Hello guys,
I am new in 5.1 HA/FT and I am trying to understand more about this technologies.
Neverthless I have surfed the internet and VmWare site for more details, I still need more information and confused.
1)
Tecnically speaking (not logical: HA: rapid recovery, FT: continuous availability), what this the difference between HA and FT?
I have understood that for both the solution all VM in a host are replicated in a second host.
HA: if VM or host fail, the VM is restarted in the other host (it means that duing operation the <slave> VM is off?)
FT: here there is something more, communication between same VM hosted in different hosted. So,
a) it means that in this case all VM are up for all Hosts?
b) When failure occur: the VM (secondary) in the other host is activate: So it means that teh secondary VM is always online?
2)
What's more, when looking some pictures that describe how they work, I do not understand why they are different.
3)
In case of using SQL Server 2008, I think that is possible to adopt vSphere HA/FT as clustering method (therefore using VM) instead of using machine level failover clustering. Is it true?
4)
Do you have any picture that represent the HA/FT architecture with some applications and SQL Server.
Many thanks for your support.