What is the most reliable level of RAID?
什麼是RAID最可靠的級別?
Whether you are setting up a RAID to attach directly to a computer or connecting a NAS on a network, choosing a level of RAID depends on your requirements for performance and data safety. There are multiple levels of RAID, and each uses a specific method for data storage. Some of the most common RAID levels are:
RAID 0 (striping) divides data into separate blocks that are distributed over your storage devices. It provides the fastest retrieval to your files because drive access time is reduced. You need a minimum of two drives to use RAID 0.
RAID 1 (mirroring) creates an identical copy of all of your data onto another drive (or multiple drives). This helps protect the data should one of the drives fail, but you should always have a separate backup of your data in case both drives fail simultaneously—which does happen.
RAID 5 (striping with parity) requires a minimum of 3 drives and offers one of the safest RAID levels. With RAID 5, data is distributed along with parity data, which adds redundancy allowing the RAID to be rebuilt when one of the drives fails.
不論是將RAID設定為直接連接到電腦，還是把網路附接儲存裝置（NAS）連接到網絡，則視乎您對性能及數據安全的要求選擇RAID的級別。RAID有著多種級別，而每一個級別都使用特定的方法儲存數據。最常見的RAID級別是：
RAID 0（分條）將數據分割成獨立的區塊，分佈在您的存儲裝置上。因為驅動器存取時間減少，RAID 0讓您能最快捷地檢索檔案。您需要至少2個驅動器以使用RAID 0。
RAID 1（鏡像）為您所有的數據製作相同的副本，並將其存放在另一個驅動器（或多個驅動器）中。如果其中一個驅動器發生故障，這有助於保護數據。但您應經常為您的數據進行獨立的備份，以防兩個驅動器同時失靈，而這會經常發生。
RAID 5（奇偶分條）需要至少3個驅動器，並提供其中最安全的 RAID 級別之一。使用著 RAID 5，數據與奇偶數據一起分配，當中增加了冗餘，使RAID能在其中一個驅動器出現故障時進行重建。