<p>ok, I made append correctly : <code>--append </code>, not <code>-append</code>, but this wasn't enought:</p>
<pre><code>osm2pgsql --append -s --cache 14000 --proj 3857 -H my.local -d osm -U osm -W -P 5432 russia-latest.osm.pbf
node cache: stored: 0(-nan%), storage efficiency: -nan% (dense blocks: 0, sparse nodes: 0), hit rate: -nan%
Osm2pgsql failed due to ERROR: Cannot detect file format. Try using -r.

</code></pre>

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