The Delphix Engine is a virtual appliance that runs in a hypervisor. In this section, you’ll find requirements to run Delphix on Hyper-V including supported versions and instance configurations as well as recommended configuration parameters for optimal performance.  

Contact your Delphix representative to request this capability. Delphix will assist you to review that all Hyper-V requirements are met to successfully run a Delphix Engine with the most appropriate configuration for your Use Cases.

The Delphix Engine is intensive both from a network and a storage perspective. If the Delphix Engine competes with other virtual machines on the same host for resources it will result in increased latency for all operations. As such, it is crucial that your Hyper-V host is not over-subscribed, as this eliminates the possibility of a lack of resources for the Delphix Engine. This includes allowing a percentage of CPU resources for the hypervisor itself as it can de-schedule an entire VM if the hypervisor is needed for managing I/O or compute resources.

This section has the following topics:

  •   Supported Versions
  •   Virtual CPU Count
  •   Memory
  •   Network
  •   SCSI Controller
  •   General Storage
  •   Delphix VM Configuration Storage
  •   Delphix Engine System Disk Storage
  •   Database Storage
  •   Additional Configuration Notes

Supported Versions

  • Hyper-V Version: 10.0 and later
  • Virtual Machine: Gen 1 only is supported

Virtual CPUs

RequirementsNotes
8 vCPUs
  • CPU resource shortfalls can occur on an 0ver-committed host as well as competition for host resources during high IO utilization.
  • CPU reservations are strongly recommended for the Delphix VM so that Delphix is guaranteed the full complement of CPUs even when resources are overcommitted.
  • It is suggested to use a single core per socket unless there are specific requirements for other VMs on the same Hyper-V host.
Never allocate all available physical CPUs to virtual machines.
  • CPU for the Hyper-V Server to perform hypervisor activities must be set aside before assigning vCPUs to Delphix and other VMs
  • We recommend that a minimum of 8-10% of the CPUs available are reserved for hypervisor operation. (e.g. 12 vCPUs on a 128 vCore system).

Memory

RequirementsNotes

128 GB vRAM (recommended)

64GB vRAM (minimum)

  • The Delphix Engine uses its memory to cache database blocks. More memory will provide better read performance.
  • Memory reservations are required for the Delphix VM. The performance of the Delphix Engine will be significantly impacted by the over-commitment of memory resources in the Hyper-V Server. 
  • Reservations ensure that the Delphix Engine will not be forced to swap pages during times of memory pressure on the host. A swapped page will require orders of magnitude more time to be brought back to physical memory from the Hyper-V swap device.
Memory for the Hyper-V Server to perform hypervisor activities must be set aside before assigning memory to Delphix and other VMs. Failure to ensure sufficient memory for the host can result in a hard memory state for all VMs on the host which will result in a block for memory allocations.

Network

RequirementsNotes
Virtual ethernet adapter requirements.
  • SR-IOV recommended for all virtual ethernet adapters that will be used for Delphix data I/O.
  • Jumbo frames recommended.
  • A 10GbE NIC in the Hyper-V Server is recommended.
If the network load in the Hyper-V Server hosting the Delphix engine VM is high, dedicate one or more physical NICs to the Delphix Engine.

SCSI Controller

RequirementsNotes
lDE Controller for boot drive

SCSI Controller for database storage

Per Hyper-V Storage I/O Performance Tuning Guidelines; For optimal performance, it is recommended that you attach multiple disks to a single virtual SCSI controller and create additional controllers only as they are required to scale the number of disks connected to the virtual machine. 

For example, a VM with 3 virtual disks should distribute the disks across the single SCSI controller as follows:

  • IDE Controller 1
    • Boot Drive
  • SCSI Controller
    • disk1
    • disk2
    • disk3

Note: For load purposes, we generally focus on the DB storage and ignore the controller placement of the system disk.

General Storage 

Delphix recommends using a minimum of four disks to run your Delphix Engine. One disk is used for the Delphix File System (DxFS) to ensure that its file systems are always consistent on disk without additional serialization. The other three or more equally sized disks will be used for data storage. This also enables the Delphix Engine to achieve higher I/O rates by queueing more I/O operations to its storage.

RequirementsNotes
Storage used for Delphix must be provisioned from storage that provides data protection.

For example, using RAID levels with data protection features, or equivalent technology. 

The Delphix Engine does not protect against data loss originating at the hypervisor or SAN layers.

For more information refer to, Optimal Storage Configuration Parameters for the Delphix Engine.

Delphix Storage Options

There are two types of data that Delphix stores on disk which must be stored on NTFS volumes: :

  1. Delphix Engine System Disk Storage: which is the system boot drive.
  2. Database Storage: stores data used by Delphix objects such as dSources and virtual databases (VDBs).

Delphix Engine System Disk Storage

RequirementsNotes
The Delphix Engine disks must be stored on NTFS volume(s).The volume for the Delphix Engine System Disk Storage is often created on the same volume as the Delphix VM definition. In that case, the volume must have sufficient space to hold the Delphix VM Configuration, the virtual disk for the system disk, and a paging area if a memory reservation was not enabled for the Delphix Engine.
The Delphix .vhdx file is configured for a 128GB system drive. 

The volume where the .vhdx is deployed should, therefore, have at least 127GB of free space prior to deploying the .vhdx.

Database Storage

In addition to making sure the latest Hyper-V patches have been applied, check with your hardware vendor for updates specific to your hardware configuration. VHDXs (virtual machine disks).

RequirementsNotes
A minimum of 3 VHDXs should be allocated for database storage.

Allocating a minimum of 3 VHDXs for database storage enables the Delphix File System (DxFS) to make sure that its file systems are always consistent on disk without additional serialization. This also enables the Delphix Engine to achieve higher I/O rates by queueing more I/O operations to its storage.

If using VHDXs:

  • Each VHDX should be the only VHDX on its NTFS volume
  • The VHDX volumes should be assigned to dedicated physical LUNs on redundant storage. 

Provisioning VHDXs from isolated volumes on dedicated physical LUNs:

    • Reduces contention for the underlying physical LUNs
    • Eliminates contention for locks on the volumes from other VMs and/or the Hyper-V Server Console

If the underlying storage array allocates physical LUNs by carving them from RAID groups, the LUNs should be allocated from different RAID groups. This eliminates contention for the underlying disks in the RAID groups as the Delphix engine distributes IO across its storage devices.

The physical LUNs used for NTFS volumes should be of the same type in terms of performance characteristics such as latency, RPMs, and RAID level.

The total number of disk drives that comprise the set of physical LUNs should be capable of providing the desired aggregate I/O throughput (MB/sec) and IOPs (Input/Output Operations per Second) for all virtual databases that will be hosted by the Delphix Engine

Disk types supported by the physical LUNs used for NTFS volumes are: Fixed-size and Dynamically expanding.

If the storage array allocates physical LUNs from storage pools comprising dozens of disk drives, the LUNs should be distributed evenly across the available pools.

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