LSRRB stands for Linux Software RAID - Redundant Boot. It is the official name for the Minnow/Guppy project.
This is the public accessible repositoy for LSRRB. You can get the binary package (rpm) from below URL:
http://downloads.linux.hpe.com/SDR/project/lsrrb/
Please check the user guide from below URL:
https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=a00028225en_us (March 2021)