Mirrored Memory Module

Mirrored Memory  Module  Note:  For  full instructions  on installing the M3,  see its  Installation Guide  (ESI  #0450-0912). The  Mirrored Memory  Module  (M3)  ensures reliability  and survivability  of  compatible  ESI  Communications  Servers. Using RAID1-1  hard-disk  drive technology,  mirrored hard  drives  are intended  to  maintain  system  operation on one disk drive in the event a hard drive fails. No system programming is required for the M3 to function. Note:  The ESI-1000 has  all M3  components  built-in,  so  the installation on the  ESI-1000 of  the hard-drive  Memory Modules  (see “Procedure for  two hard-drive Memory  Modules  (ESI-1000),”  page  F.5)  enables  M3 operation on that  system.  M3 components  are optional for  the  ESI-600 and ESI-200,  and must  be installed onto the ESI  Communications  Server  main board. The M3  is  a printed  circuit  assembly  that  supports  two  identically  configured  hard  drives,  mounted on  standoffs. It  also  has  LED indicators,  an  audible  alarm,  alarm  reset  button,  and an  IDE cable  connector  for  connection to the main  board. For  the mirroring  operation to  function  properly  on  the ESI  Communications  Server,  each hard  drive  must  be formatted and prepared by  ESI. Installing  the M3  (ESI-600 •  ESI-200) The M3  kit  consists  of  an  M3  printed circuit  board,  hard  drive  mounting  plate,  faceplate,  four  (4)  1-inch standoffs,  12  nylon  spacers (washers),  eight  (8)  screws,  and an  IDE  cable for  connection to  the main  board. Refer  to  Fig.  M3-1,  below, to  identify  and  locate  where  these  components  will be  installed. Memory  Modules  (hard drives,  or  HDDs)  are  obtained  separately.  Note  that  each hard  drive  must  be an ESI-formatted  drive for  the  mirroring  operation to  function  properly.