Known Software Issues and Limitations

Issue ID	Product feature	Description	Workaround
0001	Task cancellation	Task cancellation process will not be reflected in immediate task failure - task state will be changed to cancelled and only when the engine checks its state again will it initiate the cancellation operation - some platforms may even require data transfer to be completed first	Allow the task to cancel and fail gracefully - this will allow vPlus to clean up temporary artifacts. If you click again, the task will be forced to be removed from the queue and artifacts such as snapshots will be removed as part of the daily snapshot cleanup job. In general, avoid forced removal of tasks.
0002	Storage usage statistics	Storage statistics are updated after each backup or the clean old backups job - this data may not be up-to-date all the time	To have current storage usage updated you can invoke the Clean Old backups job from the Backup Destinations tab
0003	Pre/post access storage command execution	Complete command cannot be provided as a single string. Commands need to have their arguments provided as separate entries (by clicking on the Add command arg button). Commands are directly executed using OS-level calls so shell operators are not supported directly.	To use shell-specific operators/commands etc., execute commands with 3 command arguments /bin/bash, -c, your command-with-all-arguments-and-shell-operators
0004	Tasks stuck in the queue in Queued state	Tasks will usually be executed according to the limits set on the node and only if node is running and has available space on the staging	Verify that the node has available space in the staging space path - there should be a warning message in vprotect_daemon.log
0005	OpenStack backup using disk attachment	OpenStack with disk-attachment backup strategy (cinder) - 3.9.2 only supports Ceph RBD as a storage backend	N/A
0006	KVM stand-alone - disk formats	VMs being backed up must have virtual disks as QCOW2/RAW files or LVM volumes	N/A
0007	KVM stand-alone - snapshots	Snapshots on KVM hypervisors are made using libvirt (QCOW2/RAW files) or LVM snapshots and are created per volume basis; this operation may not be atomic if multiple drives are used	Make sure the data is in the VM (especially that file systems reside on as few disks as possible to lower the risks of data inconsistency) or try to use pre-post remote command execution to quiesce application before snapshot is done
0008	KVM standalone incremental backup on QCOW2	Incremental backups will be performed only on running VMs. libvirt doesn't allow blockcommit on a power-down VM so snapshot wouldn't be removed.	Full backup will be performed instead
0009	Backup providers path	The backup provider's paths must be mounted and available ahead - you should provide the path just to the mount point, without any protocol specification	Mount remote file systems first and make sure these are available all the time - in vPlus configuration provide just the locally available mount point
0010	Backups marked as Success (removed)	When backup completes or when the clean old backups job is performed, vPlus marks non-present backups as removed (if any of the files that were part of the backup are not present). This may also happen if your storage was temporarily not available.	Make sure storage and all of the files are available and run the Clean Old Backups job - this job also attempts again to sync files present in the backup provider with the database - if all files for a particular backup are found again (and all previous backups that this particular backup depends on are also present) it will again have Success status
0011	Hypervisor storage usage statistics	Restore may fail due to insufficient storage space in the Hypervisor Storage used as a target because of usage information that is not up to date. Usage statistics are updated only with inventory synchronization job	Run the Inventory Synchronization job again on your hypervisor (or manager) to update storage statistics and try to restore again.
0012	RHV - SSH transfer rate drops after some time	The SSH transfer rate may drop in some environments when used intensively over a longer time.	If possible, and when the network used for transfers is trusted, please use the netcat option to transfer files outside of the SSH channel
0013	Amazon EC2 - AMIs left in the account	For Amazon EC2 some instances require the original base image to be restored - this is especially true for Windows-based clients where license relates to the original disk image. If an image is not left, vProtect can only restore such guests by creating a new one from the new image (as a root device) that is available and attach data volumes. AMIs are kept as long as the particular backup is going to use them and will be removed together.	For such guests, we recommend to enable Windows (or Linux) image required option in your Hypervisor Manager details
0014	AWS additional costs	TNotice that vProtect needs sometimes to transfer EBS volumes between AZ if it resides in a different AZ then the node - AWS charges for intra-AZ transfers.	Recommended deployment is in the same AZ as the VMs that node is going to protect to limit the number of transfers.
0015	Node tasks limits	The number of concurrent tasks are configured in Node Configuration -> Tasks section. These limits apply to all nodes that use this particular configuration. Currently there is no global setting to limit the number of tasks for all of the nodes in the environment.	To limit the number of tasks globally, reduce the numbers in individual node configurations.
0016	Hypervisor-specific settings in Node Configuration	All of the configuration parameters in Hypervisors tab in Node Configuration are applied to all nodes with this configuration - regardless of which hypervisor it is attached to. This implies that Proxmox settings such as compression will have to be the same on all hypervisors handled by nodes with the same configuration assigned and will have to be the same on all of these hypervisors.	To use these settings with different values for some hypervisors you need to assign separate nodes and define separate node configurations. Ultimately, assign separate nodes for these hypervisors.
0017	Inventory synchronization - duplicated UUID	In some cases, it may happen that the same storage was previously detected with a different setup and remained in the database.	Remove the unused hypervisor storage and try to invoke inventory synchronization again.
0018	Estimated backup size of policy	The estimated backup size of a policy is computed based only on known backup sizes and extrapolated to the rest of the VMs in the group. This implies that estimation will use average backup size and multiply it by the number of all VMs in the group. Even though disk sizes are known it is not always the same as the size of the backups (especially considering compression or the fact that some strategies require chains of backup deltas to be exported)	Wait for a longer period of time, and once more backups are completed this estimation will be closer to the real value.
