Paths are merely a route **TO** the filer, but rather something **ON** the filer. 
 
Therefore, that's an environmental issue external to the filer (rather than something actually on the filer).  So you would need to investigate this with your switch vendor, etc.
 
Do you perhaps have some indication that something on the filer failed and caused this?
 

Stetson M. Webster
Onsite Professional Services Engineer
PS - North Amer. - East

NetApp
919.250.0052 Mobile
Stetson.Webster@netapp.com
www.netapp.com
 

From: Jon Hill [mailto:JHill@jennison.com]
Sent: Tuesday, April 08, 2008 8:06 AM
To: toasters@mathworks.com
Subject: MPIO and path failure

We had an incident the other day where we lost one of our two paths to storage.  We noticed the path failure quite by accident, and some time after it actually happened. 

Does anyone know whether there's a way that the NTAP fibre DSM can be configured to generate an alert (by SNMP or e-mail) whenever a path fails?