IBM 7133 D40, Руководство по обслуживанию

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SSA Link Errors
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.
v
An SSA device is removed.
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A cable is disconnected.
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Bypass card modes have been set incorrectly.
Such errors might be indicated by:
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SRN 45PAA
v
A flashing link status (or Ready) light on the SSA device at each end of the failing
link
v
The indication of an open link by a link verification service aid
Resetting Bypass Card Modes
If the bypass card modes have been set in such a way that the using system can no
longer get access to the 7133, you cannot use the service functions to change those
modes. You can, however, manually reset the modes to their default settings.
Attention: When you reset the modes manually, all bypass cards that are not jumpered
for Forced Inline mode are reset to Automatic mode in this 7133. Your configuration
might be seriously affected.
To reset the modes, hold all three ID push buttons (see “ID push buttons” on page 11)
pressed until the display flashes after approximately 10 seconds. All bypass cards that
are not jumpered for Forced Inline mode are reset to Automatic mode in this 7133.
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, SSA devices are connected through two or more SSA links to an SSA
attachment. Each SSA link is the connection between two SSA nodes (devices or
adapters); for example, disk drive module to disk drive module, SSA attachment to disk
drive module, or SSA attachment to SSA attachment.
An SSA link can contain several parts. When doing problem determination, think of the
link and all its parts as one complete item.
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7133 Models D40 and T40 Service Guide