Building Failover Systems with IDT’s PES32NT24G2 PCIe® Switch Application Note AN-716
●Introduction:
■The IDT PES32NT24AG2 PCIe® switch supports a flexible failover mechanism that provides vital functions required for the construction of fault tolerant systems. The failover mechanism consists of the following features:
▲Dynamic switch partitioning
▲Runtime re-configurable upstream/NTB ports
▲Failover Capability structures with automatic reconfiguration
■The switch allows up to eight active switch partitions and each switch partition represents an independent PCIe hierarchy whose operation is independent of other switch partitions. The dynamic switch partitioning supports two forms of dynamic reconfiguration: Each switch port may be dynamically assigned to partitions and the operating mode of a port may be dynamically re-configured without affecting the unrelated switch partitions.
■The switch supports up to eight NTB (Non-Transparent Bridge) endpoint functions that can serve as built-in communication channels for system interconnecting to exchange information among different roots via the inter-domain communication facilities. The NTB endpoint functions can be dynamically enabled and configured to associate with Ports 0, 2, 4, 6, 8, 12, 16, and 20 when these ports are configured to operate in one of the following modes:
▲Upstream switch port with NTB function
▲NTB function
■The PES32NT24AG2 switch provides four Failover Capability structures that can be selected in conjunction with individual partition/port configuration related to failover operations, which features automatic and dynamic reconfiguration for the involved switch partitions and ports upon detection of a predefined trigger from the selected Failover Capability structure.
■There are three failover usage models provided to demonstrate how the failover mechanism can be used to construct applications. Followed by more details in terms of configuring Failover Capability structures, different failover initiations, failover switch events and interrupts, etc. At the end of this document, an example of using the Failover Capability structure is provided with explicit procedures, which represents a complete reference as users adopt the failover mechanism in their applications.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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August 19, 2009 |
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AN-716 |
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485 KB |
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