For SLE 12 SP1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:steffens:lvermgeo:server/SLE_12_SP1/home:steffens:lvermgeo:server.repo
zypper refresh
zypper install drbd
For SLE 11 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:steffens:lvermgeo:server/SLE_11_SP4/home:steffens:lvermgeo:server.repo
zypper refresh
zypper install drbd
For SLE 11 SP3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:steffens:lvermgeo:server/SLE_11_SP3/home:steffens:lvermgeo:server.repo
zypper refresh
zypper install drbd