What is the read/write speed of the Synology Enterprise Drives included, and how does it affect overall performance?

The read performance is up to 2,315 MB/s and the write performance is up to 1,147 MB/s.

What are the dimensions of the Synology RS1221+ RackStation, and will it fit into a standard server rack?

The dimensions of the Synology RS1221+ RackStation are 3.46" x 18.98" x 12.07" (with server handles).

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Synology RS1221+ RackStation with 4GB RAM and 128TB (8 x 16TB) of Synology Enterprise Drives Fully Assembled and Tested By CustomTechSales