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I have an Adaptec 3805 RAID controller and with two arrays without write cache. Now that I have bought the battery module for this controller, can I now enable the write cache on the existing arrays? Or do I need to delete and re-create new arrays with write cache on?

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You enable/disable the write cache without any other modifications. Just use the same management software you use to create/delete arrays.
You even won't have to reboot.

But I think you make a mistake about Adaptec 3805 RAID controller [...] without write cache. This controller have a write cache. You can use it without the battery. But in case of power loss, the content of the cache is not written to disk.

The purpose of battery backed-up write cache is to allow the cache to be written on disk next time you power on the system.

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Many controllers will not use write caching without a battery –  Kyle Smith Apr 2 '12 at 12:00
    
Got it. I enabled it under Adaptec Storage Manager. I thought it could not be enabled on existing arrays. Thanks! –  Ciguli Apr 2 '12 at 19:13
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