TCS ALPHA REPLACEMENT for the WHT

In the WHT Control Room

• If LPAS5 is still accessible, shut down LPAS5 using the SHUT account from a telnet session; the SHUT account cannot be used from the Alpha's console. Take all defaults. 

In the WHT Computer Room

• LPAS5's system box is in the old CAMAC's rack beside the communications rack in the computers room.
  
• The LPAS5 unit is to the bottom of the rack. It is labelled LPAS5.
• Next shelf from the bottom is for disks and the tape drive. This way disk's SCSI chain can be accesed from both machines.
• The LPAS5 spare unit is on the next shelf, on top of the disks . It is labelled LPAS5 SPARE. It will be left powered off during normal operations.
• When lpas5 has shut down, you should see >>> prompt on the console.
  
• If the >>> is not present, use the reset button on the front (it's recessed, so use an object like a pen)
  
• Power off the system box (switch at the back). Power off the attached disks and tape unit.
  
• Disconnect all cables from LPAS5 system box.
  
• Move all the cables, one by one from lpas5, to lpas5 spare. Pay special attention to the two network cables.  
  
• Power on LPAS5 spare. It should run power on diagnostics and then boot.
  
• System's console is on the table in the back of the rack beside lpas3. It's clearly labeled as LPAS5.
  
• When fully booted there will be a login display on the console.
  

In the WHT Control Room

TCS

• Log into LPAS5 as WHT_LOGIN with usual password
• Start TCS as normal.
  

Unix ICS

• There shouldn't be any need to restart the ICS.
  
• Check that the Unix observing system still communicates with the TCS, using the command tcs page to change TCS info display page.
• Take an exposure and check TCS headers appear in the log display.
  
• Perform general checks on the TCS. Leave telescope tracking. There are checks for autoguiding in the DE notes.
  
• Take an exposure and check correct RA & Dec appear in the log display.(Could also check FITS headers).
  

Notes for software group

• LPAS3 is the TCS development machine. It has a CAMAC interface and is also used as the spare machine for the INT TCS. It doesn't have the same hardware or software configuration as LPAS5. LPAS3 shouldn't be used as a direct replacement for LPAS5.  
  
• LPAS5 has two network connections. 10Mb/s is used for the public connection for address lpas5.ing.iac.es (currently 161.72.6.74). 100Mb/s is used for a private connection to the bridge computer. The ip address of lpas5 on this private network is 192.168.22.168 (on lpas5 there is local name lpas5priv). Use ping from tcsbridge to check this private connection.
  
• Since the LPAS5 spare and LPAS5 have the same ip addresses, only one can be powered on at once.
  

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