The CA sdf systems stopped.  After a quick investigation it was found that the server running the SDF systems had locked up.  H1build had suffered a kernel panic and needed to be restarted.

I manually started the following SDF models:

h1sysecatc1plc1sdf 
h1sysecatc1plc2sdf 
h1sysecatc1plc3sdf 
h1sysecatx1plc1sdf 
h1sysecatx1plc2sdf 
h1sysecatx1plc3sdf 
h1sysecaty1plc1sdf 
h1sysecaty1plc2sdf 
h1sysecaty1plc3sdf
h1pslopcsdf 
h1hpipumpctrlsdf