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Veeam Backup & Replication 9.5
User Guide for VMware vSphere

HPE StoreOnce

You can use HPE StoreOnce storage appliances as backup repositories.

To work with HPE StoreOnce, Veeam Backup & Replication leverages the HPE StoreOnce Catalyst technology and two HPE StoreOnce components:

  • HPE StoreOnce Catalyst agent. The HPE StoreOnce Catalyst agent is a component of the HPE StoreOnce Catalyst software. The HPE StoreOnce Catalyst agent is embedded into the Veeam Data Mover Service setup. When you add a Microsoft Windows server to the backup infrastructure, the HPE StoreOnce Catalyst agent is automatically installed on the added server together with the Data Mover Service.
  • HPE StoreOnce appliance. The HPE StoreOnce appliance is an HPE StoreOnce storage system on which Catalyst stores are created.

HPE StoreOnce Deployment

To communicate with HPE StoreOnce, Veeam Backup & Replication uses two Data Mover Services that are responsible for data processing and transfer:

  • Veeam Data Mover on the backup proxy
  • Veeam Data Mover on the gateway server

The HPE StoreOnce storage cannot host Veeam Data Mover Service. For this reason, to communicate with the HPE StoreOnce storage, you need to deploy a gateway server. Veeam Backup & Replication will automatically deploy a Veeam Data Mover on this gateway server. For more information, see Gateway Server. For communicating with the HPE StoreOnce storage appliances, the gateway server must run a 64-bit Microsoft Windows version.

When any job addresses the backup repository, the Data Mover Service on the gateway server establishes a connection with the Data Mover Service on the backup proxy, enabling efficient data transfer over LAN or WAN.

HPE StoreOnce 

The gateway server is selected when you assign a backup repository role to the HPE StoreOnce appliance. You can define the gateway server explicitly or instruct Veeam Backup & Replication to select it automatically.

HPE StoreOnce Important!

For HPE StoreOnce storage systems working over Fibre Channel, you must explicitly define the gateway server to communicate with HPE StoreOnce. As a gateway server, you must use a Microsoft Windows server that is added to the backup infrastructure and has access to HPE StoreOnce over Fibre Channel.

HPE StoreOnce Tip:

For work with HPE StoreOnce, Veeam Backup & Replication uses the Catalyst agent installed on the gateway server. If you want to reduce the load on the network between the source and target side, assign the gateway server role to a machine on the source side, closer to the backup proxy.

Limitations for HPE StoreOnce

If you plan to use HPE StoreOnce as a backup repository, mind the following limitations. Limitations apply only if you use HPE StoreOnce in the integration mode, not the shared folder mode.

  • Backup files on HPE StoreOnce are locked exclusively by a job or task. If you start several tasks at a time, Veeam Backup & Replication will perform a task with a higher priority and will skip or terminate a task with a lower priority.

In Veeam Backup & Replication, tasks have the following priority levels (starting with the top priority): restore > backup job > backup copy. For example, if the backup and backup copy jobs start simultaneously, Veeam Backup & Replication will terminate the backup copy task.

  • When you create a backup job targeted at HPE StoreOnce, Veeam Backup & Replication will offer you to switch to optimized job settings and use the 4 MB size of data block for VM data processing. It is recommended that you use optimized job settings. Large data blocks produce a smaller metadata table that requires less memory and CPU resources to process.
  • The HPE StoreOnce backup repository always works in the Use per-VM backup files mode. For more information, see Per-VM Backup Files.
  • HPE StoreOnce does not support the reverse incremental backup method.
  • HPE StoreOnce does not support the forever forward incremental backup method. When creating a backup job, you must enable synthetic and/or active full backups. Otherwise, you will not be able to create a backup job.
  • The HPE StoreOnce backup repository does not support the Defragment and compact full backup file option (for backup and backup copy jobs).
  • You cannot use HPE StoreOnce backup repositories as targets for Veeam Endpoint backup jobs. Backup copy jobs, however, can be targeted at HPE StoreOnce backup repositories.
  • You cannot use HPE StoreOnce backup repositories as sources or targets for file copy jobs.
  • You cannot copy backup files (VBK, VIB and VRB) manually to the HPE StoreOnce backup repository. To copy such files, use backup copy jobs.
  • You cannot use the HPE StoreOnce backup repository as a cloud repository.
  • HPE StoreOnce has a limit on the number of concurrently opened files. Due to this limit, the maximum length of backup chains (chains that contain one full backup and a set of subsequent incremental backups) on HPE StoreOnce is also limited and depends on the particular storage model:


Maximum number of restore points per backup chain

Current Products


42 (per node)











Previous Products


28 (per node)


14 (per node)













Several Backup Repositories on HPE StoreOnce

You can configure several backup repositories on one HPE StoreOnce appliance and associate them with different gateway servers.

Mind the following:

  • If you configure several backup repositories on HPE StoreOnce and add them as extents to a scale-out backup repository, make sure that all backup files from one backup chain are stored on one extent. If backup files from one backup chain are stored to different extents, the transform operations performance will be lower. For more information about transform operations performance, see
  • HPE StoreOnce has a limit on the number of opened files that applies to the whole appliance. Tasks targeted at different backup repositories on HPE StoreOnce and run in parallel will equally share this limit.
  • For HPE StoreOnce working over Fibre Channel, there is a limitation on the number of connections from one host. If you connect several backup repositories to one gateway, backup repositories will compete for connections.
  • Deduplication on HPE StoreOnce works within the limits of one object store.

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