Huawei H13-611 Practice Test - Questions Answers, Page 51

In a Direct Attached Storage (DAS) system, the storage and host are connected in a one-to-one relationship. This means that there is a single host and a single storage device, which are both connected directly to each other. This type of storage system is often used when a single host needs access to a large amount of storage, such as in a server or large workstation.

In storage, a hot spare is a spare disk that is pre-configured and ready to be used to rebuild data in the event of a disk failure in a RAID array. When a disk failure occurs in a RAID array, the data that was stored on the failed disk is rebuilt using the data from the remaining disks and the hot spare. The rebuild process is done automatically by the RAID controller, and it is done in a way that does not disrupt the normal operation of the RAID array. The hot spare disk is usually kept in a powered-on and ready state, so that it can be used immediately in case of a disk failure. It is also known as "hot spare disk" or "hot spare drive".

In order to add additional controllers to an existing HUAWEI OceanStor system, a FC (Fibre Channel) or iSCSI (Internet Small Computer System Interface) Host Bus Adapter (HBA) is required. The HBA connects the controller to the storage devices, and it is required to add additional controllers to the system. The HBA provides the interface between the controller and the storage devices, and it allows the controller to communicate with the storage devices over the FC or iSCSI protocol. Other options such as SAS cabling, 56 Gb Infiniband module, and Smart I/O card are also important components in storage systems, but they are not directly related to adding additional controllers to an existing HUAWEI

OceanStor system.

The most widely used Fibre Channel (FC) topology is the FC Switched Network. This topology uses a centrally managed switch to create a network of connected devices, allowing them to communicate with each other. This type of topology is highly scalable, as additional devices can be added to the network without any reconfiguration. It also provides higher performance than other topologies, as it can route data more quickly and efficiently.

Storage virtualization does not enable servers to directly access storage hardware. Instead, it creates a virtual layer between the physical storage devices and the servers, allowing the servers to access the storage devices through a single interface. This virtual layer also allows the storage devices to be centrally managed, and can be used to reduce the limitations of physical storage capacity and hide the complexity of physical devices.

If there are writes to the source LUN during a snapshot rollback, the rollback is performed before the writes are complete. This means that any data written to the source LUN during the snapshot rollback will be lost, since it will be overwritten by the snapshot data.

SmartMotion is a feature in Huawei storage systems that can be used to periodically detect and migrate hot data from the capacity tier to the high-performance tier. This helps improve the storage system's performance and reduce costs. The other answers are all features of Huawei storage systems, but they are not related to data migration.

Quality of Service (QoS) is a set of technologies used to ensure that network traffic is allocated resources according to predetermined priorities. The three main working principles of QoS are I/O Priority Scheduling, I/O Performance

Assurance, and I/O Flow Control. I/O Latency Burst is not one of the working principles of QoS.