Storage information in the Site Status Board

This page explains the information published in the SSB via a specialized view called 'storage'.

First of all, a Data Service query returning all PhEDEx nodes is used to:

• find all nodes in a site
• the SE for each node

Second, the BDII is queried, and for all Storage Areas in a given PhEDEx site we sum up the following attributes:

• GlueSATotalOnlineSize
• GlueSAFreeOnlineSize
• GlueSAUsedOnlineSize
• GlueSATotalNearlineSize
• GlueSAFreeNearlineSize
• GlueSAUsedNearlineSize
• InstalledOnlineCapacity
• InstalledNearlineCapacity

Third, for each site with PhEDEx nodes, we use queries like

https://cmsweb.cern.ch/phedex/datasvc/xml/prod/nodeusage?node=$node

to extract these parameters:

• cust_node_bytes
• cust_dest_bytes
• noncust_dest_bytes
• noncust_node_bytes

and define

incoming      = cust_dest_bytes + noncust_dest_bytes - cust_node_bytes - noncust_node_bytes
custodial     = cust_node_bytes
non_custodial = noncust_node_bytes

The following table summarizes all columns in the SSB and describes when a value is marked red (meaning an error condition)

-- AndreaSciaba - 04-Oct-2011