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Veeam Backup & Replication 9.5
User Guide for VMware vSphere

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.
  • 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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