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Peter Körner:
Both problems together create a real huge number of files in a single directory which is not good for most filesystems. To make things worse, /mnt/user-store is connected to cassini via NFS, so there's another bottleneck.
i had a look at osm_hillshading/, but i couldn't see any especially large directories. the largest under tiles/ seemed to be about 3'000 entries, which is well within the capability of the filesystem (VxFS).
since user-store is on NFS, it should generate very little local load; while iowait might show as increased load average, it should not have an effect on PostgreSQL speed, which runs on different disks entirely.
- river.