Storage Technology Concepts

• In RAID 2.0+, one-to-many rapid refactoring mode is not supported.
• For disaster recovery with high data volume and business continuity needs, along with external service during disasters, setting up two data centers with active-active operation in the same city and another data center in a different location for asynchronous remote replication is the recommended network.
• With SmartMatrix architecture, a single system cannot expand to unlimited controllers.
• A Router is not a basic component of SAN architecture.
• Traditional RAID has a slower reconstruction speed compared toRAID 2.0
• A backup network is not a factor to consider when planning storage backup capacity.
• A Host Group cannot be controlled by SmartQoS.
• A characteristic of a wrong data compression is that some data information may be lost.
• In RAID 2.0+, a Grain is the minimum allocation granularity of storage space in Thin LUN mode.
• Serial transmission is slow and low cost, ideal for long-distance transmission.
• In a storage system expanded by Scale-Out, no forwarding between controllers is needed for full interconnection of controllers in the SmartMatrix architecture.
• S3 and Swift Protocols are not features of Huawei's hybrid flash storage.
• Traditional RAID has a slower reconstruction speed compared to RAID 2.0.
• RAID1 has the lowest hard disk utilization when using 10 2TB hard disks.
• FusionCube Builder is a system installation tool suitable for rapid on-site installation and deployment of the FusionCube system.
• HyperMirror can enable a LUN to generate two physical copies simultaneously.
• OceanStor BCManager simplifies disaster recovery scheduling and operation for Huawei's dedicated backup storage.
• GSLB (site load balancing) is used in active-active disaster recovery to allocate traffic between servers across different regions.
• iSCSI is a commonly used protocol in SAN networking.
• Cascading snapshots refer to a a snapshot of a snapshot which contains the data written by the shapshot.
• SDRS is not a type of service provided by Huawei OceanStor 100D series storage.
• File System is the object of protection of the HyperLock feature.
• In a primary-backup disaster recovery system, the slave LUN capacity should match the master LUN.
• To repair a file system error in RachatLinux7, use the root user to perform fsck repair on the device while the file system is mounted
• DeviceManager cannot collect Storage Content information about storage devices.
• DeviceManager is the graphical management interface included with Huawei's all-flash storage system.
• Upgrading the source storage version to V300R006 is not part of the homogeneous migration solution process.
• LUN data is evenly distributed to the cache of all nodes and processed by all controllers is not a feature of Huawei's all-flash storage system software which adopts the Symmetric Active-Active architecture
• A sector is the smallest storage unit in a hard disk, typically 512 Bytes.
• DRAM is not a non-volatile storage medium.
• Current PCIe versions: 1.0, 2.0, 3.0, and 4.0
• Advantages of deduplication and compression technology: Reduced procurement costs, extended SSD lifespan, and reduced storage space
• Correct descriptions about 2U SAS disk enclosure Scale-Up:
  • The number of cascaded disk enclosures cannot exceed the maximum cascade depth of the system
  • A-level cascade board is connected in a positive direction, B-level cascade board is connected in reverse direction
  • A-level cascade board connects to A controller, B-level cascade board connects to B controller -The downstream port (EXP) of the upper disk enclosure in the same loop is connected to the upstream port (PRI) of the lower disk enclosure.
• For Huawei's all-flash storage products, the following indicator light descriptions are correct:
  • Amber alarm indicator on the controller box indicates a warning.
  • Blue indicator light on the controller subrack indicates the subrack is being positioned.
• Correct descriptions about RAID10: -The number of hard disks is always an even number.
  • RAID10 combines mirroring and striping, performing RAID 1 mirroring first and then RAID 0.
  • Data writing is faster in parallel between sub-groups, and within a sub-group, it's written in mirroring.
• The IB network hierarchy includes the Transport, Network, Application, Physical, and Link Layers
• Correct points about SmartVirtualization of Huawei storage systems:
  • Local storage system does not occupy space when using LUNs in a heterogeneous storage system.
  • Value-added functions like remote replication and snapshots can be set up for external LUNs.
• The fully interconnected architecture of Huawei storage includes:
  • Full front-end interconnection
  • Full back-end interconnection
  • Controllers are fully interconnected
• When the engineer enters commands to perform routine maintenance on storage devices, the correct decscriptions are: -The operation performed is change -The modified user level is admin
• Huawei storage (e.g., OceanStor hybrid flash) with SAS interface hard disks can also support NL SAS and SSD hard disks
• When tuning Huawei hybrid flash storage for a decision support system with large single IO size, mostly sequential reads, high front-end bandwidth utilization and backed by a host application database, the following are incorrect:
  • Use the OLAP model as a reference for tuning
  • Increase front-end service bandwidth
• The business needs to provide block services and file services. Which of the following is correct?
  • CIFS and NFS are both C/S
  • Support AD domain environment
  • Support for non-domain environments
  • Support CIFS/NFS deployment on the same network
• NFS protocol descriptions that are wrong:
  • It also known as SMB (server message block), there are currently multiple versions released, such as SMB1.0, SMB2.0, SMB3.0, so the version needs to match when using it
• Supported authentication methods include NILMKberos
• In a new storage system with high I/O characteristics, the hard disk domain comprises:
  • NL-SAS -SAS
• Huawei SAS disk enclosures support:
  • Forward connection
  • Reverse connection networking
  • Dual-plane networking
  • Symmetrical networking
• Correct statement about Namenode concurrency characteristics of Huawei's distributed storage products:
  • Avoid metadata service interruption caused by HDFS Name node switching
  • Multi-directory metadata operations on multiple nodes concurrently
• Common types of SCM media:
  • PCRAM
  • ReRAM
  • MRAM
• Correct descriptions about LUNs and LUN groups for Huawei OceanStor all-flash storage devices:
  • You can use DeviceManager to create multiple LUNs at one time.
  • When creating a LUN using DeviceManager, you can select the application type corresponding to the LUN.
  • A LUN group can contain only one LUN

Explore key concepts in storage technology, including RAID levels, disaster recovery strategies, SAN architecture, and data compression. This resource covers RAID 2.0 features, SmartMatrix limitations, SmartQoS restrictions and backup considerations.