A way for VADP backup tools to read virtual disks over the network. For encrypted disks, SSL has to be turned on, which is known as NBDSSL.
Also called Network Block Device.
Read more: Broadcom TechDocs
In the Ultra Transcenders books
Each book explains NBD in context, with comparison tables and the common traps.
Terms in this definition
- VADP
APIs used by third-party backup software to capture whole-VM images from snapshots. For encrypted VMs, only hot-add or NBD-SSL transport works.
- CRUD
Shorthand for create, read, update and delete, the four basic things you do with data. Data-plane roles in Azure Cosmos DB, for instance, authorise those operations on items.
- OVER
Gives a T-SQL window function its window: PARTITION BY, ORDER BY and, if wanted, a ROWS or RANGE frame. Rankings and running totals can then be worked out while every row is kept.
- SSL
The forerunner of TLS, whose name is still applied to TLS. Terminating TLS at a load balancer is called SSL offload, and VPN Gateway's SSTP (SSL) and OpenVPN (SSL) P2S tunnels run TLS over TCP 443.
- NBDSSL
Encrypts data travelling from the ESXi host to the proxy in Network mode, switched on with the matching option. Expect extra host CPU and possibly slower jobs.
Related terms
- Network mode
The slowest VMware transport, though it works with any setup: ESXi reads VM data and passes it over the LAN to the proxy via NBD on the management network.
- Virtual Disk Development Kit
VMware's programming library for virtual disk access. Network (NBD) and the other VDDK-based proxy transport modes depend on it, which is partly why Veeam suggests keeping proxies off the backup server.