The correct answers are A. Inline compression before data is written to disks and C. Post-process compression, where data is first written to disks and then read and compressed when the system is idle. Huawei storage systems support both inline compression before data is written to disks and post-process compression, where data is first written to disks and then read and compressed when the system is idle. Inline compression after data is written to disks is not supported.

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.

A and C are true statements about the ports of a Huawei OceanStor all-flash storage device. Bond ports, VLANs, and logical ports are created based on available Ethernet ports, while multiple Ethernet ports of the same controller are bonded to form a bond port to increase the bandwidth. The networks and services between VLANs are physically isolated, which improves the security and reliability of service data. Multiple logical ports can be created for a bond port, but only one logical port can be created for an Ethernet port.

Distributed storage systems are designed to support horizontal scaling, which means adding more nodes to the system to increase both computing capability and storage space. This enables the system to handle large amounts of data and large numbers of users. Distributed storage systems also support storage resource pooling and virtualization, which allows for efficient use of storage resources and easy management of storage.

Deduplication is a data reduction technology that compresses large-size data blocks to reduce the physical storage capacity for storing data, thereby meeting increasing storage capacity requirements. Deduplication can greatly reduce the amount of storage needed to store data, and can also increase the efficiency of data access.

The correct answers are B. Better environmental adaptability, C. Faster read/write speed for random access, and D. Longer service life. SSDs (solid-state drives) offer several advantages over HDDs (hard disk drives), including better environmental adaptability, faster read/write speed for random access, lower power consumption, and a longer service life. SSDs also tend to have smaller form factors, making them ideal for many mobile applications. However, HDDs typically offer larger capacity than SSDs.

Solid-state drives (SSDs) are a type of data storage device that have several advantages over hard disk drives (HDDs).

Better environmental adaptability: SSDs are not affected by temperature, humidity, or altitude changes, and they are more resistant to shock and vibration than HDDs.

Faster read/write speed for random access: SSDs have no moving parts, which means that data can be read and written much faster than on HDDs, especially for random access to small files.

Longer service life: SSDs have no moving parts, so they are less likely to fail due to mechanical issues. They also have a higher maximum read/write cycle than HDDs, which means that they can handle more write operations over their lifetime.

Larger capacity: SSDs are not always have larger capacity than HDDs, it depends on the specific model and brand.

The statements that describe the high reliability of the Huawei OceanStor all-flash storage system are A. It supports clusters consisting of multiple controller enclosures to improve the availability of the storage system, B. Interconnect I/O modules shorten failover time when a controller fails to provide better reliability, as compared with common I/O modules, and D. When a controller fails, l/Os of the faulty controller are redirected to another controller The host is unaware of the fault and services remain running properly. Statement C. Standard I/O modules shorten failover time when a controller fails to provide better reliability, as compared with interconnect I/O modules is false.

The correct answers are A. SmartMigration and D. HyperClone. SmartMigration and HyperClone are features designed to manage storage and do not directly address the performance requirements of online services. SmartTier and HyperMetro are features designed to address performance requirements by tiering storage based on data access frequency and allowing for the replication of data across multiple sites.

A failover group is a combination of ports that are used for IP address failover in a storage system, and IP address failover ensures service continuity and improves the reliability of paths for accessing file systems. IP address failover applies to all storage network architectures, not just IP SAN. Fallback means that the standby port takes over services when the active port fails, and then the active port takes over services again after it recovers.

If a disk is faulty, the process of recovering data on the faulty disk is typically done through a process called reconstruction. Reconstruction involves copying data from a healthy disk in a RAID array to the faulty disk. This can be done through software or hardware RAID controllers. The RAID controller will use the data stored on the other disks in the RAID set to recreate the data that was stored on the faulty disk. This process can be done while the RAID array is online, allowing the RAID to continue functioning while the reconstruction process is taking place. Once the reconstruction is complete, the faulty disk can be replaced and the RAID array can continue to function normally.

A disk domain is a collection of physical disks of the same type and speed. If a disk domain has multiple disk types, it is not necessary that the storage pools within that disk domain have multiple disk types as well. Storage pools are a collection of physical disks within a disk domain that are grouped together to provide storage capacity. The storage pools can be created with different RAID levels and disk types, so it is possible to have a disk domain with multiple disk types and still have storage pools with only one disk type. It depends on how the administrator wants to configure the storage pool and how the storage is used.

Analysis: Both LAN Free and Server Free backup are based on SAN.

LAN Free backup, advantages: low server load, optimized data transmission efficiency; disadvantages: SAN layout fee

High cost, equipment must be compatible with SAN

Server Free backup, advantages: lowest server load, greatly optimized data transmission efficiency; disadvantages: SAN distribution

The cost of installation is high, and the device must be compatible with the SAN, which requires third-party device support.