To my intense amazement, it seems that NBN Co have finally done sufficient capacity expansion on our local fixed wireless tower to actually resolve the evening congestion issues we’ve been having for the past couple of years. Where previously we’d been getting 22-23Mbps during the day and more like 2-3Mbps (or worse) during the evenings, we’re now back to 22-23Mbps all the time, and the status lights on the NTD remain a pleasing green, rather than alternating between green and amber. This is how things were way back at the start, six years ago.
It occurs to me that I never wrote up the end result of the support ticket I opened with iiNet after discovering significant evening packet loss on our fixed wireless NBN connection in August 2017.
The whole saga took about a month. I was asked to run a battery of tests (ping, traceroute, file download and speedtest, from a laptop plugged directly into the NTD) three times a day for three days, then send all the results in so that a fault could be lodged. I did this, but somehow there was a delay in the results being communicated, so that by the time someone actually looked at them, they were considered stale, and I had to run the whole set of tests all over again. It’s a good thing I work from home, because otherwise there’s no way it would be possible to spend half an hour three times a day running tests like this. Having finally demonstrated significant evening slowdowns, a fault was lodged, and eventually NBN Co admitted that there was congestion in the evenings.
On January 21, 2019 I presented Distributed Storage is Easier Now: Usability from Ceph Luminous to Nautilus at the linux.conf.au 2019 Systems Administration Miniconf. Thanks to the incredible Next Day Video crew, the video was online the next day, and you can watch it here:
If you’d rather read than watch, the meat of the talk follows, but before we get to that I have two important announcements:
- Cephalocon 2019 is coming up on May 19-20, in Barcelona, Spain. The CFP is open until Friday February 1, so time is rapidly running out for submissions. Get onto it.
- If you’re able to make it to FOSDEM on February 2-3, there’s a whole Software Defined Storage Developer Room thing going on, with loads of excellent content including What’s new in Ceph Nautilus – project status update and preview of the coming release and Managing and Monitoring Ceph with the Ceph Manager Dashboard, which will cover rather more than I was able to here.
The Tasmanian state election is coming up in a week’s time, and I’ve managed to do a reasonable job of ignoring the whole horrible thing, modulo the promoted tweets, the signs on the highway, the junk the major (and semi-major) political parties pay to dump in my letterbox, and occasional discussions with friends and neighbours.
We recently had a 5.94KW solar PV system installed – twenty-two 270W panels (14 on the northish side of the house, 8 on the eastish side), with an ABB PVI-6000TL-OUTD inverter. Naturally I want to be able to monitor the system, but this model inverter doesn’t have an inbuilt web server (which, given the state of IoT devices, I’m actually kind of happy about); rather, it has an RS-485 serial interface. ABB sell addon data logger cards for several hundred dollars, but Rick from Affordable Solar Tasmania mentioned he had another client who was doing monitoring with a little Linux box and an RS-485 to USB adapter. As I had a Raspberry Pi 3 handy, I decided to do the same.
This is probably old news now, but I only saw it this morning, so here we go:
WOW. JILL POULSEN’S COLUMN TOMORROW. pic.twitter.com/5kmPa8LHiC
— The NT News (@TheNTNews) September 15, 2017
In case that embedded tweet doesn’t show up properly, that’s an editorial in the NT News which says:
Voting papers have started to drop through Territory mailboxes for the marriage equality postal vote and I wanted to share with you a list of why I’ll be voting yes.
1. I’m not an arsehole.
This resulted in predictable comments along the lines of “oh, so if I don’t share your views, I’m an arsehole?”
I suppose it’s unlikely that anyone who actually needs to read and understand what I’m about to say will do so, but just in case, I’ll lay this out as simply as I can:
- A personal belief that marriage is a thing that can only happen between a man and a woman does not make you an arsehole (it might make you on the wrong side of history, or a lot of other things, but it does not necessarily make you an arsehole).
- Voting “no” to marriage equality is what makes you an arsehole.
The survey says “Should the law be changed to allow same-sex couples to marry?” What this actually means is, “Should same-sex couples have the same rights under law as everyone else?”
