If you have concerns about RAID 5, and if those concerns have to do with recovering from a disk failure, this article is not going to make you feel any better. Just about every vendor that supplies storage to enterprise data centers offers it, and in many cases it has become -- deservedly - a well-trusted tool. There are however, two major drawbacks associated with using RAID 5. First, while it offers good data protection because it stripes parity information across all the discs within the RAID set, it also suffers hugely from the fact that should a single disc within the RAID set fail for any reason, the entire array becomes vulnerable -- lose a second disc before the first has been repaired and you lose all your data, irretrievably. This leads directly to the second problem. Because RAID 5 offers no protection whatsoever once the first disc has died, IT managers using that technology have faced a classic Hobson's choice when they lose a disc in their array.
How to establish a striped volume (RAID 0) in Windows Server 2003
Selecting the Best RAID Level
The term was coined by David Patterson, Garth A. Data redundancy, although taking up extra space, adds to disk reliability. This means, in case of disk failure, if the same data is also backed up onto another disk, we can retrieve the data and go on with the operation. On the other hand, if the data is spread across just multiple disks without the RAID technique, the loss of a single disk can affect the entire data. RAID is very transparent to the underlying system.
OWC RAID Central
Installation Destination. For example, if you are upgrading or creating a dual-boot system, you should back up any data you want to keep on your storage devices. Unforeseen circumstances can result in loss of all your data. You cannot add or remove partitions or file systems beyond those that the installation program automatically adds or removes.
Diese Redundanz darf keinesfalls mit einer Datensicherung gleichgesetzt werden. Patterson , Garth A. Gibson und Randy H. Dem gestiegenen Ausfallrisiko im Verbund sollte durch die Speicherung redundanter Daten begegnet werden.