New MyBook Duo 4Tb astonishingly slow... I mean, really soul-numbingly slow

WD Legacy Products My Book Live Duo
14

Sebi,

Something is wrong with your setup. Are you willing to “tune” your AFP client settings on your iMac to improve performance? I am getting an average of 30Mbps via AFP for Time Machine and 40Mbps+ via Samba.

My setup as follow:

  • MacBook Pro 2.4Ghz Intel Core i5, 4GB RAM 1067MHz DDR3 on Mac OS X 10.7.4
  • TP-Link TL-WR1043ND Wireless Gigabit router
  • Gigabit Ethernet connection from MacBook Pro to LAN

APF client on MacBook Pro tuned due to the “delay” caused by a little-known interaction between Nagle’s Algorithm and Delayed ACK. For a detailed description of the problem please read this article.

To fix it, do the following:

  1. Open a terminal window o your Mac OS X and type:

    su -

    (to switch to user root

   

    password: ******** (whatever your password is)

   

    vi /etc/sysctl.conf

OR use whatever editor you feel most comfortable with to create or modify: /etc/sysctl.conf

  1. Enter the following lines in the config file /etc/sysctl.conf;

net.tcp.delayed_ack=2
net.inet.tcp.sendspace=2097152
net.inet.tcp.recvspace=2097152
net.inet.tcp.maxseg_unacked=32

Now, reboot your iMac and test the data throughput and share your outcome. If this solves your challenge, please click “Problem Solved”. 

Regards,

Moonshi

2 Likes