Boot a Logical Machine
About the xtbootsys command.
The xtbootsys --partition pN option enables the administrator to indicate which logical machine (partition) to boot. If a partition name is not specified, the default partition p0 (component name for the entire system) is booted. Alternatively, if a partition name is not specified and the CRMS_PARTITION environment variable is defined, this variable is used as the default partition name. Valid values are in the form pN, where N ranges from 0 to 31.
xtbootsys manages a link from /var/opt/cray/log/partition-current to the current sessionid directory for that partition, allowing changes to /var/opt/cray/log/p1-current, for example.