HAST would not be hard to do in illumos.  But the trick is failure modes. 

In practice you can choose latency or consistency.  

Modern times ha clustering is fine locally with shared storage clusters using 
eg shared SAS or iscsi.  But you still need something like zfs send recv for 
DR.  

There are no silver bullets.  If you think your Linux config is one then you 
haven't done the full failure analysis. 

Realistically HA is almost always best done at the app level rather than the 
OS.   Because there is no magic when we're taking about commodity hardware. 

Sent from my iPhone

> On Dec 23, 2014, at 2:15 PM, Miles Fidelman via illumos-discuss 
> <[email protected]> wrote:
> 
> It really is a pain.
> 
> In the Linux world, Xen or KVM + DRBD + Pacemaker + CRM gives you a 
> relatively painless HA cluster.
> In the BSD world, there's HAST + CARP get you pretty far along the same path.
> But there's nothing equivalent in the illumos world (Xen is pretty thin too).
> 
> Kind of a large gap when it comes to using illumos in any kind of production 
> environment.
> 
> Miles Fidelmn
> 
> -- 
> In theory, there is no difference between theory and practice.
> In practice, there is.   .... Yogi Berra
> 
> 
> 
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