When a secondary host stops answering over the management network, the HA primary looks at shared heartbeat datastores to tell a dead host apart from one that is merely cut off or partitioned.
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In the Ultra Transcenders books
Each book explains Datastore heartbeating in context, with comparison tables and the common traps.
Terms in this definition
- Secondary host
Every host in a vSphere HA cluster apart from the elected primary. Each reports its status to the primary, which keeps an eye on it and, should it fail, restarts its VMs on other hosts.
- 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.
- management network
Carries traffic between an ESX host and vCenter, along with other management traffic. From the DCUI, Configure Management Network lets an administrator change its VLAN, addressing, name servers and NICs.