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520 unknown i/o module detected, 521 ultra 3 i/o module detected – HP StorageWorks 500 G2 Modular Smart Array User Manual

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Troubleshooting

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520 Unknown I/O Module Detected

Type: Error

Description: The controller has detected an I/O module that is not responding
with a known, good identifier.

Action: Replace the I/O module.

521 ULTRA 3 I/O Module Detected

Type: Error

Description: The controller has detected an Ultra3 I/O module.

Action: Replace the I/O module.