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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