The full procedure can be found in the RCG release notes https://dcc.ligo.org/LIGO-T1400570 section 5.7.3, I'll detail what I did yesterday to rebuild and restart the front end models here.

as user controls on h1build:

backup and empty the H1.ipc file in /opt/rtcds/lho/h1/chans/ipc

in /opt/rtcds/lho/h1/release/: perform two run throughs of the make, the first populates the H1.ipc file, the second is a full make and should have no errors. No build errors were seen, so the installWorld was performed.

unalias make

make -i World

make -i World | tee /tmp/make_world_28jul2015_11_15

make installWorld | tee /tmp/install_world_28jul2015_11_39

Then shutdown all the front end models, as controls on h1boot

grep "^h" /diskless/root/etc/rtsystab |awk '{print $1}' > /tmp/front_end_list.txt  

for i in 'cat /tmp/front_end_list.txt';do echo $i;ssh $i /etc/kill_models.sh;done 

I then editied /tmp/front_end_list.txt and removed h1pemmx and h1pemmy (they have to be manually started). We also removed h1sush2a and h1sush34 since they were showing DAC drive errors on previous restarts.

Then start all models

for i in 'cat /tmp/front_end_list.txt';do echo $i;ssh $i /etc/start_models.sh;done

and manually started h1pemmx, h1pemmy, h1sush2a and h1sush34 (did not see a repeat of the DAC drive issues)

All systems started correctly and there were no IPC errors.