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SSA Link Errors
SSA link errors can be caused by a number reasons, for example if:
Power is removed from an SSA device
An SSA device is failing
An SSA device is removed
A cable is disconnected.
Errors might be indicated in various ways, such as:
SRN 45PAA
A flashing link status (Ready) light on the SSA device at each end of the failing link
The indication of an open link when using the Disk Service Aid.
SSA Link Error Problem Determination
Instead of using the normal MAPs to solve a link error problem, you can refer directly to
the link status lights to isolate the failing FRU. The descriptions given here show you
how to do this.
In an SSA loop, devices are connected through two or more SSA links to an SSA RAID
Adapter. Each SSA link is the connection between two SSA nodes (devices or
adapters); for example:
Disk drive to disk drive
Adapter to disk drive module
Adapter to adapter
An SSA link can contain several parts. When doing problem determination, think of the
link and all its parts as one complete item.
Here are some examples of SSA links. Each link contains more than one part.
Example 1
This link is between two disk drives that are in the same subsystem. It has three parts.
Internal
Connection
Disk
Drive 1
Disk
Drive 2
SSA Subsystem
Copyright IBM Corp. 1998 15