Create DRBD Partitions on disk

The commands below assume that /dev/sdb will be used for the DRBD partition.

device=/dev/sdb
dd if=/dev/zero of=${device} obs=512 count=100
dd if=/dev/zero of=${device} obs=512 count=100 seek=$(( $(blockdev --getsz ${device}) -100 ))
parted ${device} "mklabel gpt"
parted ${device} "mkpart primary 0% 100%"

Verify that the partition is created:

fdisk -l /dev/sdb
 
-->
 
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sdb: 274.9 GB, 274877906944 bytes, 536870912 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt
Disk identifier: E7FF3D92-84BB-44E1-B0B0-26150DB80639


#         Start          End    Size  Type            Name
 1         2048    536868863    256G  Microsoft basic primary

Install DRBD Repos

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

Install DRBD Modules

yum -y install drbd90-utils kmod-drbd90

Configure DRBD

Create a DRBD config file for jtelshared on /dev/sdb:

cat <<EOFF > /etc/drbd.d/jtelshared.res
resource jtelshared {
    protocol C;
    meta-disk internal;
    device /dev/drbd1;
    syncer {
        verify-alg sha1;
    }
    net {
        allow-two-primaries;
    }
    on acd-store1 {
        disk   /dev/sdb1;
        address 10.4.8.71:7789;
    }
    on acd-store2 {
        disk   /dev/sdb1;
        address 10.4.8.171:7789;
    }
    startup {
        become-primary-on both;
    }
}
EOFF