What versions of the NFS protocol are there? (Multiple choice)

Statement 1: Multimode optic cables are usually longer than single mode cables.
Statement 2: Sharp cable bends lead to weaker signal at the end of the cable.

Which of the following system model is a direct representation of the SCSI connection between the SCSI Initiator and Target?

Regarding the steps of SAN synchronous replication, what is the correct order?
(1) The production storage receives the host write request. HyperReplication logs the request. Only the place is recorded in the log Address information, without recording data content.
(2) HyperReplication waits for both the primary LUN and secondary LUN write processing results to be returned. If both are written successfully, clear Log; otherwise keep the log, enter the abnormal disconnection state, and then copy the corresponding number of the log address again when starting synchronization According to the block.
(3) Write the request to the master LUN and slave LUN. Normally, the LUN is in the write-back state, and the data will be written Cache.
(4) Return the processing result of the host write request, which is subject to the processing result of the write master LUN.

The OceanStor 6800 V3 frame itself can be configured with four controllers or only two controllers. If configured as dual control The power supply and BBU are fully configured, and the interface cards and controllers are all arranged in the upper row.