The array transfer speed is very slow.

Applicable Models

D5-300, F4-300, D5-310, D5-300C, D2-320, D5 Hybrid, D8 Hybrid

Please check if the disks you are reading/writing are in RAID 1/RAID 5/RAID 10. If they are currently synchronizing, the synchronization process will consume most of the bandwidth, causing slower read/write speeds.