L-Ess Cluster Functional Description - Cisco ASR 5000 Series Installation And Administration Manual

Veritas Cluster Installation and Management

L-ESS Cluster Functional Description

L-ESS clustering application provides the support to two discreet L-ESS servers for retrieving and storing xDRs from
the chassis at a distribution node on a single IP address/network element for the billing system.
Both the L-ESS nodes (L-ESS1 and L-ESS2) are configured identically from the standpoint of the retrieval and storage
of the xDRs to support the following:
 The active L-ESS (either L-ESS1 or L-ESS2) is configured to retrieve xDRs from any and all local chassis in
pre-defined intervals and the xDRs are stored on shared disk (between active and standby) by the active so that
whenever active goes down and standby takes over, it has access to fetched data as data is on the shared disk.
 The directory structure of both L-ESS1 and L-ESS2 is identical and conform to the carrier standards. A
/fetched_data directory under <less_install_dir>/ess is used to store initial retrieval of the xDRs from the
chassis.
From a process flow perspective, the interaction of the clustered L-ESS and the ECS is as follows:
 The L-ESS(s) is statically configured with chassis to pull xDRs.
 The chassis continually generates and groups individual records into xDRs, which are marked as a 'closed' xDR
file based on pre-defined criteria.
 The active L-ESS uses SFTP to access the chassis and retrieve all closed xDRs for storage in the /fetched_data
directory.
 Active L-ESS fetches xDR files for eventual retrieval by the billing system.
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Cisco ASR 5000 Series External Storage Server Installation and Administration Guide ▄
L-ESS Cluster Functional Description ▀
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