5B4AIT Calendar

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Founder of HamSphere - The virtual Ham Radio experience

Logbook and QSL statistics

Finally I am finished with the Log book and QSL statistics page.
I hope you will like it http://www.hamsphere.com/logstats.php

73
Kelly

New Main Server

The new main server has been installed and it is now up at server6.hamsphere.com
Perhaps you can give me some ping feedback. It seems a lot faster and I am currently transferring data from the old server. We will run both main servers in parallell until July 2012.

73
Kelly

All servers up

After 10 hours work I found the reason for the replication problems and managed to fix it. Database replication is clearly not a walk in the park. Since we have many servers, we always need to let it run for some hours before you can connect the Database “daisy chain” together for full replication. If you connect the chain before it is properly synchronized, the whole system gets instable and starts oscillating with corrupt data as a result.

All servers are go.

73
Kelly

Replication problems

The HamSphere network is using database replication between the servers.
Today I have changed the replication order to optimize the data flow.
Server US, IS,GB and AU will be down during this maintenance.

Kelly

Update

Android / iPhone apps are delayed due to server work. I am still working on transferring data from the old master server to the new. Also I am currently working on the log statistics and report system which is nearly completed.

Kelly

Code writing

Been writing code all week. Working on the extended server platform.
There will also be a newsletter released in a few days.

73
Kelly

REPNE SCASB

When I started writing code back in the 70′s it was all assembly language mnemonic instructions. My first CPU was the Motorola 6502. But soon I would turn into on the Intel track opening up a whole new world of instructions in the 8086 CPU. One of them, “REPNE SCASB”, popped up in my head today. That was an assembler instruction I used quite a lot. (Scanning strings)

And I couldn’t resist thinking of how many REPNE SCASB instructions that are executed even today on every single Intel based server in the world every microsecond. It must be trillions!!!!! Amazing!

Iceland Cloud server

Between 2001 and 2005 I worked at lot with a company on Iceland called Idega HF. I was hired by a Swedish company called CubeCon who used the Icelandic company to develop a rather big platform for the Swedish school system using the idegaweb Java beans J2EE framework. We worked together for some years.

Two of the minds of Idega HF started up a new company called GreenQloud which is a Cloud Server computing company using “green” energy. As you probably know, Iceland has a never ending, abundant stream of and ample energy resource called Thermal Heating which can be converted to electricity. This is what powers the GreenQloud servers.

It felt natural for me to try their platform out for HamSphere and the result you can see now when you start the HamSphere transceiver. Connect to Reykjavik, IS server and you will find it very fast an reliable.

Have in mind that the Icelandic server has a slightly different propagation model based on its location in the North Atlantic. The Icelandic Radio and TV broadcast company have some podcasts relayed on the BC band.

Regards
Kelly
5B4AIT

Hardware failure

It’s been a while since I updated my blog. Have had serious problems with my main server in Sweden. It started to halt/stop on randon occations. The screen just went black. When I examined the logs I could see the following:

Mar 11 04:22:17 server2 kernel: ata1.00: (BMDMA stat 0×20)
Mar 11 04:22:17 server2 kernel: ata1.00: tag 0 cmd 0×25 Emask 0×9 stat 0×51 err 0×40 (media error)
Mar 11 04:22:17 server2 kernel: sd 0:0:0:0: SCSI error: return code = 0×08000002
Mar 11 04:22:17 server2 kernel: sda: Current: sense key: Medium Error
Mar 11 04:22:17 server2 kernel: Additional sense: Unrecovered read error – auto reallocate failed
Mar 11 04:22:17 server2 kernel: end_request: I/O error, dev sda, sector 1305413389
Mar 11 04:22:17 server2 kernel: ata1: EH complete
Mar 11 04:22:17 server2 kernel: SCSI device sda: 1465149168 512-byte hdwr sectors (750156 MB)

It is evidently obvious. Either the Hard disk controller or one of the harddisk are slowly failing.

I have fixed the read error by marking those sectors bad. But this was a serious warning that made me order a brand new server. It will be installed sometime during this week.

At present the server is holding up and it is in operation knock on wood.

Kelly

Cyprus Half Marathon in 1.55.56

Today I ran my first Half Marathon. I finished in 1.55.56. Not a super good time compared to the winning time around 1.16. but I am 100% happy with my result. I was running in the 45-49 Mens group.

Warm up before race.

 

 

 

 

 

Race started at 09.00

 

 

 

 

 

 

Finished race and utterly exhausted

 

 

 

 

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