Selecting the Backup Unit

2 Initial Configuration

•If more than one stack Master is selected using the Master/Slave push button on the switch’s front panel, the system will select the unit with the lowest MAC address as the Master.

•If the Master unit fails and another unit takes over control of the stack, the unit numbering will not change.

•If a unit in the stack fails or is removed from the stack, the unit numbers will not change. This means that when you replace a unit in the stack, the original configuration for the failed unit will be restored to the replacement unit.

•If a unit is removed from the stack and later reattached to the stack, it will retain the original unit number obtained during stacking.

•If a unit is removed from the stack, and powered up as a stand-alone unit, it will also retain the original unit number obtained during stacking.

Once the Master unit finishes booting up, the Slave unit with the lowest MAC address will be selected from the stack as the primary backup unit. The stack Master immediately downloads all configuration information to the backup unit, and continues to update the backup unit with information about any subsequent configuration changes made to any unit in the stack. If the Master unit fails or is powered off, the backup unit will take control of the stack without any loss of configuration settings.

The Slave unit with the lowest MAC address is selected as the Backup unit. If you want to ensure a logical fail over to next unit down in the stack, place the Slave unit with the lowest MAC address directly beneath the Master unit in the stack.

Recovering from Stack Failure or Topology Change

When a link or unit in the stack fails, a trap message is sent and a failure event is logged. The stack will be rebooted after any system failure or topology change. It takes two to three minutes to for the stack to reboot. If the Master unit fails, the backup unit will take over operations as the new Master unit, reboot the stack, and then select another backup unit after the stack finishes rebooting. Also note that powering down a unit or inserting a new unit in the stack will cause the stack to reboot. If a unit is removed from the stack (due to a power down or failure) or a new unit added to the stack, the original unit IDs are not affected after rebooting, and a new unit is assigned the lowest available unit ID.

Broken Link for Line and Wrap-around Topologies

All units in the stack must be connected via stacking cable. You can connect the units in a simple cascade configuration from the top to the bottom unit. Using this kind of line topology, if any link or unit in the stack fails, the stack will be broken in two. The Stack Link LED on the unit that is no longer receiving traffic from the next unit up or down in the stack will begin flashing to indicate that the stack link is broken.

When the stack fails, a Master unit is selected from the two stack segments, either the unit with the Master button depressed, or the unit with the lowest MAC address if

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ES4649, ES4625 specifications

The Microsoft ES4625 and ES4649 are advanced enterprise-grade servers designed to meet the demands of modern data centers. They blend cutting-edge technology with robust performance, making them an ideal choice for businesses that require reliable processing capabilities, enhanced storage solutions, and improved energy efficiency.

One of the standout features of the ES4625 is its powerful processing capability. Equipped with the latest Intel Xeon Scalable processors, the server can handle a significant workload, making it suitable for various applications, including virtualization, cloud computing, and big data analytics. The multi-core architecture allows for efficient parallel processing, thereby improving response times and overall system performance.

On the other hand, the ES4649 offers an even more powerful setup, with the option to support high core counts and a larger memory footprint. This feature is particularly beneficial for enterprises that run demanding applications requiring substantial processing power and memory capacity. Both models support DDR4 memory, ensuring faster data access and overall system efficiency.

Storage adaptability is another key characteristic of these servers. The ES4625 and ES4649 come with multiple drive bays supporting various storage options, including SSDs and traditional HDDs. This flexibility allows organizations to configure their storage according to their specific performance and capacity needs. With support for advanced storage technologies like NVMe, enterprises can achieve unparalleled data transfer speeds, which is crucial for data-intensive applications.

In terms of manageability, both models are equipped with Microsoft’s innovative management tools. The integration of these tools facilitates easy monitoring, troubleshooting, and maintenance of server health and performance, significantly reducing downtime. Moreover, the servers are designed with enhanced security features to protect against unauthorized access and data breaches, ensuring that sensitive information remains secure.

Energy efficiency is another critical characteristic of the ES4625 and ES4649. These servers are designed with power-saving technologies that reduce energy consumption without compromising performance. This aspect is particularly advantageous for businesses looking to lower their operational costs and carbon footprint.

Overall, the Microsoft ES4625 and ES4649 offer a compelling combination of performance, flexibility, and security. They are engineered to support the increasingly complex demands of modern enterprise environments, making them a valuable investment for organizations seeking reliable, high-performing server solutions. Whether for virtualized workloads, cloud services, or heavy data computations, these servers are designed to deliver exceptional results.

Microsoft ES4625 Selecting the Backup Unit, Recovering from Stack Failure or Topology Change

Models: ES4649 ES4625

2 Initial Configuration