请翻译一下，没看明白
When possible, disable the write cache on volumes that support the online redo logs of the
database, unless you have tested the workings of the battery backup for the cache and have
verified it to be foolproof. The integrity of your database is at stake if Oracle expects redo
entries to be on disk and does not find it at a later time.
对于raid 5 ,关掉cache写得不是更慢了吗？
