[Linux-cluster] Upgrades lead to volumes gone?

[isplist at logicore.net]

I've noticed that only my web servers mount keeps dissapearing. There are 
other machines connected/mounted to the same volume but they don't disconnect.

Only the web servers do yet all machines are exactly the same version and 
OS's. Is there some sort of persistence option somewhere that might have been 
turned off during my upgrade?

Mike