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System Scalability Calculator 시스템 확장성 계산기

// estimate infrastructure requirements at any scale

Presets:

Inputs

Traffic

Daily Active Users DAU

Peak Hours Factor multiplier

x

Requests / User / Day avg

Read / Write Ratio reads per 1 write

:1

Payload

Avg Request Size inbound

KB

Avg Response Size outbound

KB

Storage

Data Retention months

mo

Growth Rate / Month

%

Server Assumptions

RPS per App Server capacity

rps

Cache Hot Data % of working set

%

Scale Tier CALCULATING

Startup

Hyper-scale —

Request Throughput

—

Avg RPS

requests / second

—

Peak RPS

at peak hours

—

Read RPS

from R/W ratio

—

Write RPS

from R/W ratio

RPS — Step-by-Step

Average RPS Total requests / day — DAU \times — req/user — Seconds in a day 86,400 seconds 86,400 s Avg RPS = total_req / 86400 —

Peak RPS Assume peak = 20% of day carries — \times of total traffic — Peak RPS = Avg RPS \times peak_factor — \times — — Read RPS (R:W = —) — Write RPS —

Bandwidth MB/s

—

Inbound avg

MB/s

—

Inbound peak

MB/s

—

Outbound avg

MB/s

—

Outbound peak

MB/s

Inbound Bandwidth Avg = Avg RPS \times req_size — rps \times — KB — Peak = Peak RPS \times req_size —

Outbound Bandwidth Avg = Avg RPS \times resp_size — rps \times — KB — Peak = Peak RPS \times resp_size —

Storage Growth

Now

—

base storage

1 Year

—

—

3 Years

—

—

5 Years

—

—

Storage Calculation Daily data written Write RPS \times resp_size \times 86400 — Base storage (now) daily_data \times retention_months \times 30 — Monthly compound growth S(t) = S₀ \times (1 + r/100)^t —

Cache Memory Working set (hot data) base_storage \times hot_pct% — Recommended Redis RAM hot_data \times 1.2 overhead —

Infrastructure Estimate

☁

App Servers

Min servers (avg) —

Servers (peak) —

With 2x headroom —

Capacity each —

💾

Database Server

RAM recommended —

Disk type —

Storage needed (now) —

Read replicas —

🌐

CDN

Avg egress —

Peak egress —

Monthly transfer —

⚡

Redis / Cache

Memory needed —

Recommended tier —

Cache hit target 80–95%

Eviction policy allkeys-lru

Architecture Diagram live