In the standard configuration the dCache web interface is started on the admin node and can be reached via port 2288. Point a web browser to http://<adminNode>:2288/ to get to the main menue of the dCache web interface. The contents of the web interface are self-explanatory and are the primary source for most monitoring and trouble-shooting tasks.

The “Cell Services” page displays the status of some important cells of the dCache instance. You might observe that some cells are marked “OFFLINE” even though you know that they are running and fine. These might be the cells “SRM”, “GFTP”, and “DCap-gsi”. The reason is that the names of the cells monitored by the web interface are explicitly configured in the file /opt/d-cache/config/httpd.batch. However, the cells have other names. If you change the following section near the end of the file

#
create diskCacheV111.cells.WebCollectorV3 collector \
    "PnfsManager \
     PoolManager \
     GFTP \
     SRM \
     DCap-gsi \
     -replyObject"
#

such that it reads

#
create diskCacheV111.cells.WebCollectorV3 collector \
    "PnfsManager \
     PoolManager \
     GFTP-<adminNode> \
     SRM-<adminNode> \
     DCap-gsi-<adminNode> \
     -replyObject"
#

and restart the httpDomain domain by executing

[root] # /opt/d-cache/jobs/httpd stop
[root] # /opt/d-cache/jobs/httpd -logfile=/opt/d-cache/log/http.log start

More information about the <domainName>.batch will follow in the next section.

The “Pool Usage” page gives an good overview of the current space usage of the whole dCache instance. In the graphs, free space is marked yellow, space occupied by cached files (which may be deleted when space is needed) is marked green, and space occupied by precious files, which cannot be deleted. Other states (e.g., files which are currently written) are marked purple.

The page “Pool Request Queues” (or “Pool Transfer Queues”) gives information about the number current requests handled by each pool. “Actions Log” keeps track of all the transfers performed by the pools up to now.

The remaining pages are only relevant with more advanced configurations: The page “Pools” (or “Pool Attraction Configuration”) can be used to analyze the current configuration of the pool selection unit in the pool manager. The remaining pages are relevant only if a tertiary storage system (HSM) is connected to the dCache instance.