SR-IOV
Overview
Single-root input/output virtualization (SR-IOV) is a PCI device virtualization specification that can divide a physical function (PF) into multiple virtual functions (VFs). These VFs share a PCI Express (PCIe).
For example, you can assign a VF NIC to a VM instance without considering the
virtualization layer. Compared with traditional virtualization solutions, SR-IOV has the
following advantages:
- Shorten the data transmission path, improving the I/O performance of VM instances.
- Reduce the consumption of host CPU resources, avoiding packet loss even a host has huge CPU load.
Operations
IsVfNicAvailableInL3Network
Checks whether a VF NIC is available on an L3 network. For
example,
IsVfNicAvailableInL3Network l3NetworkUuid=443e156ec6883356974f97f803187310 hostUuid=037404d26b033e9d9fe0d3e7e4bbaa8bParameters
| Name | Description | Optional | Valid Value | Starting Version |
|---|---|---|---|---|
| l3NetworkUuid | The L3 network UUID. | 3.9.0 | ||
| hostUuid | The host UUID. | 3.9.0 | ||
| userTags | The user tags. For more information, see CreateUserTag. | Yes | 3.9.0 | |
| systemTags | The system tags. For more information, see CreateSystemTag. | Yes | 3.9.0 | |
| timeout | Yes |
ChangeVmNicType
Change the VM NIC type. For
example,
ChangeVmNicType vmNicUuid=ba83aa15bafd33e792267c428465b1e5 vmNicType=VNICParameters
| Name | Description | Optional | Valid Value | Starting Version |
|---|---|---|---|---|
| vmNicUuid | The VM NIC UUID. | 3.9.0 | ||
| vmNicType | The VM NIC type. |
|
3.9.0 | |
| userTags | The user tags. For more information, see CreateUserTag. | Yes | 3.9.0 | |
| systemTags | The system tags. For more information, see CreateSystemTag. | Yes | 3.9.0 | |
| timeout | Yes |