cache dir

guys ,
 i have these cache config lines in my squid.conf :

cache_dir ufs /cache/cache1 256 16 256
cache_dir ufs /cache/cache2 256 16 256
cache_dir ufs /cache/cache3 256 16 256
cache_dir ufs /cache/cache4 256 16 256
cache_dir ufs /cache/cache5 256 16 256
cache_dir ufs /cache/cache6 256 16 256
cache_dir ufs /cache/cache7 256 16 256
cache_dir ufs /cache/cache8 256 16 256

i want to increase cache1 and cache2 to bigger size (i.e. 750) and make
the cache config line in my squid.conf looks like these:

cache_dir ufs /cache/cache1 750 16 256
cache_dir ufs /cache/cache2 750 16 256
cache_dir ufs /cache/cache3 256 16 256
cache_dir ufs /cache/cache4 256 16 256
cache_dir ufs /cache/cache5 256 16 256
cache_dir ufs /cache/cache6 256 16 256
cache_dir ufs /cache/cache7 256 16 256
cache_dir ufs /cache/cache8 256 16 256

**notice that cache1 and cache2 are changed from 256 to 750 ...
 my question is , will the cache in cache1 and cache2 be flushed ? or will
remain in there ?

by the way , for all the cache directories i have , namely /cache/cache1 -
cache8 ... they are all in the same partition ..

which is the best cache_dir config ?
  - many directory in one partition or
  - many directory each in different partition or
  - just one big partition ?

please help .. TIA ;)

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