Enable VM hosts to discover new SAN storage and issue NPIV operations.
- Targeted release: Fedora 12
- Last updated: 2009-08-05
- Percentage of completion: 100%
Guest virtual machines can currently use SAN storage, but administrators must do the storage configuration manually using separate tools from libvirt. This feature will permit administrators to discover storage and present it to virtual machines using libvirt.
Datacenter operations are usually split along functional lines: the server administration team, the SAN administration team, and others (network, etc.) not relevant to this discussion. Within the server admin group, there are often sub-groups for each OS. When a new application is deployed the SAN admins provision the storage and notify whichever OS team is responsible for the server to proceed with the OS install.
There may be more or less information transmitted from the SAN admins to the server admins when the storage becomes available. The minimal message is something along the lines of, "I've provisioned the LUNs, and you should be able to see them now. The LUNs are 27, 28, 29 and 53." The server admin may not know what targets or hosts the new storage is accessible through, but a rescan of all host adapters will show up new logical units of the size requested with numbers 27, 28, 29 and 53 on some target on some host, and the server admin assumes, usually reasonably, that these logical units are the new storage.
While libvirt is currently capable of using SAN storage, it lacks the ability to trigger scans for new storage and create virtual host adapters using NPIV. The OS admin team that manages the VM host must get involved to get the VM host to recognize the new storage. Giving libvirt the ability to manage storage allows the OS admin team responsible for the guest OS to complete the VM build out itself.
The libvirt APIs already permit storage discovery and pool creation. These functions will be extended to discover and rescan storage on a per-SCSI-host basis. The node device APIs will be extended to create and destroy vitrual adapters using NPIV.
Benefit to Fedora
Administrators will be able to provision storage for VMs from the single set of tools that they are already using to manage the VMs.
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