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WorksheetsLMS-Infosyte Test-10
Total questions: 60
Worksheet time: 30mins
Which description of snapshots in storage (e.g., Huawei OceanStor hybrid flash storage) is incorrect?
Snapshots can be generated instantly, quickly obtaining a consistent copy of the original LUN
After mapping snapshot LUNs to the host, data can be read and written
When snapshots are inactive, the write I/O flow is the same as without snapshots
When creating a snapshot, overwrite writing does not need to reallocate space
In a system supporting iSCSI, what type of packet is formed when iSCSI nodes encapsulate instructions and data for network transmission?
SCSI packet
Ethernet data frame
IP packet
iSCSI packet
Which is not a component of the SSD control unit?
Host interface
NAND flash particles
SSD controller
DRAM
For performance monitoring of small I/O applications, which indicator is mainly focused on?
Time
Capacity
Bandwidth
IOPS
Which description of the reliability of Huawei OceanStor Dorado all-flash storage series is incorrect?
RAID2.0+ underlying virtualization
All SSD disks, high IOPS, low latency
Advanced data protection technologies like HyperSnap, HyperReplication
Component failure protection, dual redundancy design, and A/A working mode
After the read/write head moves to the track where the data is located, the time needed for the required data block to rotate under the head defines which parameter?
Average seek time
Average traversal time
Average wait time
Average rotational latency
Current PCIe versions:
PCIe 1.0
PCIe 2.0
PCIe 3.0
PCIe 4.0
Advantages of deduplication compression technology:
Reduces procurement costs
Extends SSD life
Ensures performance priority for critical services
Reduces storage space
Correct descriptions of 2U SAS disk enclosure Scale-Up:
The number of cascaded enclosures must not exceed the system’s maximum cascade depth
A cascading board connects to the A controller, and B cascading board connects to the B controller
The A cascading board connects to the A controller, and the B cascading board connects to the B controller
The downward port (EXP) of the previous enclosure in the loop connects to the upward port (PRI) of the next enclosure
Correct descriptions of indicators in Huawei all-flash storage products:
Amber alarm indicator in the control enclosure means a warning
Blue locating indicator light in the control enclosure means it is being located
The power button and power indicator may not be separate
Correct descriptions of RAID 10 operation:
RAID 10 can recover data when two disks fail
RAID 10 always has an even number of disks
RAID 10 writes data in parallel within subgroups and uses mirroring within subgroups
RAID 10 combines mirroring and striping, first performing RAID 1 mirroring and then RAID 0 striping
Layers in IB network:
Transport layer
Network layer
Application layer
Physical layer
Link layer
Key technologies of FlashLink in Huawei all-flash storage systems:
Intelligent flow control technology
Cold and hot data segregation
Intelligent regulation
Large-scale write leveling
Global data flow and load balancing
Correct statements about storage:
Storage refers to hard drives
Storage system includes hardware, software, and solutions
Storage types include block storage, file storage, and object storage
File storage is generally used to store database application data
Correct descriptions of ATA and SCSI system hard drives:
SCSI system hard drives are more reliable than ATA system hard drives
ATA system hard drives experience delays due to frequent head switching during multi-task data reads
SCSI, SAS, and FC drives use the SCSI system and support high concurrent needs in servers
ATA system drives perform poorly with large data volumes and are slower than SCSI system drives
Features that support non-disruptive data protection for instant transaction data:
HyperCDP
HyperSnap
HyperMetro
HyperReplication
Incorrect descriptions about NAS:
NAS devices can use clustering for failover
NAS provides a centralized console for effective file system management
NAS cannot be accessed by multiple clients simultaneously
A client can connect to multiple NAS devices at different times
Correct descriptions of SmartVirtualization:
SmartVirtualization connects to heterogeneous storage arrays through multipath software with redundant paths
LUNs in the local storage system do not occupy local storage space
Data migration with SmartVirtualization is more efficient than data-directed writing
The local storage system can provide value-added services such as copy services and snapshots for heterogeneous LUNs
Components of Huawei’s full interconnect architecture:
Network full interconnect
Front-end full interconnect
Back-end full interconnect
Controller full interconnect
Optimization adjustments for frequent data access hotspots in a transaction system with SmartTier enabled:
Prioritize high-performance layer allocation
Move data to the high-performance layer
Prioritize capacity layer allocation
Move data to the low-performance layer
Main applications of volume mirroring (HyperMirror):
Mirroring between two LUNs in the same array
Mirroring between heterogeneous arrays using virtualization
Mirroring between two heterogeneous LUNs using virtualization
Mirroring LUNs on different controllers
Incorrect descriptions about RAID 2.0+:
Disks are divided into chunks
LUNs are composed of extents or grains
Chunks in a CKG (Chunk Group) may come from the same disk
Chunks in a CKG may come from different storage pools
Technologies ensuring high reliability in all-flash storage products:
Power-off protection
Safebox disks
Dual redundancy design and A/A working mode
Advanced data protection technologies like HyperSnap and HyperReplication
Common time indicators for measuring system reliability:
Reliability
Availability
Mean Time to Failure (MTTF)
Mean Time Between Failures (MTBF)
Advantages of DAS:
Simple deployment
High initial investment
Low network complexity
Simple configuration
Service groups achievable in OceanStor Dorado all-flash storage systems:
Front-end interface service group
Global cache service group
Back-end interface service group
Storage pool service group
Correct descriptions of Scale-Up:
Scale-Up requires expanding more controllers
Scale-Up can be achieved by adding storage
Scale-Up is a horizontal expansion architecture
Scale-Up is a vertical expansion architecture
M values in data splitting for distributed storage systems using EC encoding:
