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The Workload Management System Guide

Installation Guide

Following are some instructions on how to install the latest WMS in certification using native linux installation tool yum and the configuration tool yaim

Update to a more recent version/patch

Configuration Guide

Configuration files

Following are the configuration files for the main services running on a WMS node:

Tuning of some configuration parameters

  • II_timeout: default by yaim is set to 30, increase it for low-memory machines. 4 GB is the minimum suggested for memory
  • MatchRetryPeriod: once a job becomes pending, meaning that there are no resources available, this parameter represents the period between successive match-making attempts, in seconds. The default value is '1000', in order to decrease the number of periodic retries of unmatched jobs the value of this parameter should be increased. A suggested value (used on several production wms) is several hours, '14400'
Select only specific VO resources
Sometimes it could be usefull forcing the WMS to select only resources specific to given VO. This would obviously reduce the matchmaking time and can be achieved providing an additional ldap clause which will be added in the search filter at purchasing time. The default search filter used is:

(|(objectclass=gluecesebind)(objectclass=gluecluster)(objectclass=gluesubcluster)(objectclass=gluevoview)(objectclass=gluece))

The idea is to supply system administrators with the possibility to specify an additional ldap clause which will be added in logical AND to the latest two clauses of the default filter in order to match gluece/gluevoview objectclasses specific attributes. To such an aim the configuration file supply users with:

  • IsmIILDAPCEFilterExt for handling the additional search filter while purchasing information about CE from the BDII

As an example, by specifying the following:

IsmIILDAPCEFilterExt = "(|(GlueCEAccessControlBaseRule=VO:cms)(GlueCEAccessControlBaseRule=VOMS:/cms/*))"

the search filter during the purchasing would be:

(|(objectclass=gluecesebind)(objectclass=gluecluster)(objectclass=gluesubcluster) (&(|(objectclass=gluevoview)(objectclass=gluece)) (|(GlueCEAccessControlBaseRule=VO:cms)(GlueCEAccessControlBaseRule=VOMS:/cms/*))))

and thus the WMS would select only resources (i.e. CE/Views) belonging to CMS.

Service Monitoring Guide

-- ElisabettaMolinari - 11 Apr 2008

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Topic revision: r4 - 2008-05-13 - ElisabettaMolinari
 
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