Restart

1. Subarray Node provides API for Restart workflow.

2. The Sub-array node accepts the command if :-

   1. Admin mode reported by each of the system - CSP,SDP subarray are in ONLINE/ENGINEERING/RESERVED

   2. Operational state of the Sub-array node is ON/OFF/INIT/STANDBY/ALARM

3. The Sub-array Node rejects the command if :-

   1. Admin mode reported by each of the system - CSP,SDP Sub-array are in OFFLINE or NOT FITTED.

   2. Operational state of the sub-array node is FAULT/UNKNOWN/DISABLE .

4. The following state requirements are applied for the command execution :-

   1. TMC Subarray is in ‘observation state’ ABORTED or FAULT .

   2. isSubarrayAvailable is checked to ensure the subsystems (CSP, SDP and Dish) are available

5. The command execution involves below key operations :-

   1. Active scan timers or command timeouts are cancelled or paused to prevent follow-on automatic actions

   2. Dish Leaf node and Dish master events are unsubscribed for assigned dishes

   3. Assigned resource record , scan durations ,scheduling block Id etc are cleared.

   4. As a part of Restart , command which gets invoked on Dish leaf node is Abort ( Since restart is not present in Dish Master).For other nodes Restart it self gets invoked

   5. The command is then invoked on the relevant TMC CSP, SDP, Dish leaf Nodes after performing few key checks as below :-

      • available check is done for the subsystem

      • Subsystem’s current observation state is inspected; if already EMPTY, ABORTING, the abort call for that subsystem is skipped with a log note..This check is not done for dish leaf node ,since it does not have observation state.

      • Command is then sent to relevant TMC CSP, SDP, Dish leaf Nodes

      • If leaf node rejects/ faces failure in sending restart command , command failure is reported as ‘RESULT_CODE - FAILED’ on Long Running Command Result attribute of the TMC Subarry node.Command will not be sent to remaining subsystems in this case if multiple subsystems are involved .

      • If all leaf node accept command , the TMC Subarray node will wait for command completion.

6. The Sub-array node monitors the progress of command via the Sub-array node ObsState transitions and the long running command results.

   1. Command is successful when the TMC Subarray Node transitions to EMPTY ObsState. This is reported as ‘RESULT_CODE - OK’ on Long Running Command Result attribute of the Subarray node.

   2. Command failure is reported in any of the below cases as ‘RESULT_CODE - FAILED’ on Long Running Command Result attribute of the Subarray node.

      • The CSP Leaf node/SDP Leaf node/Dish Leaf node reports ‘RESULT_CODE - FAILED’ on its Long Running Command Result attribute

      • The command times out if TMC SubarrayNode does not transition to EMPTY within the timeout period specified by CommandTimeOutDefault property specified in helm chart of the TMC Subarray node .