VMs with Turbo mode enabled leverage SPDK and vhost technologies to optimize IO paths (allowing IO traffic to directly access hardware without going through the OS kernel) and reduce storage IO latency. These VMs are ideal for IO-intensive service scenarios, such as transaction processing and query acceleration in Oracle and MySQL databases, realtime reads/writes in HBase databases, and low-latency IO operations in financial trading systems. VMs with Turbo mode enabled can be used together with ordinary VMs. Turbo mode can be directly enabled for Linux VMs. To enable Turbo mode for Windows VMs, install vmTools first.
Use Restrictions
Common Features of VMs with Turbo Mode Enabled
Feature
Supported or Not
Offline Specification Change
Yes. You can change CPU and memory specifications. (Huge-page memory must be enabled. If it is disabled, enable it and restart the VM.)
Online Specification Change
Yes. You can only increase the number of CPUs and the memory size. To change disk specifications (including capacity and IO limit), power off the VM first.
Cold Migration (Run Location)
Yes. You can migrate powered-off or suspended VMs across nodes in the same datastore. (SPDK must be enabled for the destination node.)
Live Migration (Datastore)
No. You can migrate only powered-off or suspended VMs across datastores.
HA
No. The built-in HA feature of HCI VMs is not supported if Turbo mode is enabled. (Application-layer disaster recovery is required when the node where the VMs reside fails.)
VM Snapshot
Yes. You can create only storage based snapshots (disk based snapshots are not supported).
Cloning
Yes. Only full cloning is supported (linked cloning is not supported), and you need to enable Turbo mode again after the cloning.
Backup
No. You cannot configure backup or CDP policies to enable VM backup. Third-party agent-based backup or application-layer backup is required.
Disk Management
No. Dynamic disk provision, disk encryption, and space reclamation are not supported. Only thinly provisioned and pre-allocated disks are supported.
Cluster Node Requirement
Yes. VMs must reside in datastores using three or more nodes.
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