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At which stage in the Unity power up sequence would the Storage Processor enter Service mode upon detecting an error?

At which stage in the Unity power up sequence would the Storage Processor enter Service mode upon detecting an error?
A . After the CMI is started
B . Bootflash
C . POST
D . BIOS

Answer: C

Explanation:

Note: Boot counters are a troubleshooting mechanism that is designed into the Unity architecture to help pinpoint the specific cause of software or hardware events during the boot sequence. If the Unity system detects a problem with software or hardware components, its corresponding Boot Counter is incremented. If a counter reaches a predefined threshold, the SP boots into Service Mode during its next boot cycle.

References: https://www.emc.com/collateral/TechnicalDocument/docu69328.pdf (page 12)

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