% DPARAM(5) gtransfer 0.2.0 | Configuration files % Frank Scheiner % Aug 19, 2013
default param (dparam) - defines optimized data transfer parameters between source and destination of a gtransfer data transfer
$HOME/.gtransfer/dparams/*
[...]/dparams/*
Default parameters (dparams) can be defined for specific source destination
combinations, given the fact, they describe direct connections. A direct
connection is defined as having no transit site between source and destination.
The default parameters are usually consisting of the best performing parameter
configurations for the globus-url-copy(1)/tgftp(1) tool for the
corresponding connection. These can be determined by executing data transfer
tests between the specific source and destination.
Dparams can be created either manually or via the dparam(1) tool. Please see
dparam(1) for more information.
Dparams are named after the SHA1 hash of the corresponding source and
destination (separated by a ;) used during creation. E.g. a dparam with
gsiftp://host1.domain.tld:2811 as source and gsiftp://host3.domain.tld:2811
as destination will be named 799f02cde51576d5f620b8450a37e65d48883801. This
way gt can select the correct dparam for a transfer by calculating the SHA1 hash
of the source and destination. The dparam(1) tool also links the dparam file
with an alias symlink that makes it easier to inspect specific dparams.
When transferring data from source to destination, gtransfer will automatically use the corresponding dparam for the specific transfer providing optimized data transfer performance without user intervention.
<source>
gsiftp://host1.domain.tld:2811
</source>
<destination>
gsiftp://host3.domain.tld:2811
</destination>
<gsiftp_params>
-p 4 -tcp-bs 16M -cc 8 -stripe -cd
</gsiftp_params>A dparam file consists of XML like tags, attributes and values. As gt does not make use of a real XML parser, (start and end) tags and values have to be written on a single line each as shown in the example.
gtransfer(1), dparam(1), sha1sum(1), tgftp(1), globus-url-copy(1)