Because the Sybase home directory ($SYBASE) must exist on the CFS mount directory, if the CFS mount directory is not available, instances cannot start.
To verify that $SYBASE directory is available, validate that the ASE group is dependent on the cfsmount group using hagrp -dep:
hagrp -dep
If it is not currently dependent, use hagrp -link to reestablish the dependency:
hagrp -link asegrp1 cfsmount1 online local firm