Bsd Now

This week, we are going to be talking with Aaron Poffenberger, who has much to share about his first-hand experience in infiltrating Linux conferences with BSD-goodness. This episode was brought to you by Headlines Alexander Motin implements CTL High Availability (https://svnweb.freebsd.org/changeset/base/r287621) CTL HA allows two .head. nodes to be connected to the same set of disks, safely An HA storage appliance usually consists of 2 totally separate servers, connected to a shared set of disks in separate JBOD sleds The problem with this setup is that if both machines try to use the disks at the same time, bad things will happen With CTL HA, the two nodes can communicate, in this case over a special TCP protocol, to coordinate and make sure they do not step on each others toes, allowing safe operation The CTL HA implementation in FreeBSD can operate in the following four modes: Active/Unavailable -- without interlink between nodes Active/Standby -- with the second node handling only basic LUN discovery a