Cain Manor

I’ve been using the TrailGuru application on my iPhone to track my runs.  It’s a very interesting technology (iPhone, is there anything you can’t do?)  Once I have the track from my iPhone, it’s uploaded to the TrailGuru web site.  I then downloaded the waypoints, converted them to GFX waypoints, and then use the Geo Mashup plugin in WordPress to create a map.  This is my first map, and it’s more of an attempt to see if I can do it more than an ongoing exercise.

Continue reading ‘Early September run around the zoo’ »

How does a primary and / or secondary get selected?

• The first 5 hosts that join the VMware HA cluster are automatically selected as “primary nodes
• All the others are automatically selected as “secondary nodes”
• When you do a reconfigure for HA the primary nodes and secondary nodes are selected again, this is random

What’s up with these primaries and secondaries?

• Primary nodes hold cluster settings and all node states which are synced between primaries
• Secondary nodes send their state info(resource occupation) to the primary nodes
• Nodes send heartbeats to each other, primary nodes send heartbeats to primary nodes only and secondary also only to primary. And they do this every second. (Which is a changeable value: das.failuredetectioninterval)

So what if a primary node fails, will a secondary be promoted?

• No, there will only be a new primary appointed when the failed one is removed from the cluster. A secondary will be promoted to primary at random.

But what if all my primary nodes fail?

• This is an unaddressed issue, that’s the reason why you can only account for 4 host failures within a cluster! There needs to be at least one primary!

So when does the gateway come in play?

• Actually the gateway, which is the default “isolation address”, will only be used when an isolation has occurred. So when the AAM client thinks it’s isolated it will check the isolation addresses.

From - Yellow Brick - a very lovely VMWare oriented site.

This article, written by Bruce Schneier, was in Wired Magazine in 2006. Even though time has passed, this is the best explanation as to why privacy - my privacy and your privacy - is so very important. I’ve always had a hard time explaining it, and when I reference this article, I always have a hard time finding it again.

The most common retort against privacy advocates — by those in favor of ID checks, cameras, databases, data mining and other wholesale surveillance measures — is this line: “If you aren’t doing anything wrong, what do you have to hide?” Continue reading ‘The Eternal Value of Privacy’ »