Cisco Cisco IPCC Web Option Maintenance Manual
WebView and Cisco Unified Intelligence Center (the reporting tools) at the site query historical
data from the HDS rather than directly from the Logger.
data from the HDS rather than directly from the Logger.
Typically, two Administration & Data Servers at a site are set up as primary and secondary
servers to support fault tolerance. The HDS must be configured only on the primary
Administration & Data Server. If the primary Administration & Data Server fails, the secondary
Administration & Data Servers at the site automatically becomes active. (The HDS on the
primary server is still active when this occurs.)
servers to support fault tolerance. The HDS must be configured only on the primary
Administration & Data Server. If the primary Administration & Data Server fails, the secondary
Administration & Data Servers at the site automatically becomes active. (The HDS on the
primary server is still active when this occurs.)
See Also
The "
Historical Data Server (page ?)
" section in Chapter 3, "Working with Databases," provides
more information on setting up an HDS Administration & Data Server.
Simplexed Operation
If you have a simplexed Central Controller configuration, you are vulnerable to a single device
failure (for example, a system failure, process failure, or a disk crash). Have a strategy in place
for keeping daily backups of the central database. Your backup strategy might involve regularly
scheduled backups, mirrored disk configurations, or Redundant Array of Inexpensive Disk
(RAID) configurations. Always have the central database backed up on removable media.
failure (for example, a system failure, process failure, or a disk crash). Have a strategy in place
for keeping daily backups of the central database. Your backup strategy might involve regularly
scheduled backups, mirrored disk configurations, or Redundant Array of Inexpensive Disk
(RAID) configurations. Always have the central database backed up on removable media.
Note: Simplexing is not supported in a production environment.
If the central database becomes unavailable due to disk failure, contact your Unified ICM support
provider. A support representative can assist you in replacing the disk, rebuilding the database,
and restoring the configuration and historical data.
provider. A support representative can assist you in replacing the disk, rebuilding the database,
and restoring the configuration and historical data.
See Also
For more information on database backup and restore procedures for simplexed Central
Controllers, see Chapter 5, "
Controllers, see Chapter 5, "
."
Fault Tolerance in Integrated Deployments
Some components in Unified ICM implement synchronized fault-tolerance, meaning that
communication paths to redundant components are utilized simultaneously. This reduces the
probability of message loss during transition periods to a very low rate. Cisco Media Blender
(MB) nodes do not implement synchronized fault-tolerance; however, duplexed implementations
of these nodes provides a vast improvement over a single path setup. The Unified WIM and
Unified EIM documentation describes general recovery behavior and its effects when a single
node failure occurs in an integrated deployment. Although multiple failures are not considered,
an instance of multiple node failure will manifest itself as a superposition of single failure cases.
However, a catastrophic failure can occur if all redundant components in an array fail (for
example, if all routing servers fail).
communication paths to redundant components are utilized simultaneously. This reduces the
probability of message loss during transition periods to a very low rate. Cisco Media Blender
(MB) nodes do not implement synchronized fault-tolerance; however, duplexed implementations
of these nodes provides a vast improvement over a single path setup. The Unified WIM and
Unified EIM documentation describes general recovery behavior and its effects when a single
node failure occurs in an integrated deployment. Although multiple failures are not considered,
an instance of multiple node failure will manifest itself as a superposition of single failure cases.
However, a catastrophic failure can occur if all redundant components in an array fail (for
example, if all routing servers fail).
Note: For detailed information about Unified WIM and Unified EIM fault tolerance, refer to
the Cisco Unified Web and E-Mail Interaction Manager, Solution Network Reference Design
the Cisco Unified Web and E-Mail Interaction Manager, Solution Network Reference Design
Administration Guide for Cisco Unified ICM/Contact Center Enterprise & Hosted Release 8.x
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Chapter 2: Fault Tolerance
Simplexed Operation