Starter Web Availability Fault Tolerance


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I'm now working for a startup out of Boston and we're in discussions
about server availability so that we can sustain outages for like 4
hours, and also handle higher web traffic. What is a starter web
availability system that you would recommend, and is there anything
"canned" out there that makes this easier to setup and test? We want
to get this going separately like a lab, and then when it all works,
we start doing limited cutover testing to see if we can move to
this.
Currently we spend around $2500 per day in advertising, and
have a $20 transaction coming across our single server every minute to
3 minutes, sometimes even triple that.
Note -- I love cPanel, and
hav
I'm now working for a startup out of Boston and we're in discussions
about server availability so that we can sustain outages for like 4
hours, and also handle higher web traffic. What is a starter web
availability system that you would recommend, and is there anything
"canned" out there that makes this easier to setup and test? We want
to get this going separately like a lab, and then when it all works,
we start doing limited cutover testing to see if we can move to
this.
Currently we spend around $2500 per day in advertising, and
have a $20 transaction coming across our single server every minute to
3 minutes, sometimes even triple that.
Note -- I love cPanel, and
hav
Linux
AceMesh announces affordable solutions and services for customers
seeking high availability, fault-tolerance and scalability. />AceMesh offers DRBD in combination with Corosync Cluster Engine for
customers. This allows customers to start with at least two servers
with one server acting as primary database and both servers acting as
web servers. When the primary server for database is down, corosync
cluster engine will automatically mount and start all necessary
services on the secondary, which usually takes a few seconds. With
DRBD, you can run any popular database ( MySQL, PostgreSQL) and
achieve fault-tolerance and high availability for your websites on
Joomla, Wordpre
Web Hosting
Managed Dedicated Servers: High Availability, Fault Tolerance
& Linear Scalability with DNS Fail-over support.
AceMesh
Provides multiple options to achieve high-availability infrastructure
for your business. This includes DRBD clusters as well as Cassandra
Clusters, as well as using cloud technologies.
Even if you do not
need high-availability right now, but looking for affordable managed
servers with the best price/performance ratio to start with, we
present the best deals suitable for your budget.
For high
availability, fault tolerance & linear scalability, we will setup
DRBD based clustering as well as cassandra based clustering on
Web Hosting
Managed Dedicated Servers: High Availability, Fault Tolerance
& Linear Scalability with DNS Fail-over support.
AceMesh
Provides multiple options to achieve high-availability infrastructure
for your business. This includes DRBD clusters as well as Cassandra
Clusters, as well as using cloud technologies.
Even if you do not
need high-availability right now, but looking for affordable managed
servers with the best price/performance ratio to start with, we
present the best deals suitable for your budget.
For high
availability, fault tolerance & linear scalability, we will setup
DRBD based clustering as well as cassandra based clustering on
Web Hosting
Managed Dedicated Servers: High Availability, Fault Tolerance
& Linear Scalability with DNS Fail-over support.
AceMesh
Provides multiple options to achieve high-availability infrastructure
for your business. This includes DRBD clusters as well as Cassandra
Clusters, as well as using cloud technologies.
Even if you do not
need high-availability right now, but looking for affordable managed
servers with the best price/performance ratio to start with, we
present the best deals suitable for your budget.
For high
availability, fault tolerance & linear scalability, we will setup
DRBD based clustering as well as cassandra based clustering on
Web Hosting

I've heard claims from a vSphere server administrator that VMs
configured for high availability continue to transparently function
even in the event of an ESXi host failure. He also claims VMs
configured for high availability cannot be snapshoted because that
causes VM corruption.



To the best of my understanding, and from what I found online
that's not true.




  1. HA (high availability) VMs are restarted on failure, they don't
    transparently continue to function.

  2. FT (fault tolerant) VMs transparently continue to function.

  3. You can snapshot an HA VM but not an FT VM.



So, I'm a bit confused. What exactly are the benefits and
limitations of HA and FT?

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