[OSM-dev] Yevaud SSD Drive

[John Perrin]

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 <penorman at 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.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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