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Configuring the srm service

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The Basic Setup

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 11, 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

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Important srm configuration options

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 srmDatabaseHost=localhost in the layout file.

[<srm-${host.name}Domain>]
[<srm-${host.name}Domain>/srm]
srmDatabaseHost=hostname

In the file /usr/share/dcache/defaults/srm.properties you will find the default values

# ---- Database name
srmDbName=dcache

# ---- Database user name
srmDbUser=srmdcache

The defaults for the configuration parameters for the SRM service can be found in /usr/share/dcache/defaults/dcache.properties.

srmCopyReqThreadPoolSize=250
remoteGsiftpMaxTransfers=${srmCopyReqThreadPoolSize}

If you want to modify these values make sure that both srmCopyReqThreadPoolSize and remoteGsiftpMaxTransfers are set to the same values. 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.

srmCopyReqThreadPoolSize=90
remoteGsiftpMaxTransfers=90

Example:

US-CMS T1 has:

srmCopyReqThreadPoolSize=2000
remoteGsiftpMaxTransfers=2000

Note

SRM might produce a lot of log entries, especially if it runs in debug mode. The need to run SRM in debug mode is greatly reduced if SRM monitoring is installed. It is recommended to make sure that logs are redirected into a file on a large disk.