网络存储备份技术.ppt

* RAID 0 Striping The Diagram to the left shows the basics of the RAID 0 or striping feature. The idea of RAID 0 is to increase performance. When storing information using the striping feature, the data will be split block by block between the two hard disks. Block one will be send to disk one, block two will be sent to disk two, block three will be sent to disk one and block 4 will be sent to disk 2 and so on. This is much faster than a single disk because when reading the data off the disks the twp of them will be working at the same time to retrieve the same file virtually doubling the speed or retrieval and so virtually halving the time of retrieval. As I mentioned this is a performance setup. Should any one of the disks fail the whole array will become corrupt. Most of the files will be split between disks and so will be rendered useless. If you dont have important data on your computer or you have regular backups of what you do need, then a RAID 0 setup would greatly increase your computers disk performance. To get the best out of this system it is wise to use two disks which are the same make and model. If this is not possible then two of the same size and RPM would be useful but not essential. If two disks of different sizes are used in this system then the logical drive will show as the smallest disk. See drive capacities under RAID at the end of this article. * /support/cn/motherboards/server/sb/cs-010763.htm * RAID 1 Mirroring RAID 1 or mirroring gives added security for your data at the cost of storage space. As with striping this setup uses two hard disk drives to produce a single logical drive. In this instance however the total storage space is only the size of one of the disks (the smallest one). This is because with RAID 1 any data that is written to or read from the hard disk is done on the second hard disk exactly the same. If you save a file to your machine, it will will saved on both disks at the same time. This will however affect system per