IBM SAS RAID Series, Manual

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Table 8. (continued)
Status Description
Missing The SAS node is no longer detected by controller
Not valid The SAS node is incorrectly connected
Unknown Unknown or unexpected status
Example: Using SAS fabric path information
This data becomes helpful in determining the cause of configuration or SAS fabric problems.
The following example assumes a cascaded disk enclosure with a broken connection on one path between
the cascaded enclosures.
The state of all paths to all devices displays information similar to the following.
Figure 26. Cascaded disk enclosure
Chapter 6. SAS RAID controller maintenance
49