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The latest version of CloudBacko Pro must be installed on the Hyper-V server. For Hyper-V Cluster environment the latest version of CloudBacko Pro must be installed on all Cluster nodes.
CloudBacko Pro must have sufficient Hyper-V add-on modules (per CPU socket) purchased. Hyper-V Cluster backup sets will require one CloudBacko Pro and Hyper-V module licenses per node.
Hyper-V guest virtual machines contain three types of virtual disks:
When CloudBacko Pro backs up a Hyper-V guest virtual machines for an initial or subsequent full backup jobs:
The default Java heap size setting on CloudBacko Pro is 2048MB, for Hyper-V backups it is highly recommended to increase the Java heap size setting to improve backup and restore performance. (The actual heap size is dependent on amount of free memory available on your Hyper-V server).
Delta generation of large VHD files is a memory intensive process; therefore, it is recommended that the Java heap size to be at least 2048MB - 4096MB. The actual required Java heap size is subject to various factors including files size, delta mode, backup frequency, etc.
Refer to this forum thread for how to configure Java heap size on your CloudBacko Pro.
For stand-alone Hyper-V server, CloudBacko Pro uses the temporary folder for storing backup set index files and any incremental or differential delta files generated during a backup job. To ensure optimal backup / restore performance, it should be located on a local drive with plenty of free disk space. It should not be on the Windows system C:\ drive.
For Hyper-V server in Failover Cluster environment, the temporary folder must be set to a network shared path accessible to all cluster nodes, or a Cluster Shared Volume.
CloudBacko Pro UI must be running when a guest virtual machine is started using Run Direct Restore or when migration process is running.
Make sure NFS service has started for Run Direct to operate. If the backup destination is located on network drive, the logon account must have sufficient permission to access the network resources.
The operating system account for setting up the Hyper-V / Hyper-V Cluster backup set must have administrator permission (e.g. administrative to access the cluster storage).
For Granular Restore, Windows User Account Control (UAC) must be disabled.
For local, mapped drive, or removable drive storage destinations with Run Direct enabled, the compression type will always be set to No Compression and data encryption is disabled to ensure optimal backup and restore performance. The backup set compression type and data encryption settings will only be applied to CBS, SFTP/FTP, or Cloud storage destinations.
For ease of restore it is recommended to back up the whole guest machine (all the virtual disks) rather than individual virtual disks.
The Hyper-V management tools are installed on the server. For Hyper-V Cluster environments Hyper-V management tools is installed on all Cluster nodes.
The Hyper-V services are started on the server. For Hyper-V Cluster environments the Hyper-V services are started on all Cluster nodes.
Example: Windows 2008 R2 Hyper-V
The Microsoft Hyper-V VSS Writer is installed and running on the Hyper-V server and the writer state is Stable. This can be verified by running the vssadmin list writers command.
Example:
C:\Users\Administrator>vssadmin list writers vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool (C) Copyright 2001-2005 Microsoft Corp. Writer name: 'Task Scheduler Writer' Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124} Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b} State: [1] Stable Last error: No error Writer name: 'VSS Metadata Store Writer' Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06} Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93} State: [1] Stable Last error: No error Writer name: 'Performance Counters Writer' Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2} Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381} State: [1] Stable Last error: No error Writer name: 'System Writer' Writer Id: {e8132975-6f93-4464-a53e-1050253ae220} Writer Instance Id: {8de7ed2b-8d69-43dd-beec-5bfb79b9691c} State: [1] Stable Last error: No error Writer name: 'SqlServerWriter' Writer Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a} Writer Instance Id: {1f668bf9-38d6-48e8-81c4-2df60a3fab57} State: [1] Stable Last error: No error Writer name: 'ASR Writer' Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4} Writer Instance Id: {01499d55-61da-45bc-9a1e-76161065630f} State: [1] Stable Last error: No error Writer name: 'Microsoft Hyper-V VSS Writer' Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de} Writer Instance Id: {a51919e3-0256-4ecf-8530-2f600de6ea68} State: [1] Stable Last error: No error Writer name: 'COM+ REGDB Writer' Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f} Writer Instance Id: {7303813b-b22e-4967-87a3-4c6a42f861c4} State: [1] Stable Last error: No error Writer name: 'Shadow Copy Optimization Writer' Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f} Writer Instance Id: {d3199397-ec58-4e57-ad04-e0df345b5e68} State: [1] Stable Last error: No error Writer name: 'Registry Writer' Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485} Writer Instance Id: {25428453-2ded-4204-800f-e87204f2508a} State: [1] Stable Last error: No error Writer name: 'BITS Writer' Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0} Writer Instance Id: {78fa3f1e-d706-4982-a826-32523ec9a305} State: [1] Stable Last error: No error Writer name: 'WMI Writer' Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0} Writer Instance Id: {3efcf721-d590-4e50-9a37-845939ca51e0} State: [1] Stable Last error: No error
