ScFourServiceDefinition Service Challenge 4 Service Definition

This page defines

  • The products involved in the SC4 service definitions
  • How the products map to services
  • The service parameters

It does not cover the technical aspects of how the service is to be delivered (see ScFourServiceTechnicalFactors for this information).

Service Class

The Service Class is a set of parameters which share the same service level objectives. It permits an easy way of describing the high level parameters required for a service (such as the BDII is a class C rather than the BDII requires 99% availability with 1 hour response time...)

Class Description Downtime Reduced Degraded Avail
C Critical 1 hour 1 hour 4 hours 99%
H High 4 hours 6 hours 6 hours 99%
M Medium 6 hours 6 hours 12 hours 99%
L Low 12 hours 24 hours 48 hours 98%
U Unmanaged None None None None

where

  • downtime defines the time between the start of the problem and restoration of service at minimal capacity (i.e. basic function but capacity < 50%)
  • Reduced defines the time between the start of the problem and the restoration of a reduced capacity service (i.e. >50%)
  • Degraded defines the time between the start of the problem and the restoration of a degraded capacity service (i.e. >80%)
  • Availability defines the sum of the time that the service is down compared with the total time during the calendar period for the service. Site wide failures are not considered as part of the availability calculations. 99% means a service can be down up to 3.6 days a year in total. 98% means up to a week in total.
  • None means the service is running unattended

The service class structure is based on the MoU values.

Calendars

These define the times during the day and in the cycle of accelerator operations. Required service levels change depending on the time of day or year due to changing usage of the systems and the trade-off between cost and reliability.

Calendar Description Accelerator Operating Prime Shift
AP Accelerator operating, prime shift Y Y
AS Accelerator operating, second shift Y N
OP Outside accelerator operations, prime shift N Y
OS Outside accelerator oeprations, second shift N Y

where

  • prime shift is defined as 08:00-18:00 working days
  • second shift is anytime outside of prime shift

The calendar does not address the change of service levels from the early (September 2006) to full production (2007). Service Levels should be defined for the full production state.

Products

A product consists of a set of hardware and software can provide functions for which the availability can be measured. Products make no distinction between development, test or production or between the users. A product does not have a service level associated with them since this is performed at the Service level.

Product Name Short Code Purpose Dvl Org Dvl Contact
Resource Broker RB Farms out jobs to sites+logging and book-keeping   David Smith
MyProxy PX Renew/acquire credentials   Maarten Litmaath
BDII BDII Grid information system   Laurence Field
ComputeElement CE Gateway to local batch system    
R-GMA RGMA Grid Monitoring   Laurence Field
Monbox MONB Grid Monitoring (including Capacity and performance data archiver)   Laurence Field
Grid View GRVW Monitoring    
Site Functional Tester SFT Regular tests of components per site   Piotr Nyczyk, Judit Novak
Grid Peek GRPK Storage of outputs of running jobs   Patricia Mendez
VOMS VOMS Manages mapping of User / Roles / VO   Maria Dimou
LCG File Catalog LFC Maps file names to storage locations   Jean-Philippe Baud, Sophie Lemaitre
File Transfer Service FTS Reliable file transfer delivery   fts-support@cernNOSPAMPLEASE.ch
Storage Element SE SRM Compatible Storage Service    

where

  • Product Name is the usual english words used to describe the code
  • Short Code is a short name which can be used for naming conventions such as hostnames or commands
  • Purpose describes what functions the product delivers
  • Dvl Org is the organisation responsible for development of the software and enhancements
  • Dvl Contact is the primary contact within the Dvl Org

Customers

These are the users of the service.

Customer Customer Code
Alice Z2
Atlas ZP
CMS ZH
LHCb Z5
Shared SH

Services

A service is constructed from a product (desribing what application), a customer (who uses it) and an instance (what is it for).

Service Instance Product Customer Class AP Class AS Class OP Class OS Sup Org Support Contact
RBP Production Resource Broker at CERN RB SH C C C C   David Smith
PXP Production My Proxy at CERN PX SH C C C C   Maarten Litmaath
BDIIP Production BDII for Grid Information System DBII SH C C C C   Laurence Field
BDIIS Production Site BDII at CERN DBII SH H H H H   Laurence Field
CEP Production Compute Element at CERN CE SH C C C C IT/FIO Thorsten Kleinwort
RGMAP Production R-GMA at CERN RGMA SH M M M M   Laurence Field
MONBP Production Monbox at CERN MONB SH M M M M   Laurence Field
GRVWP Production Grid View at CERN GRVW SH M L M L    
SFTP Production Site Functional Tester SFT SH M M M M   Piotr Nyczyk
GRPKP Production Grid Peek Service GRPK SH M M M M   Patricia Mendez
VOMSP Production VOMS VOMS SH C C C C   Maria Dimou
LFCP-ALICE Alice Production LCG File Catalog LFC Z2 H H H H    
LFCP-ATLAS Atlas Production LCG File Catalog LFC ZP H H H H    
LFCP-CMS CMS Production LCG File Catalog LFC ZH H H H H    
LFCP-LHCB LHCb Production LCG File Catalog LFC Z5 C C C C    
FTSP Productuion file transfer service FTS Z2,ZP,Z5 C C C C    
SEP Production CastorGrid and Castor SE SH C C C C    

where

  • Product defines the code which provides the visible function of the service
  • Customer is the primary group using the service. SH (shared) implies the service is used by all experiments
  • Class for each of the calendar windows defines what service class is expected for each of the times defined. Where current software restrictions limit the service possible to deliver, an entry such as M->H should be used to show that the best that can currently be delivered is medium but the requirement is for H. The SC4 tests can be used to validate the feasibility of the requested service level.
  • Sup Org is the organisation providing support for the service who will cover problem resolution and deployment
  • Support Contact is the primary contact point in the Sup Org for the service

ALERT! The MoU minimum requirements for second shift would result in L in the columns for AS and OS. This has been ignored for the purposes of the first version but should be reviewed.

Maintenance Window

For planned changes, the following windows are defined during SC4. Maintenance windows are periods during which the services may run at reduced capacity (class C or H) or unavailable (class M or L) without being considered as downtime in the availability calculations.

These maintenance windows are used for operations such as

  • Software upgrades
  • System reboots where required

The actual window times will be defined later in the SC4 planning.

-- TimBell - 05 Sep 2005

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Topic revision: r15 - 2007-02-14 - FlaviaDonno
 
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