GTM instead of LTM HA
I'm looking at deploying a new environment with dedicated 6900 LTMs and have concerns about the single point of failure they represent in an HA config. Sure it's "HA" and it's two machines, but it's still one heartbeat etc, and I've had issues with this causing singificant issues on 6400's over the previous few years.
The environment will potentially contain up to 100 web servers serving up to 500,000 live media streams, backed by a clustered caching layer and an Oracle RAC data store. all other areas scale nicely, but putting a single pair of LTM's in front of all of it worries me. As such I was thinking about using GTM to provide two pairs, or two 6900's in the same environment with each LTM instance holding connectivity to half of the servers behind. I've plans to use iControl for these web servers to automatically register into appropriate pools and such, so am comfortable about most of the possible downsides here.
Any thoughts on this would be appreciated, in order to improve the theoretical and practical resilience of the environment.