Single choice Which one of the following statements about preparing the N8500 before configuration is incorrect?

The following description of the cache in Huawei 0 Ceanstor 9000
Which one is wrong?

Huawei Distributed Storage Object Service provides finely controlled Qos capabilities, providing tenants, buckets Other TPS and bandwidth granular service quality control can precisely control which operations ()

During the processing of Huawei's distributed block service IO stack, the block service of the EDS node writes the data for the write request.
Into the cache, the read request is first hit in the index, if it is not hit, it is read from the cache

Send a control command through the backup server, first take a snapshot (or other similar operations) of the data volume that needs to be backed up, Make a copy, then use the backup server to mount the snapshot volume, and use the backup server to back up the data on this volume to the backup On the device. What type of backup networking is described in the above workflow?