[Geocoding] Import run for Europe

[Sarah Hoffmann]

On Tue, Apr 30, 2013 at 05:15:42PM +0100, Simon Nuttall wrote:
> On 29 April 2013 23:42, Simon Nuttall <info at cyclestreets.net> wrote:
> > On 29 April 2013 23:34, Sarah Hoffmann <lonvia at denofr.de> wrote:
> >> On Mon, Apr 29, 2013 at 10:20:55PM +0100, Simon Nuttall wrote:
> >>> On 29 April 2013 08:30, Sarah Hoffmann <lonvia at denofr.de> wrote:
> 
> 8<
> 
> >>> Does it make a lot of difference? Would 32GB be enough to process the
> >>> whole planet or should I just stick to Europe?
> >>
> >> 32GB should be ok for a planet. The more limiting factor is I/O.
> >> If you could add an SSD to the machine that would give you a huge
> >> performance boost, especially when running minutely updates in the background.
> >
> > Noted, thanks.
> 
> OK, we are now considering an SSD.
> 
> What size would you recommend?

We use 2x256GB SSDs in a RAID0. That is enough to comfortably hold all
important tables and indices and leave a bit of room for growth. Beyond
that I have done very little testing. It might be sufficient to have
only a single 256GB disk, which hold the indices and tables on SSD that
are needed for searching (placex, place_addressline, search_name and word).

> Also, we have the option of cheap SSD that wears out quickly or more
> expensive enterprise quality which lasts about 10x longer. What would
> you choose?

My knowledge on the hardware side is rather limited. Just take into
account that Nominatim is doing quite a bit of writing when in minutely
update mode and that you will need to start from scratch if the
data on the SSD is lost.

Sarah