0019	Citrix Hypervisor/ xcp-ng - transfers	Transfer NIC is not used in incremental backups when the CBT strategy is invoked - Citrix/xcp-ng may require NBD to be exposed by the master - so vPlus has to read from the address provided by the CBT mechanism in order to connect to the NBD device. Also, in some cases, data can only be transferred from the master host (especially when it is powered down)	Allow network traffic between all hypervisors and corresponding nodes in the same pool, as sometimes actual transfer may occur from the master host instead of the one which hosts the VM.
0020	RHV - SSH Transfer permissions on the hypervisor	SSH Transfer for RHV usually requires root permissions on the hypervisor in order to activate/deactivate LVM volumes for the backup	You may try with a different backup strategy such as Disk-attachment or Disk Image Transfer
0021	RHV - SSH Transfer - hypervisor access	vPlus using SSH Transfer for RHV environments needs to be able to access all hypervisors in the cluster - as it may happen that the created disk is available only on a subset of them and needs to be transferred or recovered only by using this specific hypervisor	Allow network traffic and provide valid credentials to access all hypervisors in the cluster over SSH.
0022	Nutanix VG support	vPlus 3.9.2 only supports volumes residing on the storage containers - VGs are not supported yet	N/A
0023	Nutanix Prism Element/Central connectivity	vPlus is able to perform backups by using APIs provided by Prism Element only - Prism Central doesn't offer a backup API	Connect to your Prism elements by specifying separate Hypervisor Managers in vPlus (not by pointing to the Prism Central)
0024	Nutanix backup consistency for intensively used VMs	Intensive workload on the VM may affect backup consistency when using crash consistent backup	If you need higher consistency, install Nutanix Guest Tools inside your VM and enable application consistent snapshots in the VM details in vPlus
0025	iSCSI shares for RAW backups	RAW backups allow vPlus to share them over iSCSI. If backups are in other formats (such as QCOW2), these cannot currently be shared over iSCSI	Use automatic mount instead or restore a backup and mount them using external tools such as qemu-nbd for QCOW2 files
0026	Backup and snapshot policies assignment	Only 1 backup and 1 snapshot management policy can be assigned to a given VM	If you need a dedicated setting for a single VM, you need to create a separate policy for that VM
0027	1 schedule per rule	Currently, each schedule can only be assigned to a single rule within the same policy.	If you need to execute two rules at the same time, you need to create separate schedules and assign them to these rules
0028	Staging space	The staging space is an integral part of a node - this allows to mix backup strategies, especially based on the export storage domain/repository approach with other methods and file system scanning for future file-level restores. It needs to be available at all times and the vprotect user needs to be able to write to all subdirectories.	To save space and boost backup time (direct writes to the backup destination) you can, however, mount staging and your PowerProtect DD in the same directory - /vprotect_data. Remember to point the backup destination path to a subdirectory of this mount point, such as /vprotect_data/backups - still on the same FS, but the paths must be different.
0029	Node OS-level permissions	At the OS level, vPlus requires significant permissions to be able to manipulate disks, scan for file systems, mount them, expose resources over iSCSI, operate on block devices (NBD/iSCSI/RBD) and more. These unfortunately require multiple sudo entries and that SELinux is disabled at the same moment.	If some features are not required at the same moment - including NBD/iSCSI/NFS related - you may reduce the number of entries in /etc/sudoers.d/01-vprotect_node You also can try to enable SELinux, but later you need to track SELinux errors and add appropriate permissions when some of the functionality is blocked
0030	Proxmox VE	CBT backup strategy	Qcow2 virtual machines are required to use the new Proxmox VE backup strategy - Change block tracking ( CBT )
0031	Proxmox VE	CBT backup strategy	At the moment, we do not support the "Dirty Bitmaps" function, therefore we require the last snapshot to be left for incremental backups.
0032	Storage Providers and node assignment	vPlus supports only one node assigned to the Storage Provider, which means that backup of significantly big volumes from bigger storage providers, for example Ceph RBD etc. will require a high performing node and cannot be scaled out by adding nodes	Install multiple vPlus Server+Node environments and protect the non-overlapping set of volumes with each vPlus instance.
0033	RHV - Restore with SPARSE disk allocation format	Restore to RHV using the SPARSE disk allocation format is not supported if backup files are in RAW format and the destination storage domain type is in either Fibre Channel or iSCSI. If such configuration is detected, then the disk allocation format is automatically switched to PREALLOCATED	You can use other backup strategies that use QCOW2 files instead of RAW (like disk image transfer). Alternatively, you can select a different storage domain of a type that supports SPARSE disks with RAW files
0034	Microsoft 365 - Restore of site which has been deleted from Bin	If the site has been deleted from the Bin, only site logic can be restored. Links added in the deleted site are not restored	Restore site or subsites to recover it's logic. Next, download data (site content) manually and upload it to SharePoint Online. Begin download from second level of SharePoint protected data (list/pages/document libary)
0035	Microsoft 365 - Restore 1:1 teams chat	Links shared in chat are not working after restore.	You can still download shared files by copying the link address and pasting it in the different web browser tab.
0036	Microsoft 365 - Restore site from the template	Sometimes after restoring the site from the template, despite the lack of errors in the logs, the page template is not set.	This condition can be repaired by: - re-restore - manual set template
0037	Microsoft 365 - Restore site	Sometimes after restoring the site, you may see You need permission to access this site message	This is due to the lack of a site owner. This condition can be repaired by: - re-restore - set the site owner in the admin panel
0038	Microsoft 365 - Restore site	After restoring the site, the correct images are not visible everywhere	The reason is the change of links to images and they do not always reload correctly after restore. This can be fixed by selecting the desired image from the library again.