Mounting of NFS partitions on the TCS Alphas
============================================ 

   In case there is a repeat of the problems with NFS server viss04,
we should be aware that the /wht partition is mounted on the TCS alpha
(lpas4). After recovery of the NFS problems it would be good to alert
operations or the Telescope Operator that action is needed. If the /wht
partition is not mounted then the header for the TCS cannot be written
to /wht/var and one sees that data is missing from the log.

   In addition the operator won't be able to INCLUDE user catalogues
from /wht/cat

Options for mounting the /wht partition are:

1) Shutdown the TCS (with TCSEXIT) and start it again
2) Use the NFSMOUNT option from the menu
3) Log in to a privileged account such as SYSTEM
4) Reboot the alpha with the SHUT account

Option 1 is the most familiar for operations staff
while option 2 saves having to restart the TCS. 

Details for option 2:
--------------------------

Log into lpas4 as WHT_LOGIN with usual password

  This is the WHT TELESCOPE CONTROL SYSTEM

 The TCS is running, using version W52-1-2

  Please enter an option -

 STOP    - Stop the TCS

 TELD     -  Start the TELD task

 RESTART - Restart the TCS user and display windows
            Info display on fjgpc2.ing.iac.es
            USER window on  fjgpc2.ing.iac.es

 DISPLAY  - Select different display devices

 NFSMOUNT -  Mount the ICS Unix partition

 EXIT    - Exit this menu and log out

Option> NFSMOUNT

The mount is performed and the session logged out. I recommend
checking that TCS headers are now being collected. 



Details for option3:
-------------------------

This is for system administrators. Log into lpas4 as SYSTEM

Show the mount

$ ucx sho mount
_DNFS2:[000000] mounted
    viss04.roque.ing.iac.es:/export/whtubuntu
Dismount

$ ucx dism _DNFS2:

In case of problems dismounting try 

$ UCX DISMOUNT /ALL


Mount using command below (this doesn't stop or
start the TCS).

@sys$manager:tcs_startup.com

Details for option 4
-------------------------

This is for use in case all other options have failed.
Shutdown the TCS with TCSEXIT
Telnet into lpas4. Log in as SHUT with the well known password.
Reply YES to the questions
Do you really want to shutdown node LPAS3 [NO]?
Should an automatic system reboot be performed [NO]?

Otherwise the defaults are OK.
When the alpha is up again (this can take up to 10 minutes)
start the TCS as normal.

These notes are for the WHT and lpas4. The procedure is 
similar for the INT and lpas2. The /int partition is mounted
from jupiter as shown below. 

$ ucx sho mount 
_DNFS2:[000000] mounted
    jupiter.ing.iac.es:/mnt/cyan/toptree/int


Frank Gribbin
19 Apr 2017
Version 1.0 Extracted from email to computing staff of 12 Apr 17