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Nutanix AHV Plug-In for Citrix Director provides more information on Citrix generated desktops running on Nutanix AHV. Some of the metrics that are available in customized reports are:

VM CPU Usage

VM Memory Usage

VM Disk IOPS

VM Disk Bandwidth

In virtualization performance troubleshooting, CPU Ready % is a critical metric that indicates the percentage of time a virtual machine was ready to execute a thread but had to wait for the hypervisor to schedule it on a physical CPU core.

According to standard Nutanix and AHV performance guidelines, a CPU Ready value above 5% per vCPU is considered a leading indicator of CPU contention (oversubscription) and performance degradation. While the overall host CPU Usage appears low (18%), the high CPU Ready (6.5%) suggests that specific VMs are fighting for scheduling slots, causing the latency ("tasks taking longer") reported by the users. The other metrics (IOPS, Storage Usage) are well within normal operating parameters.

one of the possible causes of poor performance in a VDI deployment is power management, which can affect CPU frequency and performance. Therefore, it is recommended to disable any power saving features on the BIOS level, such as C-states and P-states.

Another possible cause of poor performance is network configuration, which can affect network throughput and latency. Therefore, it is recommended to update network drivers and firmware on the Dell XC nodes with ESXi23, and ensure that they are compatible with Nutanix software.

Nutanix AHV includes a native feature called VM High Availability (VMHA), which protects VMs in the event of a host failure (such as power loss).

When a host fails, the Acropolis High Availability service detects the failure. Built-in AHV policies automatically restart the affected VMs on the remaining healthy hosts in the cluster.

Live migration (Option D) is not possible because the host is already down (powered off), meaning the memory state cannot be transferred; the VMs must be restarted (booted) on new hosts. No manual policy creation (Option B) is required as this is a core default function of the AHV cluster, provided resources are available.

Nutanix offers a solution that delivers virtual apps and desktops in one click. Nutanix supports both persistent and non-persistent VDI deployments, as well as RDSH-based VMs and AppStacks.

Storage containers are logical units that group vDisks and apply storage policies such as replication factor, encryption, compression, deduplication and erasure coding3. Nutanix recommends using compression and deduplication to reduce storage usage and avoid duplicate data4.

The charts provided display a scenario typical of a VDI Boot Storm or login storm, characterized by a massive spike in Read IOPS (top chart) while maintaining extremely low Read I/O Latency (bottom chart).

This behavior is best described by Data Locality (specifically leveraged through a mechanism often called Shadow Clones in VDI contexts).

The Scenario: During VDI logins, hundreds or thousands of VMs simultaneously read from the same base "Golden Image" or replica disk.

The Mechanism: Nutanix Data Locality ensures that VM data is served locally from the node where the VM is running. In the specific case of multi-reader VDI workloads, the Nutanix Distributed Storage Fabric detects that the same vDisk is being read by VMs across multiple nodes. It automatically caches this vDisk (Shadow Clone) on the local SSD/RAM of every node.

The Result: As shown in the graphs, the cluster delivers very high Read IOPS because every node is serving its own VMs from local cache, preventing network congestion. Consequently, the latency remains flat and near-zero, rather than spiking as it would in a traditional centralized storage architecture where all reads traverse the network to a single controller.

According to Citrix DaaS (formerly Citrix Virtual Apps and Desktops Service) architecture on Nutanix, a Resource Location is defined by the presence of Cloud Connectors.2 These connectors serve as the communication proxy between the Nutanix AHV infrastructure and the Citrix Cloud control plane.

For Disaster Recovery (DR) planning, the DR site functions as a distinct Resource Location. To ensure the DR site is available and manageable by the Citrix Cloud service during an event, an administrator must deploy at least one Cloud Connector in every resource location (though two are recommended for high availability). Keeping connectors offline (Option A) is unsupported because they require continuous connectivity to receive automatic updates; if they are offline for too long (tombstone life), they become invalid. Recovering connectors during an event (Option D) increases RTO unnecessarily. Therefore, establishing the DR site as a valid resource location with active Cloud Connectors is the correct planning step.

One of them is Nutanix Frame, which is a cloud-based service that delivers virtual apps and desktops from any cloud provider or on-premises datacenter.

Nutanix Frame simplifies VDI deployment by providing automated cloud resource orchestration, user session brokering, and environment administration.

Another solution is Nutanix Citrix Cloud, which is a hybrid cloud solution that integrates Nutanix HCI with Citrix Virtual Apps and Desktops service.

Nutanix Citrix Cloud enables VDI deployment by providing centralized management and delivery of virtual apps and desktops through Citrix Cloud Services.

According to Nutanix best practices2, one of the steps needed for deploying VDI with Nutanix Citrix Cloud is to configure the PE Citrix Connection.

This step involves creating a connection between the Nutanix Prism Element (PE) cluster and the Citrix Cloud account, which allows Nutanix to register as a resource location for Citrix Cloud Services.

This connection also enables Nutanix to provide performance metrics, alerts, and actions for the virtual apps and desktops running on Nutanix HCI.

Comprehensive and Detailed Explanation From Exact Extract of Nutanix End User Computing documents:

According to Nutanix LCM and NVIDIA vGPU operational best practices:

Live Migration Requirement: To keep a VM "online" during a host upgrade, the VM must be live-migrated (vMotioned) off the host entering maintenance mode.

vGPU Constraint: A VM configured with a vGPU profile cannot be live-migrated to a host that does not have a compatible physical GPU resource available.4 The destination host must have a GPU capable of hosting the specific vGPU profile.

The Solution: Since only one host currently has a GPU, there is no valid destination for the VM to migrate to. The administrator must install a GPU in a second host to create a valid migration target. This allows the VM to vMotion to the second host, keeping it online while the first host is upgraded.

To calculate the estimated number of virtual desktops per server, one must consider the physical memory of the GPU, the memory required by the selected vGPU profile, and the number of GPUs installed in the node.

GPU Specifications: The NVIDIA L40S GPU is equipped with 48 GB of physical GDDR6 memory.

Profile Requirements: The L40S-12Q profile allocates 12 GB of frame buffer memory to each virtual desktop.

Density Calculation per GPU: Dividing the total physical memory by the profile memory (48 GB / 12 GB) results in 4 virtual desktops supported per single GPU card.

Server Capacity: The Nutanix NX-9151-G9 platform supports up to four NVIDIA L40S GPUs per node.

Total Estimate: Multiplying the desktops per GPU by the number of GPUs (4 desktops x 4 GPUs) yields a total of 16 virtual desktops per server.