GIP is the component that accepts data. It takes dynamic and static information in the LDIF format and merges them: attributes from the dynamic LDIF will override the static LDIF values. After the data has been merged, it checks that the resulting LDIF is well-formed LDIF and validates it against the GLUE Schema.
Dynamic and static information is provided to GIP in different ways. This is described in the following sections.
[root@dcache-node] # ls /opt/glite/etc/gip/ldif/
static-file-dSE.ldif static-file-SE.ldif stub-resource.ldif
The two important files are
static-file-dSE.ldif and
static-file-SE.ldif. Each contains a
series of objects. The following is an example of the LDIF
representation of an LDAP object:
dn: GlueSEControlProtocolLocalID=srm_v2@dcache-node.fzk.de,GlueSEUniqueID=dcache-node.fzk.de ,mds-vo-name=resource,o=grid objectClass: GlueSETop objectClass: GlueSEControlProtocol objectClass: GlueKey objectClass: GlueSchemaVersion GlueSEControlProtocolLocalID: srm_v2@dcache-node.fzk.de GlueSEControlProtocolType: SRM GlueSEControlProtocolEndpoint: httpg://dcache-node.fzk.de:8443/srm/managerv2 GlueSEControlProtocolCapability: space allocation GlueSEControlProtocolCapability: space management GlueSEControlProtocolVersion: 2.2.0 GlueChunkKey: GlueSEUniqueID=dcache-node.fzk.de GlueSchemaVersionMajor: 1 GlueSchemaVersionMinor: 3
These files can be manually edited by the administrator to include additional attributes or objects. Many of the attributes can be customised to express details about the site.
These files will be over written by the dcacheConfigure.sh script. It is important to keep a backup copy whenever they are edited.
Information about dCache's current status is queried by a
small application. This application connects to the
InfoProvider cell to gather the current status of
dCache. It then emits this information as a small amount of
LDIF data, replacing the corresponding LDIF in the static LDIF
files.
If this application isn't able to run, or is unable to gather information about dCache then it will not emit LDIF data, so exposing the default values in the static LDAP files.
The current dynamic information provider has some limitations. We are in the process of evaluating a new information system, which we anticipate being part of the next major release of dCache.