Cache Size for 650F and 651F Storage Systems

Although you can configure cache page sizes of 2 kilobytes (KB), 4 KB, 8 KB, 16 KB, and 32 KB, Dell recommends that you set the cache page size to 8 KB for optimum performance of your PowerVault 650F and 651F storage systems.

Setting the Execution Throttle

In a SAN configuration with three or more servers, you must change the default exe- cution throttle value in the nonvolatile random-access memory (NVRAM) for each host bus adapter (HBA). For information about calculating and setting the execution throt- tle, see “Setting the Execution Throttle Value for SAN Servers Connected to 650Fs, 651Fs, 660Fs, and 530Fs” in Chapter 10.

Setting the PowerVault 650F and 651F Cache Water Mark

To properly tune the Dell PowerVault 650F and 651F storage system, you need to set the high water mark (HWM) and low water mark (LWM) cache value to an appropriate value. Normally, Flare clears the cache any time it is idle and any time it reaches 100% of capacity.

HWM and LWM settings reflect the values at which the cache automatically clears its contents. The default HWM setting of 96 and the default LWM setting of 80 tell Flare to start clearing cache when it reaches 96% of its capacity and stop clearing when it reaches 80% of capacity. The values of 96 and 80 make more efficient use of available memory.

Use the following procedure to verify and change the HWM and LWM settings.

1.Using the Dell OpenManage Data Supervisor or Dell OpenManage Data Adminis- trator Array Configuration menu, select Array—> Set Watermark/High Watermark.

2.Enter the value of 96 for the High Watermark, and click OK.

3.When the watermark setting confirmation window opens, click OK.

4.In the Array Configuration menu, select Array—> Set Watermark—> Low Watermark.

5.Enter the value of 80 for the Low Watermark, and click OK.

6.When the watermark setting confirmation window opens, click OK.

support.dell.com

SAN Performance Tuning 17-3

650F, 651F specifications

The Dell 651F and 650F are notable entries in the Dell family of networking switches, designed to meet the increasingly demanding requirements of modern enterprises. Built to enhance network performance and reliability, these switches embody a variety of features and technologies that cater to both small businesses and large organizations.

At the heart of the Dell 651F and 650F is their robust hardware architecture. Both models come equipped with high-performance processors, enabling them to efficiently handle substantial data traffic. The Dell 651F features a higher port density compared to the 650F, making it ideal for environments where connectivity and bandwidth are critical. Each switch supports multiple 10G and 25G SFP+ ports, providing flexibility for organizations that require scalable network solutions.

One of the standout characteristics of these switches is their advanced Layer 3 routing capabilities. This feature allows for more precise traffic management, enhancing overall network efficiency. Additionally, both models support various routing protocols, including OSPF, BGP, and RIP, enabling them to seamlessly integrate into existing IT infrastructures.

Security is a primary concern for any organization, and Dell has taken significant measures to address it in the 651F and 650F switches. They support 802.1X authentication and have built-in Access Control Lists (ACLs), helping to safeguard sensitive data while preventing unauthorized access. Furthermore, both models are compliant with various industry standards, ensuring that they can protect networks against emerging threats.

Management and monitoring features also play a crucial role in the functionality of these switches. The Dell Networking OS provides an intuitive interface, which simplifies configuration and management tasks. With features like simple command-line interface (CLI) access and a web-based GUI, network administrators can easily troubleshoot and optimize performance.

In terms of power efficiency, the Dell 651F and 650F are designed with energy-saving technologies that minimize operational costs. They support Power over Ethernet (PoE), allowing for the connection of various devices without the need for separate power sources.

In conclusion, the Dell 651F and 650F switches represent a powerful combination of performance, security, and efficiency. Their advanced features, versatile connectivity options, and user-friendly management tools position them as an excellent choice for organizations looking to enhance their networking capabilities. As businesses continue to evolve and demand more from their technology, Dell’s offerings remain ready to meet those needs.