Like other services, the srm service can be enabled in
the layout file
/etc/dcache/layouts/<mylayout>
of your dCache installation. For an overview of the layout
file format, please see the section called “Defining domains and services”.
Example:
To enable SRM in a separate
<srm-${host.name}Domain> in
dCache, add the following lines to your layout file:
[<srm-${host.name}Domain>]
[<srm-${host.name}Domain>/srm]
The use of the srm service requires an authentication
setup, see Chapter 10, Authorization in dCache for a general
description or the section called “Authentication and Authorization in dCache” for an
example setup with X.509 certificates.
You can now copy a file into your dCache using the SRM,
Note
Please make sure to use latest srmcp client otherwise you
will need to specify -2 in order to use
the right version.
[user] $srmcp file:////bin/sh srm://<dcache.example.org>:<8443>/data/world-writable/srm-test-file
copy it back
[user] $srmcp srm://<dcache.example.org>:<8443>/data/world-writable/srm-test-file file:////tmp/srmtestfile.tmp
and delete it
[user] $srmrm srm://<dcache.example.org>:<8443>/data/world-writable/srm-test-file
The defaults for the following configuration parameters can be
found in the .properties files in the
directory /usr/share/dcache/defaults.
If you want to modify parameters, copy them to
/etc/dcache/dcache.conf or to your
layout file
/etc/dcache/layouts/<mylayout>
and update their value.
Example:
Change the value for srm.db.host in
the layout file.
[<srm-${host.name}Domain>]
[<srm-${host.name}Domain>/srm]
srm.db.host=hostname
The property
srm.request.copy.threads
controls number of copy requests in the running state. Copy
requests are 3-rd party srm transfers and therefore the
property
transfermanagers.limits.external-transfers
is best to be set to the same value as shown below.
srm.request.copy.threads=250
transfermanagers.limits.external-transfers=${srm.request.copy.threads}
The common value should be the roughly equal to
the maximum number of the SRM - to -SRM copies your system
can sustain.
Example:
So if you think about 3 gridftp transfers per pool and you have 30 pools then the number should be 3x30=90.
srm.request.copy.threads=90 transfermanagers.limits.external-transfers=90
Example:
US-CMS T1 has:
srm.request.copy.threads=2000 transfermanagers.limits.external-transfers=2000
Note
SRM might produce a lot of log entries, especially if
it runs in debug mode. It is recommended to make sure that
logs are redirected into a file on a large disk.