Cold migrations, clones and snapshot migrations all rely on this vSphere service, which ESX hosts use to move and copy files from one datastore to another. If needed, its traffic can be kept separate by placing it on the provisioning TCP/IP stack.
Also called Network File Copy.
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In the Ultra Transcenders books
Each book explains NFC in context, with comparison tables and the common traps.
Terms in this definition
- Cold
Online access tier for blobs that costs less to store than Cool but more to read, while data stays instantly available.
- snapshot
Captures a VM's disk state, power state, settings and, if requested, memory at a moment in time, using one delta disk per virtual disk. Snapshots should not be relied on as backups.
- ALL
A DAX function that ignores any filters and gives back every row of a table or every value of the named columns. Used within CALCULATE, it works as a modifier that clears filters, although REMOVEFILTERS states that intent more clearly where it is available.
- RELY
Tells the optimiser it can depend on a primary key or unique constraint when rewriting queries, perhaps dropping a join or a
DISTINCT. The keys remain unenforced, and this works only on serverless compute or on pro or serverless SQL warehouses. - vSphere
VMware's platform for virtualisation, made up of vCenter and ESX hosts, supplying compute for VCF clusters.
- ESX
VMware's bare-metal hypervisor, installed on each host in a VCF fleet. Up to version 9.0 it was known as ESXi.
- Datastore
A named pointer in the workspace to Blob, Azure Files or ADLS Gen2 storage that keeps the connection details, so code never needs to carry storage keys itself.
- TCP/IP stack
ESX hosts can hold several VMkernel network stacks, each with separate gateway and routes: default, vMotion, provisioning, or custom. Create a VMkernel adapter on the vMotion stack and default-stack adapters stop being usable for vMotion.