cinder-zfs-driver

A Cinder volume driver for FreeBSD that stores volumes as ZFS zvols.

Status

Features

• Volume create, delete, extend, clone and revert to snapshot
• Snapshots are ZFS snapshots, with deferred destroy while clones depend on them
• Glance image download to a volume and volume upload to an image
• Local attach to a nova-bhyve instance on the same host
• Remote iSCSI volume export served by CTL
• Sparse or fully reserved zvols on disk

Roadmap

• Remote iSCSI attach / os-brick support
• Snapshot export over iSCSI
• Per-initiator ACLs, mutual CHAP and multipath portals
• Volume migration between two backends using zfs send / zfs receive
• Add support for NVMe over Fabrics remote attach

Limitations

• No remote attach / os-brick support so nova and the cinder backend must run on the same host
• Remote snapshot connections are refused

Host requirements

zfs allow delegation is needed for the dataset holding volumes.

Remote export needs ctld running against the driver's config file:

sysrc ctld_flags="-f /var/db/cinder/ctl.conf" ctld_enable=YES
service ctld start

Configuration

[zfs]
volume_driver = cinder_zfs_driver.driver.ZFSVolumeDriver
volume_backend_name = ZFS
zfs_dataset = zroot/cinder
zfs_sparse_volumes = true
use_chap_auth = true
# zfs_ctld_config = /var/db/cinder/ctl.conf
# zfs_local_hosts = alias1,alias2