Background
DEIMOS rotation is controlled by roto, a diskless
Linux PC that resides in the DEIMOS cradle. Although the
system is typically very robust, it may occasionally require a
reboot, especially if keamano has been rebooted. If
restarting the rotator daemons by executing
deirot_restart
on keamano as user kics fails to fix the rotator, then
try a soft or hard reboot as described below.
Soft Reboot
If you are able to log into roto, then the preferred
reset method is to perform a soft reboot as follows:
- From keamano, execute
ssh root@rotop
to log in with the password shown in the password file. This
is typically not the standard root password but may be reset
to the standard password on a reboot of keamano.
If needed, ask a sysadmin to log in with the stradard root
password.
- Once you are logged in as root, restart the system with
reboot -f
This should restart the system and the deirot
daemons.
Hard reboot
If you can't log in to roto, then the only way to
reboot the system is to power cycle the machine. Someone at the
summit must follow this procedure to perform a hard reboot on
roto:
- Go to the side of the instrument with the hand paddle.
From the back of the instrument, facing the telescope, this is
the right side.
- Move the hand paddle to the side, and remove Panel C (see
figure 1 below) to gain access to the
buttons. No screws need to be undone; the panel just rests on
a couple of pegs. The panel has a handle on it and just lifts
off.
- Locate the Linux PC, which lives in a pizza-style box
within the bay.
- Press the computer reset button on the PC (see figure 2 below).
- Wait 60 seconds for the system to reboot. Run testAll to confirm that the rotator
software is up and running.
- Put the handpaddle into manual mode and attempt to rotate
the instrument using the handpaddle. If it will rotate,
then roto and the deirot software are
both running.
Figure 1. Panel to be removed for resetting rotator.
Figure 2. Location of rotator reset buttons.