vcdxnz001 wrote:Hi Tom, You're correct. We don't yet support SCSI 3 Presistent Reservations, which are required for the shared disks to work properly with failover clustering. This is likely to change at some point in the future.
Hi David, SCSI3 PR isn't implemented in the Nutanix SCSI stack as yet. So anything that requires SCSI3 PR, including Pass Through RDM's for Failover Clustering, will be prevented from working. However in the case of failover clustering there is a solution that will work on Nutanix using third party tools. If failover clustering for SQL Server and other applications is required then SIOS DataKeeper and other similar tools can be used to enable the traditional failover clusters. These third party tools are supported by their respective vendors. I'll update this thread when there is more news on SCSI3 PR and also any validation / joint papers with SIOS and other vendors of similar technology. Kind regards, Michael
Hi @vcdxnz001 - Time for that update on the thread? :) . Since SCSI-3 PR support was added with AOS 5.17. How it affect WSFC configurations and related on each mayor hypervisor (AHV, ESXi and HyperV) running on Nutanix HCI. Thanks for sharing and commenting.
Here is a good reference: https://next.nutanix.com/archive-44/shared-storage-for-windows-server-failover-clusters-on-nutanix-27364
Now SCSI 3 PR is natively supported it works across hypervisors. For AHV if you connect vDisks to multiple VM’s and use WSFC it will natively work without any special configuration. Usually you would use a shared volume group between the VM’s for the cluster storage. This also works with RedHat and Linux clusters that use SCSI fencing. This is a major win and makes setting up failover clusters very simple.
For ESXi and Hyper-V you may need to use iSCSI connections to Volumes on AOS. Although I think you can pass the SCSI 3 PR command via SMB3 in Hyper-V, so it may also work natively with normal shared vDisks. Recommend using LTS release of 5.20 or above if possible so you get the latest features.
Here is a good article - http://longwhiteclouds.com/2020/11/09/simple-guest-os-clustering-without-complex-config/
Doing a WSFC configuration with WS2019 | ESXi 6.7 | AOS 188.8.131.52, all going well until we add a 5th disk. We are presenting using Nutanix Volumes. Then found this comment https://docs.microsoft.com/en-us/troubleshoot/windows-server/high-availability/scsi-3-persistent-reservation-test-fail. A sort of configured limit could be the reason?. Any advice? - thank you!
There is no configured limit. Are you using iSCSI connections to those volumes? I would suggest opening a support request for that.
Yes, using iSCSI connections. Already working with Nutanix Support.
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