Frequently Asked Questions

Contents


Getting Started


Using the Testbed


Hardware Setup


Software Setup

  • What if I need more disk space on my nodes?

    Each node has a partition at the end of the disk that you can use if you wish. In Linux, the partition is /dev/hda4 ; in FreeBSD, it's /dev/ad0s4 . There is no filesystem on this partition, so you'll need to create it yourself. For example, in Linux:

    mkfs /dev/hda4;
    mount /dev/hda4 /mnt;
    This partition is only 6 Gigs, the size of the leftover space on our smallest drives. If you need more space than this, it would be possible to enlarge this partition on some machines (for example, our pc850s have 40 GB disks,) but that is outside the scope of this FAQ.

  • Are there testbed-specific daemons that could interfere with my experiment?

    The only daemon that the testbed adds to the OS's standard set is healthd. This daemon periodically polls things such as motherboard/CPU temperature and fan speed, and reports them back to our boss node. We have picked a large polling interval (five minutes) to minimize the impact on nodes. If you are worried about side effects, however, you can safely kill it off. healthd is stared by /etc/testbed/rc.healthd .

    If you have requested automatic routing on your nodes with the tb-set-ip-routing command in your NS file, this will start gated on all of your nodes.

    We have left all daemons started by the operating systems' default configurations (such as cron) enabled, so you should also look at them if you are concered about running processes affecting your experiment.


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