vSphere 5.1 HA / FT technical difference

Hello guys,.

I'm new in 5.1 HA/FT and I am trying to understand more about this technology.

Nevertheless, I surfed the internet and VmWare site for details, I still need clarification and confused.

1)

Technically speaking (not logical: HA: fast recovery, FT: continuous availability), what it the difference between the HA and FT?

I understand that for both the solution all VM in a host are replicated in a second host.

HA: if VM or host fails, the virtual machine is restarted on another host (this means that duing the <>VM slave operation is turned off?)

FT: here there is something more, communication between same hosted VM in different hosted. Thus,.

(a) this means that in this case all VM are for guests?

(b) what failure: turn on the virtual machine (secondary) in the other host: so, this means that the secondary virtual machine is always online?

2)

In addition, when you look at some pictures that describe how they work, I don't understand why they are different.

3)

When using SQL Server 2008, I think it is possible to adopt vSphere HA/FT as a method of clustering (thus using VM) instead of use the machine level failover clustering. Is this true?

4)

You have an image that represent the HA/FT architecture with some applications and SQL Server.

Thank you very much for your support.

FastTrack wrote:

Thank you very much for you reply:

So to sumup:

(1) in the case of SQL Server high availability: using VSpere 5.1 HA/FT is not the right solutions? This means to use the feature Cluster from Microsoft?

use the MS cluster

(2) when you write... do you mean for the two technologies: HA and pi?

everyone uses HA

nobody uses FT (or almost)

(3) tell you that FT do not support more than 1 vCPU. But if I'm not mistaken, I've read that 5.1 support more than 1 vCPU. Fix?

http://www.VMware.com/PDF/vsphere5/R51/vSphere-51-configuration-maximums.PDF

still 1 cpu per FT vm

4) .... Loosely coupled servers... Please could you detailed?

Thank you very much

Tags: VMware

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