Is there something like Open VMS commons for Rails?

Hello

Back in the days on Digital Open VMS we were using commons to store
large amounts of data in memory instead of going to the database each
request. These commons are flushed to disc so after restarting the
app, the cache is still filled.
Is there a simular product for a Rails environment on Linux? We are
using Memcache in Rails, but I can’t see how memcache can flush his
data to a disc?

Best regards,
Jeroen
ViCi on Rails