[OSM-dev] Alternative tile webserver needed?

Nick Hill nick at nickhill.co.uk
Fri Apr 27 12:06:53 BST 2007

Hello Sebastien

The tiles drive is 160Gb and is currently running at 80% space usage and rising.

To perform an Rsync on the millions of tile files will take perhaps hours of 
disk I/O each time it is run. I/O time is exactly what is unavailable with the 
current settings.

The problem is simply that the tile generation process is taking every available 
second of disk I/O. Backing off the generator process will provide enough I/O 
time for the tiles to be read and more-or-less solve the problem.

If a more efficient tile generation scheduling algorithm were possible, we could 
save much I/O time by generating fewer tiles and get more useful work done per 
unit time.

Sebastian Spaeth wrote:
> Hash: SHA1
> It seems that the disk of the dev server are at their limit right? So
> would it make sense to serve the tiles from some other machine to at
> least get rid of most of the disk reads (e.g. from infofreeway).
> I have a vserver with 8-10GB spare disk space. If that is enough, I
> could offer to e.g. rsync the tiles every 30 minutes or so and to
> provide tiles to informationfreeway from there. It would get rid of the
> instantanousness of changes but for most requests this should still be
> good enough.
> Let me know if this is of any interest,
> Spaetz

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