H13-611_V4.5 Questions and Answers

Analysis: RAID 5 is an improved version of RAID 3 that uses striping and calculates parity information.

Analysis: RAID 5 has a write penalty. In RAID 10, there is no write penalty when writing randomly, and the performance advantage is obvious. No

Have read punishment.

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.

Analysis: Synchronous remote replication is suitable for disaster recovery in the same city, which has high network requirements, but the amount of data loss (RPO) can be 0

Resolution: When Thin LUN is created, an initial allocated capacity can be set. After the creation is complete, the storage pool Pool only

The initial capacity is allocated, and the remaining space is still placed in the storage pool. When the thin LUN has been allocated

When the storage space usage reaches the threshold, the storage system will allocate a certain quota from the pool to the thin LUN. in this way

Repeat until the full capacity of the Thin LUN is initially set. Therefore, it has a high storage space utilization rate.

Analysis: FCoE is for 10G Ethernet. Enhanced Ethernet can support multiple transmission types, including FCoE and TCP/IP

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.

HyperMetro allows the local and remote sites to run services at the same time, and a quorum server must be configured. Additionally, automatic switchover upon storage faults is supported. HyperClone can be configured for storage devices of different models and versions.

IP SANs are not suitable for deployments that do not require high access speeds, as they are optimized for fast storage access. In this scenario, a more suitable storage solution would be a Network Attached Storage (NAS) system [1], which is designed for slower access speeds.

1. Hard Disk Drive (HDD) vs. Solid State Drive (SSD): What's the ...

https://www.ibm.com/cloud/blog/hard-disk-drive-vs-solid-state-drive

What is computer storage and how is it used?

https://www.techtarget.com/searchstorage/definition/storage

Hard disk drive - Wikipedia

https://en.wikipedia.org/wiki/Hard_disk_drive

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".

Resolution: NFS is a network file system. With the continuous development of the network, this protocol version has gradually increased. There is already

The latest version of 4.1.

NAS (Network Attached Storage) is a type of storage system that provides file sharing services over a network. NAS systems use standard network protocols such as NFS (Network File System) and CIFS (Common Internet File System) to provide file-level access to data, allowing multiple users to access and share files stored on the NAS device. This makes it an effective solution for storing, sharing, and managing large amounts of data within an organization. Additionally, modern NAS systems can offer features such as data replication, snapshots, and data protection, which adds to the functionality of the storage solution.

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.

RAID 0 is a data striping technique that involves distributing data across two or more disks, which allows for increased performance and capacity. RAID 0 does not provide redundancy, and if any of the disks in the RAID group fail, the data will be lost. RAID 5 and RAID 6 are both data striping techniques, but they also provide redundancy, which means that the data is still recoverable even if one or more disks in the RAID group fail. RAID 1 is a data mirroring technique, which involves writing the same data to two disks, and does not use data striping.

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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.

In active-standby mode, only one controller works at a time and if one controller is faulty, services are not affected. In active-active mode, both controllers are active and the service failover is more efficient than in active-standby mode.

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.

When choosing between different types of SSDs, the main factor to consider is the trade-off between cost and reliability. SLC (Single-Level Cell) SSDs are the most reliable and have the longest lifespan, but they are also the most expensive. TLC (Triple-Level Cell) SSDs are less reliable than SLC SSDs, but they are also less expensive. MLC (Multi-Level Cell) SSDs are a good balance between cost and reliability, they are more affordable than SLC SSDs and more reliable than TLC SSDs.

SmartKit is an O&M tool that integrates cloud computing, server, and storage. It cannot be used to monitor third-party devices, as it is only designed to monitor and manage devices in the SmartKit ecosystem.

Zoning is a technology that segregates the nodes in the SAN fabric into multiple networks and allows access control of the members. Subnet, VLAN, and Quarantine are all related to network security, but they are not specifically used in a SAN fabric.

Analysis: The SmartCache feature improves the access efficiency of read hotspot data in the storage system by copying the read hotspot data to the SmartCache pool.

Resolution: A LUN can be created as a Thick LUN and Thin LUN. Thick LUN will be allocated from the storage pool in advance

Storage capacity, even if no user data is stored on the Thick LUN. Thin LUNs are not pre-allocated from the storage pool

For storage capacity, only when user data is written to the thin LUN will the actual storage capacity be allocated from the storage pool.

Sequential read: Since thin LUN dynamically allocates storage resources according to the actual needs of users, space allocation exists in time

Discontinuity, so it will affect the continuity of the space mapped on the disk. When thick LUN is created, the system

Automatic resource allocation technology allocates storage resources from storage resources at one time, which maximizes its mapping to

Space continuity on the disk. Sequential reading of mechanical disks is more efficient, so thick LUNs perform better when reading sequentially

For thin LUN.

Resolution: IO subsystem first and then volume.