IBM SYSTEM STORAGE DS5000 - Manual (Page 23)

Digital Media Storage Solution Installation Guide 23
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Path Status at Target Level
The icon next to the device indicates the multipathing status for the target (not the LUN):
A single path is connected to your device
Multiple paths are connected to your device and are functioning normally
Multiple paths were connected to your device, but one or more have failed but not all
Multiple paths were connected to your device, but all have failed
Path Status at LUN Level
Path connected to selected LUN is functioning normally
Path connected to the selected LUN was working normally but has failed
Path to the selected LUN is set to Alternate for Read and Write functionality
Represents a Logical Unit