ovirt Storage Domain Cluster Filesystem?
Hi all I come from Oracle VM x86 world and we are planning from moving Oracle VM to oVirt. I am having hard time understanding Storage Domains in oVirt. All our storage are SAN and I wonder how can we manage SAN LUN in oVirt to create a storage domain such that the VM guests can run in any host in the oVirt Cluster? For example in Oracle VM the Storage Repository (it is the Storage Domain in OVM words) are based on SAN LUNs and on top of that a cluster filesystem is created so all hosts in the cluster have concurrent access to the storage repository and the VM guest can be started in any of the hosts in the cluster. How do we accomplish the same in oVirt with SAN Storage? Which Cluster Filesystem is supported in Storage Domain? Or perhaps in oVirt the mechanism is totally different? Thank you
Hi! We use oVirt with FC SAN in our environment. Basically you just make LUN in SAN and attach that to the Storage domain. oVirt uses LVM on top of that storage for VM's and this happens automatically. All nodes where the LUN is seen can use the storage. You can also add multiple LUNs in one storage domain. Be careful with this. If you have different types of backing store for LUNs things get interesting if you mix them in the same storage domain. I mean you don't know if VM is running on SSD, HD or partly on both (depends how LVM fills the space). And as far as I know you can't remove LUN from the domain. I made this mistake once when I added SSD LUN to the oVirt. I had to make a new storage domain to where I transferred the VM's and cleaned up the mistake after that. Lastly I created a new storage domain for SSD and added the LUN there. I suggest that you just try this. It's easier than you think. -Juhani On Thu, Oct 22, 2020 at 9:38 AM <lsc.oraes@gmail.com> wrote:
Hi all
I come from Oracle VM x86 world and we are planning from moving Oracle VM to oVirt.
I am having hard time understanding Storage Domains in oVirt. All our storage are SAN and I wonder how can we manage SAN LUN in oVirt to create a storage domain such that the VM guests can run in any host in the oVirt Cluster?
For example in Oracle VM the Storage Repository (it is the Storage Domain in OVM words) are based on SAN LUNs and on top of that a cluster filesystem is created so all hosts in the cluster have concurrent access to the storage repository and the VM guest can be started in any of the hosts in the cluster.
How do we accomplish the same in oVirt with SAN Storage? Which Cluster Filesystem is supported in Storage Domain?
Or perhaps in oVirt the mechanism is totally different?
Thank you _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-leave@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/XMXDRNDT6BJ63F...
Hi Thanks for the reply. So LVM is used in ovirt, I guess only in a host ca the LVM moount point monted in a host becaise it is not a clustered LVM correct? In other words and for example if I have a LVM with this setup in ovirt and 2 KVM hosts: Hosts kvm1 and kvm2 Volume Group vg_vm Logical Volume lv-vm1 and lv-vm2 vg_vm/lv-vm1 is mounted in kvm1 with XFS and vg_vm/lv-vm2 mounted in kvm2 with XFS, when kvm1 is stopped vg_vm/lv-vm1 can be mounted in kvm2. Am I correct? Thank you
Hi! Someone can tell you more about technical details with SPM and other cool stuff which does the clustering but basically all disks are usable on all nodes simultaneously. So different VM's from node1 and node2 can use the same storage domain. This also enables live migration and storage migration between domains. That's why I suggested that you try it. You'll see that it works out of the box pretty well. It is the Gluster which seems to make life much more interesting. With SAN things are much more boring. -Juhani On Thu, Oct 22, 2020 at 2:54 PM <lsc.oraes@gmail.com> wrote:
Hi
Thanks for the reply.
So LVM is used in ovirt, I guess only in a host ca the LVM moount point monted in a host becaise it is not a clustered LVM correct? In other words and for example if I have a LVM with this setup in ovirt and 2 KVM hosts:
Hosts kvm1 and kvm2 Volume Group vg_vm Logical Volume lv-vm1 and lv-vm2
vg_vm/lv-vm1 is mounted in kvm1 with XFS and vg_vm/lv-vm2 mounted in kvm2 with XFS, when kvm1 is stopped vg_vm/lv-vm1 can be mounted in kvm2.
Am I correct?
Thank you _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-leave@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/SFBQNEZ6PF3EDS...
-- Juhani Rautiainen jrauti@iki.fi
ok! Thanks Juhani, I will proceed and explorer more this area in oVirt :-) Thank you
I just noticed there were many typos, old keyboard! let me fix Hi Thanks for the reply. So LVM is used in ovirt, I guess only a host can use the LVM mount point because it is not a clustered LVM correct? In other words and for example if I have a LVM with this setup in ovirt and 2 KVM hosts: Hosts kvm1 and kvm2 Volume Group vg_vm Logical Volume lv-vm1 and lv-vm2 vg_vm/lv-vm1 is mounted in kvm1 with XFS and vg_vm/lv-vm2 mounted in kvm2 with XFS, when kvm1 is stopped vg_vm/lv-vm1 can be mounted in kvm2. Am I correct? Thank you
I might be wrong, but I think that the SAN LUN is used as a PV and then each disk is a LV from the Host Perspective. Of course , I could be wrong and someone can correct me. All my oVirt experience is based on HCI (Gluster + oVirt). Best Regards, Strahil Nikolov В четвъртък, 22 октомври 2020 г., 09:38:43 Гринуич+3, lsc.oraes@gmail.com <lsc.oraes@gmail.com> написа: Hi all I come from Oracle VM x86 world and we are planning from moving Oracle VM to oVirt. I am having hard time understanding Storage Domains in oVirt. All our storage are SAN and I wonder how can we manage SAN LUN in oVirt to create a storage domain such that the VM guests can run in any host in the oVirt Cluster? For example in Oracle VM the Storage Repository (it is the Storage Domain in OVM words) are based on SAN LUNs and on top of that a cluster filesystem is created so all hosts in the cluster have concurrent access to the storage repository and the VM guest can be started in any of the hosts in the cluster. How do we accomplish the same in oVirt with SAN Storage? Which Cluster Filesystem is supported in Storage Domain? Or perhaps in oVirt the mechanism is totally different? Thank you _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-leave@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/XMXDRNDT6BJ63F...
participants (3)
-
Juhani Rautiainen -
lsc.oraes＠gmail.com -
Strahil Nikolov