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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)

Column name Definition Red when Yellow when
Custodial (TB) PhEDEx custodial data    
Non-Custodial (TB) PhEDEx non-custodial data    
Incoming (TB) Subscribed data not on site    
Disk pledge (TB) Pledged disk resources from SiteDB (TB) > 1 year old > 1 quarter old
Installed disk (TB) Installed Online capacity from BDII < 1 TB or no info 2 * abs(installed - total) / (installed + total) > 10%
Total disk (TB) Total disk from BDII < 1 TB or no info abs(total - used - free) > 10%
Used disk (TB) Total used disk from BDII < 1 TB or no info  
Free disk (TB) Total free disk from BDII < 1 TB or no info  
Tape pledge (TB) Pledged tape resources from SiteDB (TB) > 1 year old > 1 quarter old
Installed tape (TB) Installed Nearline capacity from BDII tier-0/1 and < 1 TB or no info 2 * abs(installed - total) / (installed + total) > 10%
Total tape (TB) Total tape from BDII tier-0/1 and < 1 TB or no info abs(total - used - free) > 10%
Used tape (TB) Total used tape from BDII tier-0/1 and < 1 TB or no info  
Free tape (TB) Total free tape from BDII tier-0/1 and < 1 TB or no info  

-- AndreaSciaba - 04-Oct-2011

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Topic revision: r3 - 2011-10-04 - AndreaSciaba
 
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