As mentioned before, dual hard disks for a 3 U device must form RAID1 to improve data security and accessibility. The two hard disks of RAID1 are completely mirrored. Usually, the RAID1 creation process takes about 4 to 5 hours or longer.
This process is also the hard disk read and write process. The read and write speed of a hard disk is related to multiple factors, such as the hard disk speed, controller speed, and CPU speed. Firewalls use high-speed SAS disks and LSI controllers (the value of the DiskIOC_Vendor field in the display disk information command output).
The building of a 300 GB hard disk requires more than 4 hours if the read and write speed is 20 MB/s.
