The online path statuses are as follows:
Online
I/Os can be issued normally.
Online(E)
An error has occurred on the path, but none of the other paths that access the same LU are in the Online status.
If none of the paths accessing a particular LU are in the Online status, one of the paths is changed to the Online(E) status. This ensures that the LU can be accessed through at least one path.
The (E) means error, which indicates that an error has occurred on the path from some previous operation.