If you believe everyone should have the same rights under law, you need to vote yes regardless of what you, personally, believe the word “marriage” actually means – this is to make sure things like “next of kin” work the way the people involved in a relationship want them to.
If you believe that there are minorities that should not have the same rights under law as everyone else, then I’m sorry, but you’re an arsehole.
(Personally I think the Marriage Act should be ditched entirely in favour of a Civil Unions Act – that way the word “marriage” could go back to simply meaning whatever it means to the individuals being married, and to their god(s) if they have any – but this should in no way detract from the above. Also, this vote shouldn’t have happened in the first place; our elected representatives should have done their bloody jobs and fixed the legislation already.)
On June 1, 2017 I presented Understanding BlueStore, Ceph’s New Storage Backend at OpenStack Australia Day Melbourne. As the video is up (and Luminous is out!), I thought I’d take the opportunity to share it, and write up the questions I was asked at the end.
First, here’s the video:
It’s getting close to the fourth anniversary of our NBN fixed wireless connection. Over that time, speaking as someone who works from home, it’s been generally quite good. 22-24 Mbps down and 4-4.5 Mbps up is very nice. That said, there have been a few problems along the way, and more recently evenings have become significantly irritating.
There were some initial teething problems, and at least three or four occasions where someone was performing “upgrades” during business hours over the course of several consecutive days. These upgrade periods wouldn’t have affected people who are away at work or school or whatever during the day, as by the time they got home, the connection would have been back up. But for me, I had to either tether my mobile phone to my laptop, or go down to a cafe or friend’s place to get connectivity.
There’s also the icing problem, which occurs a couple of times a year when snow falls below 200-300 metres for a few days. No internet, and also no mobile phone.
These are all relatively isolated incidents though. What’s been happening more recently is our connection speed in the evenings has gone to hell. I don’t tend to do streaming video, and my syncing several GB of software mirrors happens automatically in the wee hours while I’m asleep, so my subjective impression for some time has just been that “things were kinda slower during the evenings” (web browsing, pushing/pulling from already cloned git repos, etc.). I vented about this on Twitter in mid-June but didn’t take any further action at the time.
Several weeks later, on the evening of July 28, I needed to update and rebuild a Ceph package for openSUSE and SLES. The specifics aren’t terribly relevant to this post, but the process (which is reasonably automated) involves running something like
`git clone email@example.com:SUSE/ceph.git && cd ceph && git submodule update --init --recursive`, which in turn downloads a few GB of data. I’ve done this several times in the past, and it usually takes an hour, or maybe a bit more. So you start it up, then go make a meal, come back and you’re done.
Not so on that Friday evening. It took six hours.
I ran a couple of speed tests:
I looked at my smokeping graphs:
That’s awfully close to 20% packet loss in the evenings. It happens every night:
And it’s been happening for a long time:
Right now, as I’m writing this, the last three hours show an average of 15.57% packet loss:
So I’ve finally opened a support ticket with iiNet. We’ll see what they say. It seems unlikely that this is a problem with my equipment, as my neighbour on the same wireless tower has also had noticeable speed problems for at least the last couple of months. I’m guessing it’s either not enough backhaul, or the local NBN wireless tower is underprovisioned (or oversubscribed). I’m leaning towards the latter, as in recent times the signal strength indicators on the NTD flick between two amber and three green lights in the evenings, whereas during the day it’s three green lights all the time.
The official iRobot Roomba instructional videos show a Roomba doing its thing in an immaculately clean house. When it comes time to clean the Roomba itself, an immaculately manicured woman empties a sprinkling of dirt from the Roomba’s hopper into a bin, flicks no dust at all off the rotor brush and then delicately grooms the main brush, before putting the Roomba back on to charge.
It turns out the cleaning procedure is a bit more involved for two long-haired adults and three cats living on a farm. Note that the terminology used in the instructions below was made up by me just now, and may or may not match what’s in the Roomba manual. Also, our Roomba is named Neville.