Table of Contents
Advertisement
v The Adapter Port column shows the address of each adapter port to which a
particular device is connected. The device is connected to two ports except when
the SSA loop is broken, under which condition the device is connected to only
one port.
v The Status column shows the existing status of the physical disk drive, as known
by the adapter. Status conditions are:
Good
The disk drive is working correctly.
Failed
The disk drive has failed.
Power The disk drive has detected an enclosure fault.
Format The disk drive is being formatted.
An SSA link must be configured in a loop around which data can travel in either
direction. The loop is broken if a cable fails or is removed, or if a disk drive fails.
Because each disk drive on the loop can be accessed from either direction, the
broken loop does not prevent access to any data, unless that data is on the failed
disk drive. If the loop is broken between two disk drives, the Ready lights on those
disk drives flash to show that only one SSA path is active. Also, the Link Verification
service aid shows that only one path is available to each disk drive on the broken
loop.
You can find the physical location of any disk drive on the loop by using the Identify
function (see "The Identify Function" on page 375).
Chapter 17. SSA Service Aids
385
Advertisement
Table of Contents
