Caches are only valid as long as the Index Searcher is valid. So, if you make
a commit with opening a new searcher then caches will be invalidated.
However, in this scenario you can configure your caches so that the new
searcher will keep a certain number of cache entries from the previous one
(autowarmCount). 
That's the only cache "persistence" Solr can offer. On restarting/crash you
can't reuse caches.

Why do you need to persist caches in case of a crash? What's your usage
scenario?
Do you have problems with performance after startup?

You can read more at http://wiki.apache.org/solr/SolrCaching#Overview



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Thanks,
Michael
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