ZXTM GLB 2.1 -> 13th September 2007
===========================================================

ZXTM GLB 2.1 is a major revision of the ZXTM GLB product family,
containing functionality and stability improvements and bug fixes.
Customers are recommended to upgrade to the new version to take
advantage of the changes.

Platform Availability for ZXTM GLB 2.1
--------------------------------------

* Linux: x86, x86_64 (Kernel 2.6.8+)
* Solaris 10: x86, x86_64 & SPARC
* FreeBSD 6.1+: x86

New features in 2.1
-------------------

- Monitoring User

  A new user has been added to allow access to the map display
  without having access to make changes to the configuration
  of the product. This user may be enabled and disabled by the
  administration user.

- Removing machines from a cluster

  It is now possible to forcibly remove a machine from a cluster
  and optionally remove its configuration.

- Graphing per machine

  It is now possible to graph all available values for individual
  or sets of machines.

- Online Help

  An online help system has been added, providing context sensitive
  help for the section of the administration interface that the
  user is currently viewing.


Other changes in 2.1
--------------------

- Improved memory behavior in client browsers

  Many improvements have been made to ensure that browsers do not
  leak memory when rendering the administration interface.

- E-mail improvements

  E-mail settings are now applied only to a single datacenter rather
  than to all datacenters.

- Configurable Bind IPs

  For operational reasons it may be desirable for ZXTM GLB to bind
  to a single IP address. It is now possible to configure which
  IPs an instance of ZXTM GLB binds to.

- Configurable Port Settings

  It is now possible to configure the port on which the ZXTM GLB
  will listen for incoming DNS traffic. It is also possible to
  configure the port on which the administration interface is
  available.


ZXTM GLB 2.0 -> 28th June 2007
===========================================================

ZXTM Global Load Balancer provides datacenter load balancing and
failover by managing DNS responses.  Clients are directed to the
optimal datacenter based on availability, performance
and geographic proximity.

This is the first public release of ZXTM GLB.


Key Features in ZXTM GLB 2.0
--------------------------------

GLB Services:
   It is possible to specify different settings for each group of
   domains that are being handled. TTLs, health monitoring and load
   balancing may all be set independently.

Load Balancing:
   ZXTM GLB uses datacenter availability, performance and
   geographic location to determine the appropriate destination
   datacenter for each client request.  Load balancing may be
   entirely performance driven, location driven, or a varying
   combination of both.

Active-Passive Configuration:
   You may configure the order in which datacenters provide backup for
   each other. It is also possible to prevent automatic recovery,
   which is important for stateful web applications.

Monitoring:
   A catalog of monitors is provided to aid management of multiple
   monitors. A variety of monitor types are supported, including
   DNS, ping monitors and HTTP-based monitors. These may be applied to
   any GLB service and as many monitors as required may be applied.

SOAP API:
   Through the provided SOAP interface, it is possible to write
   external daemons to inform ZXTM GLB about the load of each
   datacenter. It is also possible to set the appropriate machine as
   the active machine to help with scripting disaster recovery.

Visualization:
   There is a rich set of visualization tools to help analyze the
   performance and operation of your services. To visualize the
   geographic distribution of requests, the map page will show in
   real-time the locations where requests came from. To visualize
   the rates of requests you can interactively view graphs of the
   current activity and for a longer term view you can view graphs
   of historical activity.


Supported Platforms
-------------------

ZXTM GLB 2.0 can be installed on the following platforms:

 * Linux (x86, x86_64)

Web browser support (for the online administration interface):
The following browsers have been tested with ZXTM GLB:

 * Firefox 1.5+
 * Internet Explorer 7