# lsmod | grep hv hv_netvsc 23667 0 hv_utils 7012 0 hv_storvsc 10022 2 hv_vmbus 91567 4 hv_netvsc,hv_utils,hid_hyperv,hv_storvsc # ps -ef|grep hv root 267 2 0 18:07 ? 00:00:00 [hv_vmbus_con/0] root 268 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 269 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 270 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 271 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 272 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 273 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 274 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 275 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 276 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 277 2 0 18:07 ? 00:00:00 [hv_vmbus_ctl/0] root 1174 1 0 18:07 ? 00:00:00 /usr/sbin/hv_kvp_daemon root 1185 1 0 18:07 ? 00:00:00 /usr/sbin/hv_vss_daemon root 1332 1316 0 18:11 pts/0 00:00:00 grep hv
For Hyper-V 2008 R2 server in order to use Run Direct restore feature the “Microsoft Security Advisory 3033929” security update must be installed.
Please refer to the following KB article from Microsoft for further details: https://support.microsoft.com/en-us/kb/3033929
For Run Direct Hyper-V Cluster backup sets the storage destination must be accessible by all Hyper-V nodes.
For Hyper-V Cluster backup sets the guest virtual machines must be created and managed by the Failover Cluster Manager.
CBT Cluster Services (CloudBacko Pro) is installed and enabled upon installation / upgrade to version latest version.
1. CBT (Changed Block Tracking) is used to optimize incremental backups of virtual machines by keeping a log of the blocks of data that have changed since the previous snapshot making incremental backups much faster. When CloudBacko Pro performs a backup, CBT feature can request transmissions of only the blocks that changed since the last backup, or the blocks in use.
CBT service is supported on all the backup destinations for CloudBacko Pro.
2. CBT cluster service is only installed on Windows x64 machine.
3. Check if CBTFilter is enabled.
Example:
i. This can be verified by running the net start CBTFilter command.
C:\Users\Administrator>net start CBTFilter The requested service has already been started. More help is available by typing NET HELPMSG 2182.
ii. Note: For Windows Server 2008 R2, if the following error is displayed
C:\Users\Administrator>net start CBTFilter System error 577 has occurred. Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrect or damaged, or that might be malicious software from an unknown source.
The issue may be related to the availability of SHA-2 code signing support for Windows Server 2008 R2 (https://technet.microsoft.com/en-us/library/security/3033929).
To resolve the issue, install the following patch from Microsoft https://www.microsoft.com/en-us/download/confirmation.aspx?id=46083
Restart the affected server afterward for CloudBacko Pro to operate properly.
4. CBT Cluster Service and CBTFilter will NOT be installed on Windows Server 2016 where a built-in system called Resilient Change Tracking (RCT) will be used instead. For details of RCT, please refer to Windows Server 2016 and 2019 RCT Requirement.
1. CloudBacko Pro would not install CBT Cluster Services (CloudBacko Pro) but use the native built-in RCT (Resilient Change Tracking) feature of Windows server 2016 instead.
2. The guest virtual machine version in Hyper-V must be 8.0 or above.
Example:
i. This can be verified by using Windows PowerShell.
get–VM | format–table name, version
ii. If the version is not 8.0 or above, then need to upgrade the virtual machine configuration version.
Update-VMversion <vmname>
Please refer to the following link of Microsoft for details about virtual machine version: https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/deploy/Upgrade-virtual-machine-version-in-Hyper-V-on-Windows-or-Windows-Server
To get full use of Hyper-V, install the appropriate linux-tools and linux-cloud-tools packages to install tools and daemons, e.g. VSS Snapshot Daemon, for use with virtual machines. Please refer to the following link for the details of requirements for Ubuntu relating to Hyper-V daemons: https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/supported-ubuntu-virtual-machines-on-hyper-v