The Treehouse Blog

I recently finished watching the DVD version of The National Parks: America’s Best Idea ^(ad) from Netflix.  First of all, there were many parts that would have looked much better in HD, but alas Netflix doesn’t have the Blu-ray version.  I had also been thinking this would be more of a tour of the parks, forgetting that this was a Ken Burns film.  It turns out to be a thorough history of the parks, which was interesting for the most part.  Trying to place yourself in the America that still had unclaimed wilderness is challenging, though I guess you can still see that in a trip to Alaska.  As to whether national parks are “America’s Best Idea” … I would say that’s a massive exaggeration, but “one of the best ideas” might qualify.

I’d love to see some of these places in person!

I’ve been giving some thought recently to educating myself about the studies behind climate change.  It’s a very charged issue and one that could have profound impacts through either its effects or the effects of trying to combat it.  It’s also one that’s difficult to discuss.  The term “global warming” has lost its literal meaning and now connotes the heat-death of the world with dead Polar Bears and permanently flooded coastlines.  But what are models really predicting and with what certainty?  What data are these models based on, and with what accuracy?  I’ve just about concluded that I can’t trust anyone but myself look at the primary sources and not the distilled summaries, but that sounds like a massive undertaking.

It was brought to my attention recently that the late Michael Crichton had given a speech about his skepticism of “global warming” (the non-literal term) and I had to give it a read.  In case you don’t know, he’s the author of books such as Jurassic Park ^(ad) which I thoroughly enjoyed for their technical detail.  Not to mention he was working on the movie adaptation of his book The Andromeda Strain ^(ad) while still in medical school, if I remember correctly – so a pretty gifted guy.  While I think his speech makes some oversimplifications (just as Al Gore’s An Inconvenient Truth ^(ad) does – yes, I have seen it), there is one point he makes that I emphatically agree with: “I [regard] science as the business of testing theories with measured data from the outside world. Untestable hypotheses are not science but rather something else.”  If I do manage to do some reading on this, that sentiment will be the standard I measure against.

Fedora 9 to 12

Over the past few days I’ve been upgrading my file/media server from Fedora 9 to Fedora 12.  I did this with yum, upgrading from 9 to 10, 10 to 11, and 11 to 12 incrementally, removing conflicts as necessary.  This actually went surprisingly well, and at the end, with just one reboot, I had gone from 9 to 12.

It may have booted, but there were a number of things I had to fix afterwards:

• The kernel video mode setting had to be disabled to not break the NVIDIA binary driver (“blacklist nouveau” somewhere in /etc/modprobe.d/).  Apparently this is supposed to be handled by installing rpmfusion’s kmod package, but that wasn’t the case for me.
• The X server would crash immediately upon a login.  I eventually figured this out to be a missing gnome-session-xsession package.  I’m not sure if this is something I had removed for dependency reasons earlier, or if it was split from another package at some point and yum missed it.  Either way, it was a real pain to debug, but easy to fix.
• The kernel would not recognize the partitions on three of my disks.  This was a major pain, and the main focus of this article.
• I don’t like MythTV 0.22’s new video gallery

Fedora 12 (2.6.31.6-145.fc12.x86_64) Disk Partitions Issue?

So… sdb, sdc, and sde each have a single partition on them, but the kernel (per /proc/partitions and other means) would only report block devices for sdb, sdc, and sde not sdb1, sdc1, and sde1 as should have additionally existed.  Naturally, the first thing to consult would be dmesg:

sda: sda1 sda2 sda3
sdb:
sdc: sdb1
sdc1
sdd:
sde:
sdd1 sdd2 sdd3
sde1
sdf:
sdf1

At first glance, this looks really, really bad.  sdb1 existing on sdc?  That’s not supposed to happen.  But after looking at it further, and having had some experience debugging multi-threaded things, I became convinced this was the mangled output of multiple parallel partition discovery processes.  If that were the case, it looked like it should have been successful, but was not.

So, is this what happened?  Googling turned up a bit on the so-called “fastboot” patches to the Linux kernel, at least portions of which have been accepted into recent mainline kernels.  Supposedly these would only be enabled with the “fastboot” kernel parameter, but searching the source and docs for the latest kernel didn’t turn up this option.  The async libata device discovery does indeed appear to be in 2.6.31 mainline, and I was unable to find a knob to turn it off.  There were also references to this interfering with partition discovery.  I started the process of rebuilding the kernel to disable this, to see if it fixed the problem, but gave up in favor of a workaround.  I’m not fond of maintaining custom kernels – I think the last I did this was to support a boca card.

The workaround.  I had noticed that the kernel could be instructed to reread the partition tables (partprobe, for instance) and the missing partitions would appear.  I threw in a quick init script to do this and assemble the array early in the startup process:

mdadm --stop /dev/md2
sleep 1
partprobe
sleep 2
mdadm --assemble --scan /dev/md2
vgchange -ay
mount /storage

So… if I have time, I should complete that kernel rebuild and report this somewhere.  In the meantime, I’m posting this for the benefit of others.  Lucky for me the partitions affected did not contain my root partition, or this could have been less-work-aroundable.

The Florida expedition was from 11/11 to the early morning of 11/17 and was very successful.  Here’s a summary.  Some people want photos, so I’ll give that a try.

