An administrator is notified that a bare metal database server is down. This database server is being served storage using a Nutanix Volume Group. Upon investigating, the administrator finds that the disks in the database server that map to the vDisks in the volume group have gone offline.
What is causing this issue?
The described issue of database server disks mapping to vDisks in the volume group going offline is likely caused by port 3260 being blocked in the server firewall. Nutanix Volumes uses port 3260 for iSCSI traffic, which is essential for communication between the volume group and the database server. If this port is blocked, the database server will not be able to access the storage, causing the disks to go offline.
Nutanix Volumes uses port 3260, thus, if this port os blocked by the firewall the behavior described above happens.
Allow 3205 and 3260 in Firewall for communication between the cluster and clients. Note: For destination, the ports should be open for the Prism Element Data Services IP and each Controller VM IP address. https://portal.nutanix.com/page/documents/list?type=software&filterKey=software&filterVal=Ports%20and%20Protocols&productType=Volumes&a=33a7991aa3f9f05c71e0dea91966fb7c025da4caa0b2c60693f0bec78993c7b7a5e412641a7978d3
Answer is 'C'.
Data Service IP is used for iSCSI traffic, if the CVM serving the Volume Group has gone offline, the other CVM will pick up the job.