[OSM-dev] Yevaud SSD Drive

[Paul Norman]

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.perrin at gmail.com] 
Sent: Thursday, April 12, 2012 2:34 PM
To: dev at 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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