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 supporting CMS in a given PhEDEx site we sum up the following attributes:
-
GlueSATotalOnlineSize
-
GlueSAFreeOnlineSize
-
GlueSAUsedOnlineSize
-
GlueSATotalNearlineSize
-
GlueSAFreeNearlineSize
-
GlueSAUsedNearlineSize
-
InstalledOnlineCapacity
-
InstalledNearlineCapacity
The used space should measure the amount of storage capacity in use, while the free space is defined as the total capacity minus the used capacity.
The total space is the same as the installed capacity only if all disk servers are up.
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 |
Disk pledge (TB) |
Pledged disk resources from SiteDB (TB) |
> 1 year old |
> 1 quarter old |
Tape pledge (TB) |
Pledged tape resources from SiteDB (TB) |
> 1 year old |
> 1 quarter old |
Used disk (TB) |
Total used disk from BDII |
< 1 TB or no info |
|
Installed disk (TB) |
Installed Online capacity from BDII |
< 10 TB or no info |
2 * abs(installed - total) / (installed + total) > 10% |
Total disk (TB) |
Total disk from BDII |
< 10 TB or no info |
abs(total - used - free) > 10% |
Free disk (TB) |
Total free disk from BDII |
< 10 TB or no info |
|
Custodial (TB) |
PhEDEx custodial data |
|
|
Non-Custodial (TB) |
PhEDEx non-custodial data |
|
|
Incoming (TB) |
Subscribed data not on site |
|
|
Used tape (TB) |
Total used tape from BDII |
tier-0/1 and < 1 TB or no info |
|
Installed tape (TB) |
Installed Nearline capacity from BDII |
tier-0/1 and < 10 TB or no info |
2 * abs(installed - total) / (installed + total) > 10% |
Total tape (TB) |
Total tape from BDII |
tier-0/1 and < 10 TB or no info |
abs(total - used - free) > 10% |
Free tape (TB) |
Total free tape from BDII |
tier-0/1 and < 10 TB or no info |
|
--
AndreaSciaba - 04-Oct-2011