NFS Backup Configuration¶

By default, the Swift object store is used for the backup repository. To use an NFS export as the backup repository, the Cinder backup service must be restarted after adding at least the following two configuration lines to the [DEFAULT] section of the Cinder configuration file cinder.conf:

backup_driver=cinder.backup.drivers.nfs
backup_share=HOST:EXPORT_PATH

Other configuration options may be specified in the [DEFAULT] section as appropriate. Table 4.23, “Configuration options for NFS backup service” below lists the configuration options available for the Cinder Backup service when an NFS export is leveraged as the backup repository.

Option	Type	Default Value	Description
`backup_driver`	Required	`cinder.backup.drivers.swift`	Determines the driver that the backup service will load. [1]
`backup_share`	Required		Set to HOST:EXPORT_PATH. [2]
`backup_mount_options`	Optional		Comma separated list of options to be specified when mounting the NFS export specified in `backup_share` [3].
`backup_compression_algorithm`	Optional	`zlib`	The compression algorithm to be used when sending backup data to the repository. Valid values are `zlib`, `bz2`, and `None`. [4]
`backup_file_size`	Optional	`1999994880`	Data from Cinder volumes larger than this will be stored as multiple files in the backup repository. This option must be a multiple of `backup_sha_block_size_bytes`.
`backup_sha_block_size_bytes`	Optional	`32768`	Size of Cinder volume blocks for digital signature calculation.

Table 4.23. Configuration options for NFS backup service

[1]	Set the value of the `backup_driver` option to `cinder.backup.drivers.nfs` to enable the NFS backup driver.

[2]	Set HOST to the IP address via which the NFS share is exported (for example, the address on the appropriate NFS data LIF on an ONTAP storage system). Set PATH to the export path used to mount the share.

[3] Mount options such as nfsvers should be specified appropriately according to the configuration of the NFS server. For example, if an AltaVault appliance is acting as the backup repository, the appliance will recommend these mount options: rw,nolock,hard,intr,nfsvers=3,tcp,rsize=131072,wsize=131072,bg

[4] NetApp recommends that the backup_compression_algorithm option be set to None in order to avoid consuming excess CPU on the Cinder backup node, and that purpose-built deduplication and compression features be enabled on the ONTAP storage system providing the backup repository to achieve storage efficiency.