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 SRB
enabled globus-url-copy |
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 Overview |
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globus-url-copy, which is an
application of Globus toolkit, copies a file specified
by source URL to a location specified by destination
URL, using the GASS transfer API. It is used to stage
in/out files from/to storage device for executing
jobs. All protocols supported by GASS (local file,
http, https, ftp, and gsiftp) are supported. Piping
to/from stdin/stdout (setting source/dest argument
= '-') is also supported. However, it could not retrieve/save
data from/to storage not to be able to use protocol
supported by GASS. The Storage Resource Broker (SRB)
is client-server middleware that provides a uniform
interface for connecting to heterogeneous data resources
over a network and accessing replicated data sets.
SRB support a lot of interfaces for data resources
including HRM, HPSS, DB2, Oracle, Illustra, ObjectStore,
ADSM, UniTree, UNIX, NTFS, and HTTP. Therefore, we
modify globus-url-copy application to support SRB
protocols as well as GASS protocols for accessing
various data resources and replicated data sets. |
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| SRB
URI |
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The location of data file should
be described with URL format to use globus-url-copy. Thus, the location of data in SRB could be described
with URI format as showed Figure 1. Actually, both
replica and resource are not included in [1]. replica might be used for accessing replicated data sets.
resource might be used to specify the resource name
for creating new data to SRB. |
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srb:// [username.mdasdomain
[.zone] [:password] @] host [:port]
[?replica=replica_id][?resource=resources_name]
[/path]
where square brackets [...] delineate optional
components, the characters :, /, @, and . stand
for themselves, and spaces should be ignored. If
the optional port number is not included, the default
port 5544 will be used. |
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Figure 1. Syntax for SRB URI |
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As above mentioned, the data could be retrieved from
SRB server or be saved to SRB server by specified SRB
URI format. If there are no attributes except replica
and path in specified format, default configuration
will be read in ~/.srb/.MdasEnv file. The ~/.srb/.MdasEnv
file includes following default configuration information
to connect to SRB server. |
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mdasCollectionName : default
collection name
mdasDomainName : default
domain name
srbUser : default SRB user id
srbHost : default host IP of SRB server
srbPort : default host port of SRB server
defaultResource: default storage resource
name
AUTH_SCHEME: default authentication mechanism:
PASSWD_AUTH, GSI_AUTH, and ENCRYPT1
SERVER_DN : server DN of proxy to invoke
SRB server in case of GSI authentication
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| SRB
Authentication |
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| SRB server accepts ENCRYPT1 or GSI authentication.
If password exists, it authenticates to SRB server
via ENCRYPT1 mechanism. Otherwise, by default, it uses
GSI authentication. Because the server DN of proxy
to invoke SRB server must be specified in case of GSI
authentication, the server DN could be read via ?s,
-ss, and ?ds among options of globus-url-copy. If the
option is not specified, the server DN should be described
by SERVER_DN in ~/.srb/.MdasEnv file. |
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| Download |
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| Installation |
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$ tar zxvf globus_gass_copy-srb.tar
$ cd globus_gass_copy-srb
$ mkdir /usr/local/srb
$ tar zxvf SRB3_2_1e.tar.gz ?C /usr/local/srb
$ export SRB_LOCATION=/usr/local/srb/SRB3_2_1e
$ ./install.sh |
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| Configuration |
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| Testing |
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| As globus account, |
$ grid-proxy-init
$ globus-url-copy \
srb://username.userdomain@IPADDRESS/collectaioname/filename
\
file:////tmp/filename
$ more /tmp/filename |
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| Reference |
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| [1] SRB URI Ħ°http://www1.ietf.org/proceedings_new/04nov/IDs/draft-gilbert-srb-uri-00.txtĦħ |
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