have a hyperconverged/ gluster mode? The cockpit installer can prepare the gluster infrastructure and then the oVirt cluster > b) Storage Location > In this 3 node cluster, creating a VM on node01 will the data for node01 > always end up in the local node01 server? Nope , all data is replicated on all 3 nodes (or on 2 nodes when using 'replica 2 arbiter1' volumes). > c) Starting VMs > Can a VM be migrated or launched from node03 if the data resides on > node01 and node02 (copies 2 with arbiter). As gluster is a shared storage, the VMs can migrate on any host that has access to the storage (in your case any of the 3 nodes). > d) Efficiency / High IO Load > If node01 has high IO Load would additional data be loaded from the > other node which has the copy to even the load? I am aware Virtuozzo > does this. Gluster Clients (in this case oVirt node) reads from all 3 nodes simultaneously for better I/O. Same is valid for writes. > e) Storage Network dies > What would happen with node01, node02 and node03 are operational but > only the storage network dies (frontend is still alive as are the nodes). Nodes will become unoperational and all VMs will be paused until storage is restored. > f) external isci/ FreeNAS > We have a FreeNAS system with tons of space and fast network > connectivity. Can oVirt handle storage import like remote iscsi target > and run VMs on the ovirt nodes but store data there? Yep. > Thank you for your time to clear this up. > I have found many approaches out there that either are old (oVirt 3) or > even contradict themselves (talk about RAID level...) > > Cheers! > -Christian _______________________________________________ Users mailing list -- [email protected] To unsubscribe send an email to [email protected] Privacy Statement: https://www.ovirt.org/site/privacy-policy/ oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/[email protected]/message/PHGRD7SXINKIQ22TYD2QC4K7AJLC7O6Z/