2
1
3
4
Optimizations for NAS devices based on common servers:
Search functionality
Deep learning functionality
File service functionality
Storage functionality
Correct descriptions of the CLI command "change user user-name newuser level admin":
The operation performed is "change"
The modified user level is "admin"
The attribute of the operation object is "user"
The operation object is "user_name"
Supported disk types in Huawei storage with SAS interface:
NL SAS disks
SCSI disks
FC disks
SSD disks
Performance optimization measures unsuitable for a decision support system:
Use OLAP model for tuning
Use OLTP model for tuning
Use SmartCache feature
Increase front-end business bandwidth
Correct descriptions for providing block and file services:
CIFS and NFS are both C/S
Supports AD domain environment
Supports non-domain environment
Supports CIFS/NFS deployment in the same network
Incorrect descriptions about NFS protocol:
Also known as SMB (Server Message Block), with multiple versions such as SMB1.0, SMB2.0, SMB3.0
CIFS protocol allows users to view and write files stored in the system as if using a local machine
CIFS adopts B/S architecture mode; administrators need to confirm browser versions during attachments
Supported authentication methods include NLM, Kerberos
Correct descriptions of storage interface layers in Huawei OceanStor distributed storage:
Supports SCSI and iSCSI protocols
Supports S3 and Swift protocols
Supports HDFS protocol
Supports IB protocol
Parameters for load balancing modes in Huawei multipath software:
min-queue-depth
split-size
min-task
round-robin
Correct descriptions of NAS architecture:
UNIX and Windows users can seamlessly share the same data through NAS
NAS eliminates the need to establish multiple file servers
NAS uses network and file sharing protocols for archiving and storage
NAS provides file-level sharing
Hard disks in high-performance and performance layers for main business:
NL-SAS
SAS
SSD
Scale-Up networking modes for Huawei SAS hard disk enclosures:
Forward networking
Reverse networking
Dual-plane networking
Symmetrical networking
Correct descriptions of Huawei distributed storage product Namenode concurrency:
Avoids metadata service interruption caused by HDFS Namenode switching
Multi-directory metadata operations on multiple nodes
Multiple Active Namenodes provide metadata services with data consistency
Number of files supported by multiple Active Namenodes is not limited by single-node memory
Common SCM media types:
PCRAM
ReRAM
MRAM
DRAM
Correct descriptions of LUN and LUN group in Huawei OceanStor all-flash storage devices:
Multiple LUNs can be created at once using DeviceManager
All Huawei OceanStor all-flash storage devices can create thick LUNs
Application type for LUNs can be selected during creation with DeviceManager
A LUN group can contain only one LUN
Correct descriptions of CIFS protocol operation:
CIFS protocol has more interactions than NFS
CIFS protocol requires TCP/IP for file resource sharing
NFS protocol consumes far fewer resources than CIFS
CIFS protocol does not require security authentication
Solutions for high resource usage due to iSCSI Initiator software in IP SAN network:
Upgrade NIC to TOE NIC
Upgrade 10GE network to 25GE network
Upgrade NIC to iSCSI HBA
Correct descriptions of DAS characteristics:
Limited number of ports for connecting to the host
System must be powered down for DAS maintenance
Storage resources in DAS cannot be shared if space is tight
Multiple hosts connected to DAS can provide different service levels
Indicators for measuring mechanical hard disk performance:
Disk capacity
Disk rotation speed
Data transfer rate
Average access time
Correct descriptions of flash memory cells:
TLC stores 4 bits per cell
MLC stores 2 bits per cell
QLC stores 3 bits per cell
SLC stores 1 bit per cell
Functions of multipath software:
Failover for faulty paths
Load balancing of I/O traffic
Recovery of faulty paths
Data recovery
Advantages of Huawei RAID 2.0+ over traditional RAID:
Automatic load balancing
Fast precise reconstruction
Improved single LUN performance
Simplified management
Technologies not meeting performance and cost requirements for archiving and online business data:
SmartCache
SmartTier
SmartClone
SmartMetro
Incorrect descriptions of SmartThin working principles:
Unallocated space is used as needed
Expanding backend storage units for system expansion requires system reboot
User-visible storage space matches actual allocated space
SmartThin hides the actual storage space of Thin LUN from the host, providing nominal space instead
Correct principles of SAS cabling:
Each SAS channel typically operates at 12 Gb/s
SAS devices are connected in a loop
Bandwidth limits the number of disks in the loop
SAS cables generally have 4 channels
Correct descriptions of HyperClone synchronization process:
Does not support reverse incremental synchronization
Initial synchronization overwrites existing data on the target LUN
A snapshot is automatically created during initial synchronization
Initial synchronization is full synchronization
States of files in WORM file system:
Expired state
Initial state
Locked state
Appended state
Correct network planning rules for storage network architecture:
Nodes are typically deployed top down in the cabinet
Number of nodes in a cabinet depends on customer site conditions
Evaluate the total power consumption and weight of nodes, switches, and KVMs in the cabinet
Nodes in the base cabinet are connected to switches within the cabinet using cables
Correct statements about FCoE protocol:
Transmits Fibre Channel signals over enhanced Ethernet
Shorter transmission distance than FC protocol
Requires enhanced lossless Ethernet to meet FC transmission requirements
Encapsulates FC frames in Ethernet frames, allowing LAN and SAN traffic over the same network
Advantages of SmartThin over traditional storage deployment:
Significantly reduces initial investment
Maximizes storage resource utilization
Increases storage space utilization
Promotes uneven storage space utilization
Disks corresponding to performance and high-performance layers in a high I/O system:
SATA
NL-SAS
SAS
SSD
Recovery modes in Huawei BCManager disaster recovery drills:
Fault migration
Business recovery
Fault recovery
Planned migration
Disaster recovery features supported by Huawei storage for non-disruptive business operations:
Active-passive
Active-active
Three Data Center (3DC)
Snapshot
