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To me it seem like the LG dual controller transmits the input over internet between the devices? So it is not possible to have only one device powered on? I read somewhere it simulates a KVM switch but this would mean I can chose to which device the mouse and keyboard go independently from each other but this is not possible, right?

Imagine if both controllers are dead at the same time or say after an hour of the first failure both controllers are pronounced completely dead / failed. What will or how will I recover the data on it ?

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Hi, probably way too late to answer this but I suspect in this scenario you would have to assign the new controller ID as having ownership of the disks then tweak some settings but essentially it would be the standard controller / head replacement procedure. After all a single head unit does not lose data in the event of a controller replacement.

As the systems I am used to are either active/active or active/passive dual controller I am sure you can see why I am getting confused in netapp world as active/active seems to be two arrays clustered together..???...

I will start with the Data ONTAP 7.2.x and 7.3.x families. Here we use the term active/active configuration for a single system with two storage controllers. Each controller normally serves its own data. If one controller fails, the partner controller takes over and serves both its own data and the data for the partner. Physically, the two controllers are connected to each other. Each controller also has one or more connections to its own disks and to its partner's disks.

Note that we are no longer restricted to a pair of storage controllers. You can scale the Data ONTAP 8 cluster to include more controllers as needed. However all of the controllers are still active and available to serve data.

If you order a storage system with two controllers (there are applications where a single-controller configuration is adequate), the "default" would be that you have an active/active configuration or cluster. However, you need to be sure everything is configured correctly so that the system can fail over between controllers successfully.

So if I buy a FAS3140 (for example) with two controllers (active/active?) I will need to configure the system so that each controller can take over from the other in the event of a failure? How do I do this, is there some documentation you can point me at?

So assuming you can access the NetApp Support site, the basic cabling (such as connecting both controllers to both sets of disk shelves) is covered in the FAS31xx/V31xx System Installation and Setup flyer ( -03554+D0.pdf).

The term DataONTAP 8.0 Cluster-Mode is used with an actual cluster of two seprate storage systems and DataONTAP 8.0 7-Mode is used in a configuration with a single storage array with two controllers?

I would like to add that the term "active/active" means different things to different people & vendors. Coming from the fibre channel world, I would not classify a NetApp filer running OnTap 7.x as truly "active/active". A NetApp LUN resides inside a volume that is owned by a single controller. The filer supports ALUA (asymmetrix logical unit access), which basically tells the FC-connected host which NetApp controller's FC port(s) to access the LUN on. There is an "optimized" path, and a "non-optimized" path. If a host tries to access a NetApp FC LUN via the other NetApp controller, the filer will send out an autosupport and complain about the potential problem. With ALUA, there are no significant consequences of accessing a LUN through the wrong controller, though performance may be slightly degraded. If an "active/active" NetApp filer loses a controller, the volumes that reside on that controller remain accessible via the other controller. Though the controllers are connected internally, they controllers are still seen in many ways as separate controllers (they even each have their own separate host names and OS volumes).

I am having a HPE MSA 2050 storage with two volumes, and one for each controller. We had an incident in the server room, and one controller lost power for about 15 seconds. And after the incident we find a lot of database server has inconsistant status on the log files, and some virtual server files corrupted.

I am wondering is this type of Storage has the function of failover on the dual controller? Or if there is any configuration wrong for the storage? - I don't find any place to setup the failover for this.

Volume availability depends upon how you have presented the volume to host. To be specific if volume presented to host with all Host ports or some host ports of both controllers or not. If not then volume will not failover successfully and you will face outage. Technically multi-path need to be configured from Host to both controllers of MSA

In the case of a direct attach configuration, the best practice is to have at least two connections to the array for each server. In the case of a direct

attach configuration with dual controllers, the best practice is to have at least one connection to each controller.

Dual battery packs deliver an impressive 22+ hours of battery life per pack and eliminate the need for environmentally harmful, disposable batteries. And, four total replacement battery doors are included, two for Xbox One controllers, and two for Xbox Series X|S controllers.

Connect the TL-R1620Sdc to a dual-controller QNAP NAS and create a redundant cross loop configuration that provides expansion units with redundant paths to the base NAS and protection between JBOD connections. If one or more paths to the TL-R1620Sdc disconnect, other expansion units can still communicate with the base NAS. This is essential for intermachine data protection and capacity scalability for uninterrupted mission-critical enterprise tasks.

The TL-R1620Sdc is powered by a low-power 28nm SAS35x28R SAS Expander and supports 12/6 Gb/s SAS/SATA drives. Both controllers have three Mini-SAS HD (SFF-8644) ports, and each SAS wide port combines four SAS 12Gb/s channels for up to 48Gbps bandwidth.

A storage controller is the nucleus of any storage system. It acts as a bridge between the storage devices and the servers, managing data storage and retrieval. These controllers come in various configurations, including single controller setups, dual controllers, and multicontroller systems, each tailored to different requirements.

A dual controller is a configuration where two storage controllers operate in tandem. Working collaboratively, they manage multiple devices, ensuring a robust and fail-safe storage environment. The primary purpose of dual controllers is to provide redundancy and high availability, minimizing the risk of data loss in case of a controller failure. This setup guarantees continuous operation, even during maintenance or upgrades.

Dual controllers significantly enhance operational efficiency by distributing the workload effectively. In this setup, tasks are shared between two controllers, preventing bottlenecks and ensuring swift data processing. This improved workload distribution translates to faster response times, allowing businesses to handle larger volumes of data seamlessly.

As an example, a multinational financial institution could implement dual controllers in its data center to improve workload distribution, reduce data processing times, and enable real-time transactions during peak hours.

One of the standout advantages of dual controllers lies in their ability to minimize downtime. In a dual controller setup, if one controller fails, the second controller seamlessly takes over without interrupting ongoing operations. This rapid failover mechanism ensures continuous access to data and applications, even during maintenance or unforeseen hardware failures.

Data integrity is paramount in any business. Dual controllers provide built-in redundancy, safeguarding data against potential loss. With mirrored data and failover capabilities, businesses can rest assured that their critical information is protected. This enhanced reliability instills confidence in both customers and stakeholders.

Dual controllers can be categorized as either hardware-based or software-based. Hardware-based controllers come as integrated systems, offering dedicated processing power and optimized performance. Software-based controllers, on the other hand, utilize existing hardware resources, making them a cost-effective option. The choice between hardware- and software-based dual controllers depends on factors such as budget constraints and performance requirements.

Active-active dual controllers leverage both controllers simultaneously, distributing the workload evenly between them. This configuration optimizes performance and ensures high availability by allowing both controllers to actively manage the storage system. Active-active setups are ideal for applications requiring constant data availability and rapid response times. 2351a5e196