IBM server rentals (including IBM Power Virtual Server / IBM Cloud infrastructure used for enterprise workloads) charge for bandwidth in a usage-based model, mainly focused on data leaving IBM’s network (egress traffic).

Here’s how it works in real enterprise setups:

🌐 💰 1. What “bandwidth charging” means in IBM rentals

IBM does NOT charge for all network traffic.

They split it into:

🟢 Inbound traffic (data coming in)

• Usually FREE
• Example: uploading data, backups, migrations

🟡 Internal/private network traffic

• Often FREE or unlimited
• Example: traffic between IBM servers inside same private network

🔴 Outbound public internet traffic (Egress)

This is where you pay.

• Data going from IBM servers → Internet
• Data moving to external systems
• Cross-region data transfer (sometimes charged)

👉 This is the main bandwidth cost component

📊 2. How IBM charges for bandwidth

IBM typically uses tiered GB-based pricing:

💵 Common pricing pattern (industry IBM model)

• First few GB/TB: low or included allowance (varies by plan)
• After free tier: charged per GB

Typical ranges:

• $0.05 – $0.12 per GB (classic / VPS workloads)
• Enterprise negotiated pricing may be lower at scale

📦 3. Example bandwidth billing

Example SAP enterprise system:

• 5 TB/month outbound traffic

If rate = $0.08/GB:

• 5 TB = 5120 GB
• 5120 × $0.08 = ~$409/month bandwidth cost

Example high-traffic system:

• 50 TB/month outbound traffic
• 50,000 GB × $0.07 = ~$3,500/month

👉 Bandwidth becomes a major cost driver at scale.

⚙️ 4. Important IBM-specific rules

🔹 A. Private IBM network = usually free

• Communication between IBM systems in same region
• Cluster / SAP internal traffic

🔹 B. Public internet = billed

• Websites, APIs, external users

🔹 C. Cross-region traffic = sometimes charged

• Moving data between IBM regions/datacenters

🔹 D. Inbound = free

• Uploading data to IBM servers

🧠 5. Key insight (very important)

IBM server cost is usually not dominated by bandwidth unless you have:

• High-traffic web apps
• Large data exports
• Media streaming
• Data replication across regions

For SAP and enterprise databases:

• Bandwidth cost is usually small compared to compute + RAM

📌 6. Simple summary

IBM server rentals charge bandwidth like this:

• 🟢 Inbound traffic → FREE
• 🟢 Private network traffic → FREE
• 🔴 Outbound internet traffic → charged per GB
• 🔴 Cross-region transfer → may be charged
• 💰 Typical rate → ~$0.05–$0.12 per GB

💡 Bottom line

IBM bandwidth pricing is usage-based (GB out), not fixed monthly, and only becomes expensive when you move large volumes of data outside IBM systems.