Start, stop and get information about clusters of I/O servers.


  • action: use one of the following types:
    • “info”: get information about clusters deployed by the user (default);
    • “info_cluster”: get information about all the clusters (reserved to administrators);
    • “deploy”: try to reserve hosts and starts I/O servers;
    • “undeploy”: stop reservation and I/O servers.
  • nhost: number of hosts to be reserved as well as number of I/O servers to be started over them.
  • host_partition: name of user-defined partition to be used to group hosts. It needs to be set in case of “deploy” or “undeploy”.
  • user_filter : filter on username in case action “info_cluster” is selected (reserved to administrators).

System parameters

  • objkey_filter: filter on the output of the operator written to file (default=all => no filter, none => no output, cluster_summary => show cluster status, reserved hosts and available resources, cluster_list => show cluster list, cluster_list_summary => show cluster list summary, cluster_user => show cluster user list to administrators, cluster_user_summary => show cluster user list summary to administrators).
  • exec_mode : operator execution mode. Possible values are async (default) for asynchronous mode, sync for synchronous mode with json-compliant output.


Start 3 I/O servers:

[OPH_TERM] >>  oph_cluster action=deploy;nhost=3;host_partition=cluster;


Argument name Type Mandatory Values Default Min/Max-value
host_partition “string” “no”   “all”  
nhost “int” “no”   “0” “0” /
action “string” “no” “info|info_cluster|deploy|undeploy” “info”  
user_filter “string” “no”   “all”  
exec_mode “string” “no” “async|sync” “async”  
objkey_filter “string” “no” “all|none|cluster_summary|cluster_list|cluster_list_summary|cluster_user|cluster_user_summary” “all”