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Multi Data Center Replication: System Tuning

    Riak Enterprise Only
    This documentation applies only to Riak Enterprise, Basho's commercial extension to Riak. To talk to us about using Riak Enterprise, let us know.

    Depending on the size of your objects, and your replication latency needs, you may need to configure your kernel settings to optimize throughput.

    Linux

    The following settings in /etc/sysctl.conf on Linux have provided very good throughput and latency. These settings are especially helpful when you have more than ~40ms network latency.

    net.ipv4.tcp_rmem = 10240 87380 12582912
net.ipv4.tcp_wmem = 10240 87380 12582912
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_sack = 1
net.core.netdev_max_backlog = 5000

    To reload these settings at runtime:

    sysctl -p /etc/sysctl.conf

    Solaris

    On Solaris the following settings are suggested.

    /usr/sbin/ndd -set /dev/tcp tcp_ip_abort_interval 60000
/usr/sbin/ndd -set /dev/tcp tcp_keepalive_interval 900000
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_initial 3000
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_max 10000
/usr/sbin/ndd -set /dev/tcp tcp_rexmit_interval_min 3000
/usr/sbin/ndd -set /dev/tcp tcp_time_wait_interval 60000
/usr/sbin/ndd -set /dev/tcp tcp_max_buf 4000000
/usr/sbin/ndd -set /dev/tcp tcp_cwnd_max 4000000
/usr/sbin/ndd -set /dev/tcp tcp_xmit_hiwat 4000000
/usr/sbin/ndd -set /dev/tcp tcp_recv_hiwat 4000000