The following steps are needed to build and configure HPSS enabled servers.

A. Building a HPSS enabled server

1) Edit the config/config.mk file:
    . uncomment the line HPSS=1, e.g.,
        HPSS=1
    . define the HPSS_LIB_DIR (the hpss libraries directory) and 
      HPSS_HDR_DIR (the hpss header directory). e.g.,
        HPSS_LIB_DIR=/opt/hpss/lib
        HPSS_HDR_DIR=/opt/hpss/include
    . If the the UNix password authentication is to be used instead of the
      default of using the keytab file, uncomment the line the 
	 HPSS_UNIX_PASSWD_AUTH=1
2) cd to the irods home directory and type in "make" to re-make the server.

B. Configurating a HPSS enabled server

1) cd to the server/config directory and use the template files 
   hpssAuth.template and hpssCosConfig.template for the hpssAuth and
   hpssCosConfig files. e.g., 
      cp hpssAuth.template hpssAuth
      cp hpssCosConfig.template hpssCosConfig

   and edit the hpssAuth and hpssCosConfig files according to the instructions
   given in these files. The hpssAuth file configures the HPSS authentication
   for the driver and the hpssCosConfig configures the COS (class of services)
   for the driver.

2) create a HPSS resource - The HPSS driver is implemented as a compound
   class resource because of the parallel transfer mode of HPSS. As explained
   in this link: https://www.irods.org/index.php/resource, the compound
   resource implementation requires a cache class resource to be configured 
   in the same resource group as the compound resource. Data stored in 
   the compound resource cannot be accessed directly but through the cache 
   resource. The following gives an example of creating a HPSS resource 
   using iadmin:
      iadmin mkresc hpssResc hpss compound nacho.sdsc.edu /home/irods/Vault 
   
3) Add the HPSS and cache resources to a resource group. e.g.,
      iadmain atrg myrescGroup hpssResc
      iadmain atrg myrescGroup cacheResc

   Note: the cacheResc resource must be on a HPSS enabled server and does
   not have to be on the same host as the hpssResc. This way, multiple
   cache resources on different hosts can be used as the front-end for
   the HPSS resource.