Windows file-level replica requirements
The following topics cover the requirements for Windows file-level replicas:
Notes:
• | Only one Windows replica can exist per Windows asset. You cannot run both an image-level replica and a file-level replica of the same asset at the same time. If a replica exists, you must tear it down before creating another for the asset. |
• | You can opt to run file-level replicas in the Unitrends Cloud. Contact your Account Manager for assistance. |
An agent-based, file-level backup of the physical Windows machine is required to create the replica. (To use a Windows image-level backup, see Windows image-level replicas.)
• | The backup must contain: |
– | System files and folders. |
– | The system state, which includes the registry, IIS metabase, COM+ certificates, active directory information, and other key components. |
– | Disk metadata and layout, file system configurations, and other hardware-related information. |
• | The backup must be a local backup run by the appliance where you are creating the Windows replica. You cannot create a replica from an imported backup or from a backup copy. |
Notes:
• | By default, file-level backups include all system information needed to create a Windows replica. If you opt to exclude data from backup, use care not to exclude the system state and the boot and critical system (OS) volumes. |
• | The replica virtual machine is created based on the backup you select. Volumes that were excluded from backup are not recovered. |
• | For SQL, the master, model, and msdb system databases must also be present in the file-level backup of the Windows asset. (These are included by default. If you want the Windows replica to include a hosted SQL application, use care not to exclude these system databases from the file-level backup.) |
Back up the Windows asset regularly to keep the replica up to date. See these topics for details:
• | To create a job manually, see To create a file-level backup job. |
• | To create a job by using an SLA policy, see To create an SLA policy for Windows and Linux file-level assets. |
• | For a comparison of the manual and SLA policy job creation methods, see About creating backup and backup copy jobs. |
If the Windows asset is hosting SQL or Exchange, you can configure the replica to include these applications. In this case, SQL or Exchange application backups are also required. See SQL and Exchange for details.
Requirements vary by where the replica resides. See these topics for details:
The replica can reside on any of the following: a Recovery Series physical appliance, a Recovery MAX physical appliance, an ESXi server, or a Hyper-V server. Considerations for each are given in the following table.
Replica location |
Considerations |
|||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Recovery Series or Recovery MAX physical appliance |
Running the replica on the backup appliance itself provides a simple, seamless solution. Note that only Recovery Series and Recovery MAX physical appliances have this option. (A replica cannot reside on a Unitrends Backup virtual appliance.) Consider the following to determine whether this is the optimal replica location for your environment:
|
|||||||||||||||
ESXi or Hyper-V server |
Running the replica on an ESXi or Hyper-V server enables access to the compute and storage in your virtual environment, greatly increasing the pool of resources that can be used for replicas. Consider the following to determine whether this is the optimal replica location for your environment:
|
Ensure that the following requirements have been met before you create the Windows replica.
Requirement |
Description |
||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Allocate storage |
Appliance storage can be used to store backups, for VM instant recovery, or for Windows replicas. To use the Windows replica and VM instant recovery features, you must allocate a portion of the appliance storage to Instant Recovery in the Edit Storage dialog (as described below). Before allocating storage, determine the percentage to use for backups and the percentage to reserve for Windows replicas and VM instant recovery. Once storage is allocated to instant recovery, it can be used only for Windows replicas and VM instant recovery. The storage is reserved and cannot be used for other purposes, such as backups or deduplication (but you can modify your storage allocation at any time). Because the appliance is designed to retain as many local backups as possible, it is best to reserve instant recovery space soon after initial deployment. If necessary, you can allocate instant recovery space later, but doing so may require the appliance to purge local backups to make room for the newly allocated instant recovery space. Note: You do not need to allocate instant recovery storage if the Windows replica will reside on an ESXi or Hyper-V server. This procedure is only required for Windows replicas that reside on the appliance itself. To allocate storage for Windows replicas
The minimum space needed for a replica is the total amount of space in use on the original asset (the sum of used space on all disks).
|
||||||||||||
Unitrends appliance resources |
The replica uses part of the Unitrends appliance’s processors, memory, and storage. This usage may impact the performance of regular system functions (such as backups, backup copies, deduplication, and purging). Monitor the appliance closely and make adjustments as necessary. Minimum replica requirements:
|
||||||||||||
UEFI-based assets |
Replicas of UEFI-based assets are supported on the following:
Replicas of UEFI-based assets are NOT supported on physical appliances running the CentOS 6 operating system. To check the appliance OS version, select ? > About in the appliance UI:
|
||||||||||||
GPT-partitioned assets |
Instant recovery is supported for GPT-partitioned volumes. |
Ensure that the following requirements have been met before you create the file-level replica.
