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SSA Link Errors
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SSA link errors can be caused if:
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Power is removed from an SSA device
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An SSA device is failing
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An SSA device is removed
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A cable is disconnected.
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Such errors might be indicated by:
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SRN 45PAA
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A flashing link status (or Ready) light on the SSA device at each end of the failing link
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The indication of an open link by the Link Verification Service Aid.
SSA Link Error Problem Determination
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Instead of using the normal MAPs to solve a link error problem, you can refer directly to
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the link status lights to isolate the failing FRU. The descriptions given here show you how
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to do this.
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In an SSA loop, SSA devices are connected through two or more SSA links to an SSA
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adapter. Each SSA link is the connection between two SSA nodes (devices or adapters);
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for example, disk drive module to disk drive module, adapter to disk drive module, or
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adapter to adapter.
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An SSA link can contain several parts. When doing problem determination, think of the
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link and all its parts as one complete item.
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Here are some examples of SSA links. Each link contains more than one part.
Chapter 2. Problem Determination Procedures
2-11
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