How to calculate the processing power (load) on the data storage server?

Question

network hardware

Hello, I will try to explain the essence of my question without textual water.

And so, the goal is to design a cloud server.
The server rack will look like "ala sandwich"

↓SCHEME↓
------------------------------ -------------------------------------------------- -------------------
Web server (connects to: Swith#1)
Computing server → Swith#1→ storage → Swith#2 → Disk shelf #1; disks #2;Shelf with disks #3; etc.
----------------------------------------------- -------------------------------------------------- -------- The

question is how to calculate the computing power of the storage system and know how much one can withstand Shelves with disks.
I state my question in a simple human language, so that there would be no confusion, I also ask you to state the answer in a simple human language.

Answer 1

The load load is different, you can give large files (> 1GB) on gigabit from 1-2 disks, or you can give several hundred small ones (up to 10 MB), only this will require more than 2-3 disks.
Google what is IOPS, what is read/write linear speed, what is random read/write and how it affects disk load.
Google about the options for teaming (RAID, ZFS, LVM, etc.) and how they affect performance.
Google the difference between SATA/SAS 7.2k/10k/10.5k/15k drives.
Google why an SSD can be faster than an array of multiple 15k SAS.
And after that, take metrics from the application and count how much and what you need.
There is no universal storage system (more precisely, it happens, but it costs like a couple of Boeings)

Answer 2

The issues of designing storage systems are discussed in a professional language, in the presence of a prescribed technical specification.

Answer 3

Just such questions are more appropriate to state not in Church Slavonic, but in professional, moreover, indicating the maximum number of details. Otherwise, "without a normal TK - the result of HZ."

Answer 4

If the ssd is doher and it will rest against the team between the switches and the ssd, so you don’t have to fool around too much