and whether the RAID is in a normal or degraded state. You can determine the effect of disk removal/failure by looking at the Hotplug Indicator on the Disks page. If this indicator is GREEN, disk removal/failure will have no effect on the RAID. If this indicator is YELLOW, disk removal/failure will cause RAID degradation, but you will still be able to access all the data. If the indicator is RED, disk removal/failure will cause the entire RAID to fail.

For example, in a RAID 5 configuration, all the disks are YELLOW. Removing any one of them will cause the RAID to be degraded, but all the data will still be available. However, after you remove one disk, all the other disks become RED, since removing any one of them at this point will cause the entire RAID to fail.

Note: In a linear configuration, the Hotplug Indicator is RED for all the disks because removing any one of them will remove data from the storage system. However, this will not adversely affect any of the other disks.

In addition, while a disk is being rebuilt, all the other disks are RED, since removing any one of them at this point will cause the RAID to fail.

If you remove a viable disk and cause only RAID degradation, you can re-install the same disk and resume normal operation. (For information about adding a disk, refer to Adding hard disks.)

Note: If you remove two or more disks, you must re-install them in the reverse order to help maintain data integrity. For example, if you remove disk A from slot 1 and then remove disk B from slot 2, you must re-install disk B first, then disk A. You can put the disks back into different slots, but they must be re-installed in the opposite order from which they were removed.

If you remove one or more viable disks and cause the entire RAID to fail, you can shut down the storage system, re-install the same disks, and then restart the storage system. As long as you re-install the original disks, the storage system should be able to resume proper operation, although the integrity of the data cannot be guaranteed. However, if you replace the removed disks with new disks, you must reconfigure your disks.

Warning: Reconfiguring your disks will delete all the data on your storage system.

Responding to RAID degradation

When disk removal/failure causes RAID degradation, the Disk Change Notification page appears when you access the Manager or refresh the browser window (Figure B-4).

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Freedom9 4020 user manual Responding to RAID degradation
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4020 specifications

The Freedom9 4020 is a cutting-edge network interface device designed for a variety of applications, ranging from home use to small business environments. This versatile device is praised for its robust performance, extensive connectivity options, and user-friendly features, making it an excellent choice for those seeking a reliable network solution.

One of the standout characteristics of the Freedom9 4020 is its advanced wireless capabilities. It supports dual-band Wi-Fi, allowing users to connect to both 2.4 GHz and 5 GHz frequencies. This feature ensures optimal performance by minimizing interference and maximizing speed, making it ideal for high-bandwidth tasks such as streaming and gaming.

In terms of connectivity, the Freedom9 4020 is equipped with multiple Ethernet ports, enabling wired connections for devices that require stable and fast internet access. These ports support Power over Ethernet (PoE), which simplifies installation by eliminating the need for separate power supplies for each connected device. This is particularly beneficial in settings where devices like IP cameras or VoIP phones are deployed.

Another key feature is the device's support for advanced security protocols. The Freedom9 4020 utilizes WPA3 encryption, providing enhanced protection for connected networks. This is crucial in today’s environment, where cybersecurity threats are increasingly prevalent. The device also includes features like a built-in firewall and VPN support, enabling secure remote access for users.

The Freedom9 4020 is designed with scalability in mind. Organizations can seamlessly integrate it into existing networks and expand as their needs grow. This flexibility makes it suitable for various applications, from home automation systems to small business networks.

The user interface is intuitive, featuring a web-based management platform that allows users to monitor and control their network easily. This system provides real-time insights into network performance, making troubleshooting straightforward.

Overall, the Freedom9 4020 stands out as a versatile and powerful networking solution. With its robust wireless performance, extensive connectivity options, strong security features, and user-friendly interface, it meets the demands of modern users looking for reliability and efficiency in their network devices.
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