# greenplum specifics in /etc/sysctl.conf
kernel.sem = 250 64000 100 512
kernel.shmmax = 68719476736
kernel.shmmni = 4096
kernel.shmall = 4294967296
kernel.sem = 250 64000 100 512
kernel.sysrq = 1
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
net.ipv4.tcp_syncookies = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.tcp_tw_recycle=1
net.ipv4.tcp_max_syn_backlog=4096
net.ipv4.conf.all.arp_filter = 1
net.core.netdev_max_backlog=10000
vm.overcommit_memory=2

# greenplum specifics in /etc/security/limits.conf
* soft nofile 65536
* hard nofile 65536
* soft nproc 131072
* hard nproc 131072

mdadm --create --verbose /dev/md0 --chunk=2048 --level=raid10 --raid-devices=24 /dev/xvd[b-y]

mkfs.ext4 -v -m .1 -b 4096 /dev/md0
mount -o noatime /dev/md0 /data