15.00 - 15.10 - Smaller Cluster Configuration - Teradata Database

Teradata Database Introduction to Teradata

Teradata Database
Release Number
Content Type
User Guide
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English (United States)
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The following figure illustrates smaller clusters. Decreasing cluster size reduces the likelihood that two AMP failures will occur in the same cluster. The illustration shows the same 8-AMP configuration now partitioned into 2 AMP clusters of 4 AMPs each.

Compare this clustered configuration with the earlier illustration of an unclustered AMP configuration. In the example, the (primary) data on AMP3 is backed up on AMPs 1, 2, and 4 and the data on AMP6 is backed up on AMPs 5, 7, and 8.

If AMPs 3 and 6 fail at the same time, the system continues to function normally. Only if two failures occur within the same cluster does the system halt.

Subpools are logical groupings of AMPs and disks for fault-tolerance. In a single-clique system to ensure that a disk failure will not bring down both AMPs in a cluster, disks and AMPs are divided into two subpools, and clustering is done across the subpools.