Storing large number of mapsets with many raster maps

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OS X El Capitan, GRASS GIS 7.0.1

I have a location with about 530 read-only mapsets with each about 2600 raster maps (plus PERMANENT and one link to a read-write mapset), overall 1.255.481 raster maps and about 200 GB.

What is the best way of storing these in a space efficient way and tohave them accessible read-only?

I have them at the moment in a grass database and thought of putting these into a squashfs which shouldwork (tried with a subset and it was nice - mounting fast, space efficient), but after two days of compressing (and only having compressed30% - slow speed presumably due to huge number of files) I gave up.

I would like to avoid having to install postgresql as I tried it before(several years ago) and given up due to it's complexity.

I will analyse the maps in R, so any storage backend which I can useFrom R and GRASS would be OK.

Any suggestions?



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