GLX_SHM_REG

   For Alpha Galaxy systems, GLX_SHM_REG is the number of shared
   memory region structures configured into the Galaxy Management
   Database (GMDB). If set to 0, the default number of shared memory
   regions are configured.

   If the condition value SS$_INSF_SHM_REG is returned for the
   $CRNMPSC_GDZRO_64 system service with the flag SEC$M_SHM_REG, the
   Galaxy shared memory code has run out of internal SHM_REG data
   structures. You need to increase the system parameter GLX_SHM_REG
   and reboot all Galaxy instances with this larger parameter value.