Requirement |
Description |
||||||
---|---|---|---|---|---|---|---|
Hypervisor version |
The ESXi host must meet these requirements:
|
||||||
Virtual host asset |
The ESXi server must be added to the appliance as an asset. See Adding a virtual host. |
||||||
Compute |
One replica requires a minimum of 2048 MB of memory. (This number must be a multiple of 4.) |
||||||
Replica VM changeability |
Once you have configured the replica in the Create Windows Replica dialog, do not make any changes to the replica VM. Any alteration to the replica (unless it is in live mode) may lead the replica to an inconsistent state. |
||||||
Maximum disk size |
The maximum disk size is capped by what the hypervisor supports. The replica's disks will be the same size as those on the original asset. For Windows assets with disks larger than 2 TB, the ESXi server must be running ESXi 5.5 or a higher version listed in the Compatibility and Interoperability Matrix. |
||||||
Virtual hardware version |
The replica VM is configured with the highest hardware version that the hypervisor supports. |
||||||
Hosted SQL application |
If the file-level replica will include a SQL application, the original asset cannot contain a D drive letter. If there is a D drive on the original asset, SQL restores will fail to process during replica restores. To resolve this issue, use image-level or VMware replicas instead, or change the drive letter of the original asset to no longer use drive D. |
Ensure that the following requirements have been met before you create the file-level replica.
Requirement |
Description |
||||||
---|---|---|---|---|---|---|---|
Hypervisor version |
The hypervisor must be one of the following:
The Hyper-V host must support the operating system (OS) of the Windows asset. (See this Microsoft article for details: Should I create a generation 1 or 2 virtual machine in Hyper-V?) For example, a replica of a Windows 2016 asset cannot reside on a Hyper-V 2008 R2 host. |
||||||
Host agent version |
The Hyper-V host must be running Unitrends agent version 9.2 or higher for Windows 2016, 10.4.4 or higher for Windows 2019, and 10.6.2 or higher for Windows 2022. It is best practice to run the latest Unitrends appliance and agent software versions. Older versions do not support all current Unitrends features. For example, to protect SQL Always On availability groups, the appliance and Windows agent must be running release 10.0.0-2 or later. |
||||||
Virtual host asset |
The Hyper-V host must be added to the Unitrends backup appliance as a protected asset. See Adding a virtual host. |
||||||
Virtual host Samba access |
The Hyper-V server must be able to access the appliance's Samba share:
Note: Upgrading from a pre-10.4.8 version does not change the SMB 1.0 setting. (To configure your appliance to use SMB 2.0, see How Unitrends supports SMBv2.) |
||||||
Compute |
One replica requires a minimum of 2048 MB of memory. (This number must be a multiple of 4). |
||||||
Replica VM changeability |
Once you have configured the replica in the Create Windows Replica dialog, do not make any changes to the replica VM. Any alteration to the replica (unless it is in live mode) may lead the replica to an inconsistent state. |
||||||
Maximum disk size |
The maximum disk size is capped by what the hypervisor supports. The replica's disks will be the same size as those on the original asset. For Windows assets with disks larger than 2 TB, the Hyper-V server must be running version 2012 or a higher version listed in the Compatibility and Interoperability Matrix. |
||||||
Replica VM configuration |
The replica VM is created with this configuration:
|
||||||
Pass-through disks |
Pass-through disks are supported. After you bring the replica online to assume the role of the failed asset, you must refresh and reconnect any existing iSCSI targets. |
Ensure that the following requirements have been met before you create the Windows replica.
