Question 71
Which of the following RAID levels has the lowest hard disk space utilization?
Question 72
Which of the following description about CIFS and NFS sharing is incorrect? (Multiple choice)
* If the file system has been set as a CIFS share and then an NFS share is added, the NFS share can only be set as read-only.
* If the file system has been set as an NFS share and then a CIFS share is added, the CIFS share can only be set as read-only.
* CIFS is a network-based sharing protocol, which requires high reliability of network transmission, so it usually uses TCP/IP. NFS is used for independent transmission, so it uses TCP or UDP.
* One disadvantage of NFS is that the client must be equipped with dedicated software. CIFS is integrated into the operating system and no additional software is required.
* NES is a stateless protocol. And CifS is a stateful protocol. After NFS connection fails, the connection can be automatically restored, but CIFS cannot. CIFS only sends a little redundant information, so it has a higher transmission efficiency than NFS.
* If the file system has been set as a CIFS share and then an NFS share is added, the NFS share can only be set as read-only.
* If the file system has been set as an NFS share and then a CIFS share is added, the CIFS share can only be set as read-only.
* CIFS is a network-based sharing protocol, which requires high reliability of network transmission, so it usually uses TCP/IP. NFS is used for independent transmission, so it uses TCP or UDP.
* One disadvantage of NFS is that the client must be equipped with dedicated software. CIFS is integrated into the operating system and no additional software is required.
* NES is a stateless protocol. And CifS is a stateful protocol. After NFS connection fails, the connection can be automatically restored, but CIFS cannot. CIFS only sends a little redundant information, so it has a higher transmission efficiency than NFS.
Question 73
Regarding the steps of SAN synchronous replication, which of the following is in the correct order?
(1) The production storage receives the host write request. Hyper Replication logs the request. Only the address information is recorded in the log, and the data content is not recorded.
(2) Hyper Replication waits for the write processing results of the primary LUN and the secondary LUN to return. If all writes are successful, clear the log; otherwise, keep the log and enter the abnormal disconnection state, and then re-copy the data block corresponding to the log address when synchronization is started.
(3) Write the request to the primary LUN and secondary LUN. Normally, the LUN is in the write-back state, and data is written to the Cache.
(4) Return the processing result of the host write request, subject to the processing result of the write master LUN.
(1) The production storage receives the host write request. Hyper Replication logs the request. Only the address information is recorded in the log, and the data content is not recorded.
(2) Hyper Replication waits for the write processing results of the primary LUN and the secondary LUN to return. If all writes are successful, clear the log; otherwise, keep the log and enter the abnormal disconnection state, and then re-copy the data block corresponding to the log address when synchronization is started.
(3) Write the request to the primary LUN and secondary LUN. Normally, the LUN is in the write-back state, and data is written to the Cache.
(4) Return the processing result of the host write request, subject to the processing result of the write master LUN.
Question 74
In the storage system, which of the following statements about cables are correct? (Multiple Choice)
Question 75
SAS is a point-to-point, half-duplex, dual-port interface.
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