Transfer servers

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Transfer servers

This article lists the JASMIN data transfer servers and provides links to how they can be used.

Please see further articles in the Data Transfer category for details on managing your data transfers.

The standard transfer servers provide a basic and functional service for moving small amounts of data over relatively short distances. However, the high-performance data transfer servers shown above are also available for those with particular requirements.

Please make sure you use the dedicated transfer servers and not the scientific analysis or login servers for any significant data transfers. The transfer servers have been configured to achieve the best transfer rates and will perform significantly better than other servers on jasmin, while maintaining the performance of analysis servers for interactive use by other users.

JASMIN provides specific servers for managing data transfers. These are:

`xfer` servers

Server	Purpose	Access requirements	Further information
`xfer-vm-01.jasmin.ac.uk`	Virtual machine for general purpose data transfers.	`jasmin-login`	Accessible from any network
`xfer-vm-02.jasmin.ac.uk`	Virtual machine for general purpose data transfers.	`jasmin-login`	Accessible from any network
`xfer-vm-03.jasmin.ac.uk`	Virtual machine for general purpose data transfers. Has `cron` for scheduled transfers, see notes.	`jasmin-login`	Accessible from any network.

Notes:

Similar config on all 3 (no domain or reverse DNS restrictions now)
Same advice applies re. SSH client version, see login nodes
If using cron on xfer-vm-03, you must use crontamer
Throttle any automated transfers to avoid many SSH connections in quick succession, otherwise you may get blocked.
Consider using Globus for any data transfer in or out of JASMIN
A new software collection jasmin-xfer has now been added to these servers, providing these tools:

emacs-nox
ftp
lftp
parallel
python3-requests
python3.11
python3.11-requests
rclone
rsync
s3cmd
screen
xterm

`hpxfer` servers

Server	Purpose	Access requirements	Further information
`hpxfer3.jasmin.ac.uk`	Physical machine for higher-performance data transfers	`jasmin-login` access role
`hpxfer4.jasmin.ac.uk`	Physical machine for higher-performance data transfers	`jasmin-login` access role

Notes:

Tested with sshftp (GridFTP over SSH) from ARCHER2
Same applies re. SSH client version, see login nodes
The software collection jasmin-xfer available as per xfer servers, above
The hpxfer role, and the supplying of client IP addresses is no longer required for these new servers.

Avoid getting locked out with SSH transfers

Access rules in place to enable secure SSH connections from any network are sensitive to repeated, rapid connection attempts, which can result in being “locked out”. This may happen when attempting the transfer of several small files in quick succession with separate SSH connections for each. All the above servers behave the same way in this respect, so please be aware of this when managing your transfers.

Users are not permitted to execute commands which require administrative privileges. This applies to all hosts in the managed part of JASMIN where users have SSH login access (for example login, nx-login, sci, xfer and hpxfer machines). In other words, the use ofsu or sudo is not permitted. Please be careful when typing commands, particularly if you have multiple terminal windows open on your own computer, that you do not accidentally attempt sudoon a JASMIN machine: expect some follow-up from the JASMIN team if you do!

GridFTP server

For users of the (now legacy), certificate-based GridFTP only (specifically, gsiftp:// using the globus-url-copy client), there is a new server:

Server	Purpose	Access requirements	Further information
`gridftp1.jasmin.ac.uk`	Physical machine for legacy GridFTP transfers.	No SSH login access. Apply for additional access role here .	Old machine, continue using for now
`gridftp2.jasmin.ac.uk`	Physical machine for legacy GridFTP transfers.	No SSH login access. `jasmin-login` access role	New machine, NOT YET AVAILABLE

Users of this service are now strongly advised to migrate to using Globus instead.

Last updated on 2024-10-16 as part of: updates re hpxfer role (067dba35)

On this page:

Docs

xfer servers

hpxfer servers

Avoid getting locked out with SSH transfers

GridFTP server

`xfer` servers

`hpxfer` servers