Wednesday. The PA turnpike had next to no traffic from Blue Mountain to Harrisburg East, though had ludicrous 40 mph speed limits posted for much of the distance.  Airport security at Harrisburg was relatively speedy, though they did decide to perform some kind of chemical test on my shoes.  We had an expensive and slow lunch before our flight to Charlotte, NC.   We were a bit late arriving in CLT, it was raining, and there wasn’t much waiting around for the next flight.  The flight to Orlando was uneventful.  We were above the cloud deck much of the time during both flights.  I was only able to get GPS lock very briefly after leaving MDT.  I’d very much like it if GPS worked better inside of aircraft.  The shuttle to the off-site Hertz location was speedy, we got our car, and made our way on the Beachline Express to Cocoa Beach at which point it was dark.  Checked in, got food, and walked the beach a bit.

Atlantis with the STS-129 stack, viewed from Cape Canaveral National Seashore

Thursday.  It was only in the 60s today, and after just having had some Indian Summer in PA, it didn’t feel like we were anywhere tropical.  We walked Cocoa Beach from the pier to Jetty Park in the morning.  We then drove around the Merrit Island Wildlife Refuge.  Had our first view of the shuttle on the pad from the Cape Canaveral Seashore.

Atlantis with the STS-129 stack and pad 39B viewed from camera tracking station

Friday. We were at the KSC visitors complex when it opened, walked around the shuttle Explorer and then boarded our bus for the “NASA Close Up” tour.  The tour took us to the causeway where the lucky 3000 people with the best tickets can watch a launch from the closest allowed distance.  We drove past one of the massive crawler transporters and approached pad 39B which is undergoing modifications to accommodate the Ares rockets.  We parked at a camera tracking station which provided the closest view of the shuttle we had the entire trip.  I was able to get some closer though less clear pictures via binoculars.

Saturn V - S-IC-T

Our next stop was the Apollo / Saturn V Center where we walked under and around a real Saturn V rocket laid over horizontally.  It’s crazy huge – really amazing to see the thing in person.  We then took the bus to the ISS building and were able to look down on the clean room used for processing space station modules – though it was difficult to tell what one was looking at.  Back to the main visitors center, we watched a 3D IMAX film, “rode” the Space Shuttle Launch Experience, and called it a day.

Friday night we drove out to Port Canaveral and parked along the road (where many others were also parked) to see the launch of an Atlas V rocket containing a commercial satellite payload.  I had my radio scanner with me, listening to the Coast Guard announcing the area restricted from boats, and also aircraft dispatched to patrol the area.  We heard that the launch was scrubbed via the scanner, due to technical issues with the rocket.  We headed back to the hotel, not sure how this scrub would affect our chances of seeing a shuttle launch.  The shuttle launch had already been moved from Thursday to Monday because of this rocket, and if this rocket would be ready for another attempt on Saturday or Sunday, the shuttle would again wait.  Fortunately, this launch was put off for more than a week as announced the next day.

Blockhouse Console

Saturday. We returned to the KSC visitor’s center touring more of the exhibits there and watching the other 3D IMAX movie, and had the launch experience again.  After lunch we again boarded a bus for the “Cape Canaveral: Then & Now” tour, for which we had to have our photo IDs checked and recorded, presumably since the tour is largely on the US Air Force’s Cape Canaveral Air Force Station.  We walked through the blockhouse used to control some of the early manned flights, complete with its Burroughs computer, wiring, consoles, blast doors, etc.  This was the one facility we toured that had the appearance of being frozen in time and not a reconstructed prop from a museum.

We also walked around the site of the launch tower where the Apollo 1 fire occurred.  The memorial was very simple compared with the elaborate displays elsewhere, and the tower is gone, with only concrete remaining.

We then went to the Astronaut Hall of Fame and toured its exhibits.  Katelyn and I took a ride on the centrifuge flight simulator.  I wondered why they opened the doors with the ride still spinning, but later figured out it wasn’t.  Pretty cool though.

Kayak Trail

Sunday. We went kayaking on the waters of the Banana River.  We could see dolphins and manatees, but no alligators as it was salt water.  The most interesting part were the “kayak trails” that were essentially tunnels of foliage that you pulled your kayak through by hand.  Really cool, and nothing like we have around home.  In the afternoon we stayed around the hotel, getting in the ocean for a bit (long enough for me to lose my glasses, go figure, but at least I had packed spares).

Launch of STS-129, viewed from Titusville

Monday. This was launch and return trip day.  After escalating concerns about traffic, especially around the visitors center (it sounded as if they would hold us for an hour after launch… by which time who knows how many of the 3k causeway viewers would have been brought back to jam things up) we elected to view the launch from another location.  We checked out and went to the Space View Park in Titusville.  After fooling around with finding a non-towed place to park we waited while the park filled up and then the launch.  It was distant, but very cool to see Atlantis rolling after it left the tower by binoculars.  The pictures don’t do it justice.  After about a minute we could hear the tremendous noise of the launch.

We waited around a few minutes then dashed for the car, and made excellent time without traffic on a highway that is less impacted by launch traffic.  We were able to get home without incident.

Overall, it was an excellent trip.  I’m glad to have had the opportunity to see a Space Shuttle launch before the impending retirement.  I really do want to see one of the real shuttles in person some day, but it may take awhile before they are turned into museum exhibits.

After having watched The Plan, I’ve become convinced that the Cylons were actually just following the leadership of one Bender Bending Rodriguez: “Kill all humans” followed by the occasional “I love you, meatbag.”