HP StorageWorks XP External Storage user guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (T1706-96017, June 2010)

If both nodes use the same external array
In the configuration in Figure 65, all of the NAS Blade system's user LUs are volumes in the external
array. Only one external array is connected to the local array. Also, only one path is set between
the local array and external array. In this case, if an error occurs in the only set path, none of the
volumes in the external array can be used.
NOTE:
In the configuration in Figure 65, HP recommends setting alternate paths to prevent the NAS Blade
system from being blocked because of the path failure. For more information, see Alternate paths.
The situation in Figure 65 is as follows:
• None of the user LUs can be used from node 1 or node 2.
• Clients cannot access volumes.
• The local array recognizes that the status of all file systems and volumes are blocked.
Figure 65 If both nodes use the same external array
.
1. Restore (for example, check the cable's connection status or change the switch) the status of the
error path between the local array and external array 1.
2. Execute the Check Paths & Restore Vol. command using XP External Storage. For instructions, see
Checking the connection status and resuming external LU operations (Check Paths & Restore
Vol.).
XP External Storage Software User Guide 141