A vSAN cluster option that shifts components across capacity devices when the gap in usage between any two exceeds a threshold, 30% unless changed. VCF advises turning it on to keep data evenly spread, despite more resync traffic when hosts join; it is distinct from reactive rebalancing, which begins once a device is 80% full.
Also called vSAN automatic rebalance.
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In the Ultra Transcenders books
Each book explains Automatic rebalance in context, with comparison tables and the common traps.
Terms in this definition
- vSAN
VMware's software-defined storage, which combines local devices across a cluster's ESX hosts into one shared datastore. Available as OSA or ESA, VCF can use it as principal storage.
- Capacity
A reserved block of compute for a tenant whose size is fixed by its SKU; Fabric F SKUs express it in capacity units (CUs). Workspaces assigned to it unlock features like Copilot, and from F64 upwards people with free licences can view Power BI content.
- Gap
What differs between one state and another; usually this means the difference from the baseline architecture to the target one.
- total_tokens
The usage field that sums prompt_tokens and completion_tokens, for example 37 + 86 = 123. Billing applies to both kinds of token.
- VMware Cloud Foundation
Broadcom's platform for private cloud. It unifies management of NSX, vSAN, vSphere, VCF Automation and VCF Operations as one fleet; VVF, by contrast, lacks automation and cloud management.
- resync
vSAN's repair activity, in which components of objects are rebuilt or relocated so they meet policy again. Causes include device, host or network failure (after the repair delay), maintenance mode, policy edits and rebalancing; watch it under Monitor > vSAN > Resyncing Objects.
- JOIN
Combines rows from two or more tables in one SELECT, most often by pairing a primary key with the foreign key that refers to it.
- DISTINCT
Removes duplicates so that each row appears once; it can be used in a
SELECT, an aggregate or a set operation.