HP Surestore Auto Path Virtual Array for Windows NT Installation and User's Guide

8 HP Auto Path XP: User’s Guide (Windows NT/2000)
Automatic failover and recovery
In the event of a failure of any part of a path between the disk array and a
server, Auto Path automatically switches to an alternate path, dropping the
failed path out of the I/O rotation without any loss of data. The failover is
not visible to applications, so normal operation continues, without
downtime. After the paths are restored, they are automatically detected and
used for I/O.
All path changes are logged in the Windows Event Viewer log. Service
personnel can use the log to investigate and repair failed paths.
For troubleshooting information, see “Troubleshooting” (page 67).