网盘容量背后的技术秘密（Technical secrets behind SkyDrive capacity）.docVIP

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网盘容量背后的技术秘密（Technical secrets behind SkyDrive capacity）.doc

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网盘容量背后的技术秘密（Technical secrets behind SkyDrive capacity）

网盘容量背后的技术秘密（Technical secrets behind SkyDrive capacity） Technical secrets behind SkyDrive capacity You want to provide 1G network storage space for each user. If there is a 1000G hard disk on the server, all of the data storage can be provided for users. If each user allocates the maximum storage space of 1G, how many users can not be allocated? You must say 1000/1=1000 users. But the fact that you are so assigned, you will find that each user usually do not upload stuff 1G capacity will account for long, with more or less, but the average user usually only 50M upload files, that is to say, your hard drive will give 1000 1000G for personal use, but only for the benefit 50M*1000=50G space, the space remaining 950G basically completely wasted. So how to solve it? You can change the space distribution of this 1000G for 20000 users, each of the upload limit or capacity of 1G, but usually 50M per person or average upload data, then 20000*50M=1000G, which had valuable storage space on the server to make full use of the. But youre so afraid assigned to 20000 people, in the event of a certain moment it suddenly upload data, then the user is not aware of it you would give to other peoples 1G space is fake? So you can not assign so many people, only 19000 people assigned, leaving some space to make emergency use. Suddenly found that the number of users can be assigned 19 times, ah, amazing. Then there is a way to buy more effective use of it? If I have more than 1000 servers, a 1000G space on the server, so we have to stay on the server 50G and blank space for users to upload large data suddenly cause data with the situation, so my 1000 vacated on the server 1000 *50G= 50000G space is wasted, what does a pity. So we invented the meter storage cluster, so that a user can be assigned to store data on multiple servers, but it looks like just a 1G users in continuous space, then there is no need to set aside on each server emergency room, can even be fully before a server with. I