Oracle Env. 11G

How does CACHED, non-ordered sequence behave (for PK generation), here is the scenario,
Cache size =10
Node 1 Active - Records created 1,2,3 (3 records total in table)
Node Changes - 2 is Active - Records created 11,12,13, 14 (7 records total in table)
Node Changes - 1 is Active - Records created 21, 22 (or are sequences going to be 4, 5) (9 records total in table)
Node Changes - 2 is Active - No new record added (9 records total in table)
Node Changes - 1 is Active - Records created - Is it going to be 23, 24 OR or is it going to be 6,7 OR or is it going to be 31, 32 (9 records total in table)

Also, What happens to PK numbers at:
* shutdown
* hotbackup
* mirroring whole schema or database to another separate db using storage mirroring
* mirroring whole schema or database to another separate db using datapump

-D