[OSM-talk] osmarender tile server broken?

[Nick Hill]

I have spent the afternoon up at UCL working on the machines.

Tilegen went down when transferring the re-built T at H database to dev. dev went 
down early saturday at the time for no apparent reason.

I have identified the causes of the problems, and hope they have now been resolved.

I had mounted a resier 3.6 FS on a loop file system on dev. It appears the 
reiser driver either had a general bug with the kernel version, or had a bug 
when used in loop mode. This caused endless invalid page faults, making the 
machine completely unresponsive.

I have updated the kernel, installed another hard drive for T at H tiles and set 
that up with reiser 3.6. I transferred the so-far generated tile files accross, 
which has not so far generated any invalid page faults.

I found formattign the 160Gb with Reiser 3.6 and 1k blocks took an insane amount 
of time to mount, so considered this may present long term problems. I decided 
to try again with 4k blocks, knowing reiser 3.6 supports tail padding. This 
reduced mount time by a factor of 16.

Oliver- I recommend the use of symlinks for blank tiles. This should improve 
file system integrity and system speed. Perhaps relative symlinks, so the entire 
set of data will still be valid if moved.

Tilegen, although unreachable from outside, was actually working. It appears 
after transferring a certain amount of data, the motherboard was incorrectly 
routing DMA interrupt requests from/to the network cards causing loss of network 
connectivity. After many attempts and trials, I found re-setting the BIOS 
cleared the problem. (I am currently transferring 40G across the network, so 
I'll know for sure in an hour).

Once the data has been transferred back to dev, I can re-start T at H.


David Earl wrote:
> Since yesterday morning, I don't seem to be able to get any osmarender tiles
> at http://www.openstreetmap.org/index.html. All tiles at all zoom levels
> just arrive as 'more osm coming soon'.
> 
> It's not my cache - I've emptied that repeatedly - and it is the same in
> Firefox and IE7. Mapnik tiles seem OK.
> 
> David
> 
> 
> _______________________________________________
> talk mailing list
> talk at openstreetmap.org
> http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
>