A research unit purchased a Huawei Oceanstor 9000 storage products, the main configuration products: 8 * Oceanstor 9000 C node, the front end 10GE * 2, CE6850 switch * 2, S5700 switch * 1, cables, lighting and other accessories are fully furnished, households communication deployment program, prepared in advance a list of IP planning programs and IP requirements. Which of the following IP address is needed? (Multiple choice.)

• A. The client needs to provide 49 IP addresses that can interoperate with client applications, 16 for the static front end, 32 for the dynamic front end, 1 for InfoWqualizer DNS IP.
• B. The customer management network must be interoperable with the OceanStor 9000 InfoEqualize DNS IP to access the OceanStor 9000 storage.
• C. The customer needs to provide 16 IP addresses for Oceanstor 9000 system back-end IP and need to provide a gateway.
• D. Customers need to provide nine management network IP addresses, of which eight for IPMI management, one for OM management.

In the Huawei OceanStor storage array, the write cache high watermark is 80 and the low watermark is 20, and the service type is multiple-order small IO. To achieve better performance,it is advisable to adjust the water marks in which way?

• A. low water line 30
• B. high water to 90
• C. low water line 10
• D. high water to 70

In the scenario of protecting the database, the slave uses the virtual snapshot method to verify the services of the production end andthe DR-side and discover the data of the DR on the disaster recovery end. What are the possible reasons that the library can not start normally? (Multiple choice.)

• A. After a snapshot of the LUN of the redundancy site is created, the snapshot is not activated at the same time.
• B. When creating a snapshot on the disaster recovery end LUN, the production end is copying data to the disaster recovery end.
• C. Disaster recovery side of the data stored in the cache, not yet written to the hard disk.
• D. The production end and disaster recovery end adopt the disaster recovery solution of incremental LUN copy, and the incremental data link is abnormal during the synchronization.

Production time is Monday to Friday 8:00 to 18:00. There are three LUNs, respectively LUN1, LUN2, LUN3, LUN1 with a size of 500G, all IO.
The average response time needs to be within 5ms, the size of LUN2 is 4TB, the coexistence of hot and cold data (with 12.5% of the hot data), andthe size of LUN3 is 10TB. If performance requirements are not high and the engineer plans to use SmartTier, which of the following description is correct? (Multiple choice)

• A. Set the monitoring period of the Smart tier to 8:00 to 18:00 every day from Monday to Friday. The migration period is not overlappedwith the monitoring period
• B. The use of 3-tier Tier, high-performance layer 1TB, performance layer is 4TB, capacity layer is
  10TB,while configuring LUN1, LUN2, LUN automatic relocation. The LUN3 is migrated preferentially to the low-performance layer
• C. Use 3-tier Tier, 1TB high-performance layer, 4TB performance layer, 10TB capacity layer, configure LUN1 and LUN2 to migrate automatically, and LUN3 priority allocation of low-performance layer capacity
• D. Use 3-tier Tier, 1TB high performance layer, 4TB performance layer, 10TB capacity layer, and configure LUN1 to allocate high-performance layer capacity first, LUN2 preferentially allocates performance layer capacity and LUN3 preferentially allocates capacity layer capacity