Requirement |
Description |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|
Cluster asset |
To run a replica on a Hyper-V server in a cluster configuration, ensure that these requirements have been met:
|
|||||||||
Storage |
The Hyper-V cluster must be configured with Cluster Shared Volumes (CSVs). SMB storage is not supported. |
|||||||||
PowerShell FailoverClusters modules |
These modules must be installed on every node in the cluster so that the appliance can discover the CSVs. |
|||||||||
Selecting the replica location |
To create a clustered replica, you must select the cluster itself as the Location in the Create Windows Replica dialog. Do not select an owner node. If you select an individual node in the cluster, the replica will not be clustered. |
|||||||||
Network switch selection |
For a clustered replica, select the Network Switch common to all nodes in the cluster (in the Create Windows Replica dialog). If you do not select this switch, a 'live' replica that fails over to another node will lose network connectivity. |
|||||||||
2008 R2 clusters |
To run the replica on 2008 R2 servers in a cluster configuration, enable DCOM and WMI Virtualization access for all nodes in the cluster. For instructions, see Security settings for creating a clustered virtual failover client on Hyper-V server 2008 R2. |
|||||||||
Live migration interoperability |
During live migration of a clustered replica, the Unitrends appliance cannot apply backups to the replica, verify or audit the replica, or bring the replica online in production to assume the role of the original asset. If the appliance attempts to apply a backup or verify the replica during a live migration, the appliance waits several minutes and then attempts the operation again. If you try to audit the replica or bring it online in production, the appliance notifies you that it cannot run the operation because of the migration and you must try again later. |
The Windows asset must meet the following requirements to use the file-level replica feature:
Requirement |
Description |
||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Client Operating Systems |
The file-level replica feature is supported for the client operating systems listed below. Additional version limitations apply. See the Compatibility and Interoperability Matrix for details.
Note: To run a replica on a virtual host, the Hyper-V or ESXi host must support the guest OS of the replica VM. (See the Microsoft or VMware documentation for details.) For example, a replica running Windows 10 cannot reside on ESXi 5.1 or Hyper-V 2008 R2. |
||||||||||||||||||||||||||||||||||||
Server Operating Systems |
The file-level replica feature is supported for the server operating systems listed below. Additional version limitations apply. See the Compatibility and Interoperability Matrix for details.
Note: To run a replica on a virtual host, the Hyper-V or ESXi host must support the guest OS of the replica VM. (See the Microsoft or VMware documentation for details.) For example, a replica running Windows 2016 cannot reside on ESXi 5.1 or Hyper-V 2008 R2. |
||||||||||||||||||||||||||||||||||||
If the Windows asset is hosting SQL or Exchange, you can configure the replica to include these applications. The following requirements and limitations apply:
Notes: If you are running both image-level and file-level backups of the Windows asset and have configured image-level backups to use the application aware setting, the following apply to file-level replicas of the asset:
|
|||||||||||||||||||||||||||||||||||||
Some Windows applications require network access and/or rely on underlying hardware, like network interface MAC addresses, in order to run properly. When booting a Windows replica in audit mode, there is no network interface, so applications requiring network connectivity will not function properly. This is expected behavior. When booting a Windows replica in live or audit mode, applications that rely on unchanging hardware (like MAC addresses) may not function properly or may require re-authentication, re-installation, or other special actions that are application specific in order for them to work properly. You should work with the application vendor to determine what actions are required. |
|||||||||||||||||||||||||||||||||||||
Firmware interface type |
The file-level replica feature supports BIOS- and UEFI-based assets. For UEFI-based assets, the replica must reside on one of the following:
Note: A UEFI-based replica cannot reside on a physical appliance that is running the CentOS 6 operating system. |
||||||||||||||||||||||||||||||||||||
Disk configuration |
The file-level replica feature supports Windows machines configured with basic disks and dynamic disks, as long as the boot and system disks are not dynamic. The following types support dynamic volumes configured as data volumes:
Notes:
|
||||||||||||||||||||||||||||||||||||
Disk partition type |
The file-level replica feature is supported for assets with GUID Partition Table (GPT) and Master Boot Record (MBR) partitions. For assets with GPT partitions, the replica must reside on one of the following:
|
||||||||||||||||||||||||||||||||||||
Software RAID volumes |
The file-level replica feature is not supported for software RAID configurations. |
||||||||||||||||||||||||||||||||||||
Deduplicated volumes |
Volumes that use Microsoft deduplication are not supported in cases where the size of the data on the volume before it has been deduplicated is greater than the physical capacity of the volume. Because data is applied to the replica in its non-deduplicated form, the volume must have enough capacity to house this non-deduplicated data. |
||||||||||||||||||||||||||||||||||||
Number of volumes |
The Windows asset can have a maximum of 20 volumes, including the System Reserved volume and other unmounted volumes. A replica with more than 20 volumes may fail to boot. |
||||||||||||||||||||||||||||||||||||
Separate boot and system partitions |
For Windows assets with boot and system partitions located on different disks, the system partition must reside on the first disk (Disk 0). |
||||||||||||||||||||||||||||||||||||
File System Configuration |
The file-level replicas feature supports the following file systems:
|
||||||||||||||||||||||||||||||||||||
Active Directory |
The file-level replica feature supports Active Directory database (NTDS) located on the boot volume only. (If it is not on the boot volume, the configuration is not supported and you see an error message when you attempt to create the replica.) |