rsync is very slow (factor 8 to 10) compared to cp on copying files from nfs-share to local dir. I have the nfs-share mounted locally and compared speed-differences while copying a directory with ~30 files, around 15 vm-images and corresponding log files. The Images are between 8 GB and 600 GB in size.
rsync performs (2x) faster copying than sftp . sftp was achieving around 700 kbps while rsync transfers the data at a rate north of 1.4 Mbps. I know that SFTP and SCP uses the same SSH connection for transferring files.
Options to improve include:
- Using rsync+SSH with a less costly encryption algorithm (e.g. -e "ssh -c arcfour" )
- Eliminating encryption entirely over the SSH transport with something like HPN-SSH.
- Block-based transfers.
- If this is a one-time or infrequent transfer, using tar , netcat ( nc ), mbuffer or some combination.
Approximately one (1) to two (2) minutes after the first viewing, SCP-096 will begin running to the person who viewed its face (who will from this point on be referred to as SCP-096-1). Documented speeds have varied from thirty-five (35) km/h to ¦¦¦ km/h, and seems to depend on distance from SCP-096-1.
Those alternatives are SCP (Secure Copy Protocol) or SFTP (Secure File Transfer Protocol). There is one major difference between FTP and the other 2, though: FTP sends data in plain-text whereas SCP and SFTP use the SSH (Secure Shell) protocol for communication.
Secure Copy, or SCP, does not use FTP or SSL to transfer files, rather Secure Copy handles the file transfer and relies on the SSH protocol to provide authentication and security for both credentials and data. This makes the protocol a security risk if the server is malicious or has been compromised.
SSH provides a secure channel over an unsecured network. The main difference between SSH and SCP is that SSH is used for logging into remote systems and for controlling those systems while SCP is used for transferring files among remote computers in a network.
Since FTP operates over a non-encrypted channel it is faster than SFTP (which is subsystem on top of the SSH version 2 protocol). Also remember that SFTP is a packet based protocol unlike FTP which is command based. This of-course leads to slow transfer rates but very secure transfer.
1) HTTP is faster than FTP when downloading one big file. 2) HTTP can use parallel chunk download which makes it 6x times faster than FTP depending on the network conditions.
The Secure copy (SCP) is a protocol to transfer files via a Secure Shell connection. The SSH file transfer protocol (SFTP) is a related protocol, also relying on a secure shell back-end. Both protocols allow secure file transfers, encrypting passwords and transferred data.
SSH is better at handling NAT. In fact, both ends can be behind NAT which is generally not possible without a lot of crowbar with FTP. FTP is generally faster because of the dead simple nature of the protocol, though the right versions of SFTP can approach that level of speed.
These allow you to manage data transfer using command lines. SCP provides an authentication procedure between the two hosts as well as encryption for the transfer. Secure Copy is cross-platform. There are versions and programs for all standard Windows, macOS, and Linux operating systems as well as for Android and iOS.
FTP should be faster than SMB/CIFS (the protocol Samba implements) if you are just transferring complete files. SMB/CIFS implements a complete filesystem, and that's always going to have more overhead than just sending a bunch of bytes to the other side.
The SSH file transfer protocol has been around for some time, and while its main relevance is providing security in data transfer & access, there's more to it.
2 Answers
- Enable Direct Method Wordpress will be able to install plugins automatically and FTP or SFTP will not be needed.
- Upload plugin zip file via SFTP You can download plugin and then upload downloaded zip file via your SFTP client e.g FileZilla or you can do it from terminal (on Unix Systems) using scp .
Since rsync -aP showed only the "sending incremental file list" message, and nothing else (it'd list differing files or files that were not copied), I conclude that it is the fastest and most reliable way to check whether two directories are identical.
rsync is much faster than cp for this, because it will check file sizes and timestamps to see which ones need to be updated, and you can add more refinements. You can also use rsync to copy or sync files to a remote machine, or make is run as a daemon.
cwRsync is an implementation of rsync for Windows. rsync uses a file transfer technology specified by the rsync algorithm, transferring only changed chunks of files over the network. cwRsync can be used for remote file backup and synchronization from/to Windows systems.
Summary: scp can transfer files between two remote hosts while rsync doesn't support it.
How to Use SCP Command to Securely Transfer Files
- SCP Command Syntax.
- Before you Begin.
- Copy Files and Directories Between Two Systems with scp. Copy a Local File to a Remote System with the scp Command. Copy a Remote File to a Local System using the scp Command. Copy a File Between Two Remote Systems using the scp Command.
scp will overwrite the files if you have write permissions to them. In other words: You can make scp effectively skip said files by temporarily removing the write permissions on them (if you are the files' owner, that is). before running scp (it will complain and skip the existing files).
To copy a directory (and all the files it contains), use scp with the -r option. This tells scp to recursively copy the source directory and its contents. You'll be prompted for your password on the source system ( deathstar.com ). The command won't work unless you enter the correct password.
rsync performs no encryption on its own. If you don't use ssh, nor do you tunnel the rsync traffic through stunnel or some kind of VPN, then no encryption is performed.
However, the scp command doesn't have resume option, so it will simply start copying the files from the beginning and overwrite the existing files. This is bit annoying and time-consuming task. This is where Rsync utility comes in handy! We can easily resume partially transferred files over SSH using Rsync.
scp basically reads the source file and writes it to the destination. It performs a plain linear copy, locally, or over a network. rsync also copies files locally or over a network. But it employs a special delta transfer algorithm and a few optimizations to make the operation a lot faster.
- Copy/Sync Files and Directory Locally.
- Copy/Sync Files and Directory to or From a Server.
- Rsync Over SSH.
- Show Progress While Transferring Data with rsync.
- Use of –include and –exclude Options.
- Use of –delete Option.
- Set the Max Size of Files to be Transferred.
- Automatically Delete source Files after successful Transfer.
