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https://www-rt.slac.stanford.edu/rt3/SelfService/Forms/IocNfs.html 

8. How do I start my IOC? Where is my ioc's statrup.cmd?

There are a few scripts that automate this process.

To begin with, there is the 'ipxe.ini' script in the tftp boot area /afs/slac/g/lcls/tftpboot/linuxRT/boot that PXE will run.

This is where the version of (linuxRT) kernel to run is specified as follows:

set vers 3.2.13-121108

This version number can be over-ridden by a chained, host-specific pxe init script to load an image different from the above:

chain ${hostname}.ipxe ||

For example, we have defined a script specifically for our ioc ioc-b34-bd32.ipxe which chooses to load the latest linuxRT image:

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