IBM System i 525 (9406-525)
You have a System i 525. Here is what that means now: a POWER5+ entry model whose activated capacity, IBM i level, software tier, I/O, and recovery evidence need to travel with every quote.
The 9406-525 is a System i POWER5+ entry model. Do not turn 525 into a rough synonym for 520 or 550. The full code and processor feature protect the parts order, software tier check, and target sizing from a wrong assumption.
Four checks before a support or replacement quote
1. Identity
Record 9406-525, the serial number, processor feature, and activated processors.
2. Work
Capture busy-hour CPU, CPW evidence, memory used, disk growth, and the batch window.
3. Connections
List storage, tape, network, printers, special adapters, and outside systems that exchange data.
4. Recovery
Prove the restore, application startup, security, interfaces, and user access before the old system becomes the emergency plan.
A current Power11 can be far smaller than the old frame and still do more work. The quote still needs measured workload, software tier, memory, I/O, storage, and recovery evidence.
Related
IBM System i 515 (9407-515)
You have a System i 515. Here is what that means now: a small POWER5+ IBM i system whose processor feature, software tier, storage, and recovery plan need to be documented before support or migration quotes.
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You have an i5 520 9406-520. Here's what that means in 2026: IBM's entry-level Power5 workhorse, outside IBM's standard support since staged 2019-2020 withdrawals.
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You have an i5 550 9406-550. Here's what that means in 2026: IBM's step-up Power5 server, outside IBM's standard support since staged 2019-2020 withdrawals.
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You have an i5 570 9406-570. Here's what that means in 2026: one of the most widely deployed Power5 midrange models, outside IBM's standard support since staged 2019-2020 withdrawals.