Thanks for the answers so far. The standard map size will be 600 x 400, so given that open layers might request tiles around the visible map area, I had thought that I would be getting at least 16 tile requests per map view. Of course this doesn't take into account people panning around. Our current Google map usage is about 200,000 a day, but we can't tell from the data we have how many are panning around the maps, as Google only count the registering of the API as a hit, not how many tiles are served to the client.
Our load profile is heavily weighted to the evening rather than spread-out evenly throughout the day, so we could hit a spike of ~1,000 requests a second, which the yevaud spec seems to handle ably. John On Thu, Apr 12, 2012 at 10:53 PM, Paul Norman <penor...@mac.com> wrote: > I believe the SSD is used for the database. Before the SSD the DB was on > the RAID10 array. I’m not sure four 300 GB 10k RPM drives are much cheaper > than a SSD.**** > > ** ** > > You might find looking through munin for yevaud helpful - > http://munin.openstreetmap.org/openstreetmap/yevaud.openstreetmap/#disk*** > * > > The SSD is sdd according to the wiki. **** > > ** ** > > How many tiles do you expect each map view to generate? I’d expect at > least 50-100. This would give you an average of 200-500 requests/second. > Just for comparison, the caches in front of yevaud peak at about 3.5k > requests/second**** > > ** ** > > *From:* John Perrin [mailto:john.d.per...@gmail.com] > *Sent:* Thursday, April 12, 2012 2:34 PM > *To:* dev@openstreetmap.org > *Subject:* [OSM-dev] Yevaud SSD Drive**** > > ** ** > > Hi,**** > > ** ** > > I've posted this question on the OSM Q & A site a well, not sure what the > best forum for the question is, so please forgive the dual post if you also > follow that site.**** > > ** ** > > Basically, I was just inquiring into the specific need for the SSD drive > on the yevaud tile server. I'm looking to run an OSM tile server that can > handle roughly 200,000 - 400,000 map views a day and have taken this as a > good benchmark for the server spec. However the SSD is half the cost of > reproducing a server with that spec. I was just wondering exactly what the > disk was used for, and why is specifically needed the SSD drive. I can see > the purchase logged in the server upgrade history, but I can't see any > reason explaining why it was needed.**** > > ** ** > > Thanks**** > > ** ** > > John**** >
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