PDFS Distributed File System
Problems with traditional file systems
The traditional file system exists in a single computer, in order
to search for other computer files, you must firstly know the
computer's domain name or IP address, this will bring some problems:
a. Connection problem: first of all, it can not guarantee the
fixed IP address of the machine online, the machine offline situation is
common as a result of machine failure, unknown attacks or network
reason;
b. Efficiency problem: if we all go to a website to download
popular files, it will lead to the centralized file server transmission
channel congestion, the download efficiency is low;
c. Security problem: It need provide the file server IP or domain
name link address for sharing files, if the shared address disclosure,
in fact, it provides a target for hackers to attack directly.
d. Trust problem: Once the machine has been hijacked by hackers ,
the contents of the file you get may be tampered, and it could be
disastrous for using file.
PDFS Distributed File System
PDFS（PeerSafe Distributed File System）is based on P2P Distributed
Hash block file system, which connect the same file system of all
computer equipment. It radically changes the user’s searching way. The
user searches the content hash through PDFS. When the file is added to
the PDFS node, it gets a new name. The name is actually an encrypted
hash, which is calculated from the contents of the file. It uses
encryption to ensure that the hash is always represented the content.
Even if only one bit of data is modified in the file, the hash will be
completely different.The files can be stored in different nodes, the
more the file is accessed by other nodes, the more copies of the file.
So the file can be extracted by some online nodes
When you ask hash to PDFS distributed network, by using a
distributed hash table, it can quickly to find the node that owns the
data and retrieve the data, then use the hash to verify whether it is
the correct data.
PDFS is generic and free storage. The serve files can be large or
small, to a few large file, it will automatically cut into small
pieces, not only the PDFS nodes can download files from a server, but
also to synchronized download from hundreds of servers. PDFS network is a
fine-grained, unreliable, distributed, and easy to combine content
distribution network (Delivery Network Content, CDN). Is very useful for
all types of data, including images, video streams, distributed
databases, operating systems, blockchains, etc.
PDFS does not need to store all of the released contents in the
PDFS of each node. Instead, each node stores only what you want. If each
node is hosting a little data, all data can be provided more space,
bandwidth, and availability than any centralized network through the
accumulation. Distributed network will soon become the world's fastest,
most available, and the largest data storage. No one has the ability to
close all the nodes, so the data will never be lost.
Application
PeerSafe adopt the PDFS distributed file system protocol to
develop the secure and reliable file sharing tool ShadowDisk, through
the point to point communication way to construct distributed file
system network, Address according to the contents of the file hash and
extract the files, Protecting of the contents of the file not be
tampered for free file sharing, and solved the problem of secure and
efficient storage in distributed network.