Steinbuch Centre for Computing

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1 The infrastructure of Grid at KIT Angela Poschlad Steinbuch Centre for Computing Die Kooperation von

2 Outline What is a grid? Gid Grid at tkit GridKa Resources Services Cluster layout Network Monitoring On-call-duty Preproduction system Service Challenges 2 Angela Poschlad Steinbuch Centre for Computing

3 What is a grid A grid is an global allocation of resources (storage and CPUs) at local computing centres with defined services and connected by an efficient network. Through the middleware the usage of the grid is uncoupled from the local batch system. This allows an access to all users without having information about the different site setup. The users of a grid are grouped in Virtual Organisations which h are communities exhibiting the same goals. For example, the participants at the CMS experiment are organised in the VO cms. The grid resources are shared within these VOs. A grid centre can support various VOs and the concept of the membership in VOs allows a simple authorisation of users at the different sites. 3 Angela Poschlad Steinbuch Centre for Computing

4 Grid structure Resources Computing Storage Services Service discovery mechanism Resource Broker Portal machines to resources Storage Elements (SE) Computing Elements (CE) Catalogue Service for data 4 Angela Poschlad Steinbuch Centre for Computing

5 WLCG structure The LHC Computing Grid (LCG) composes different level of importance of grid centres The Worldwide LHC Computing Grid is based on the middleware glite Angela Poschlad Steinbuch Centre for Computing

6 KIT Campus North SCC North SCC South Campus South SCC North GridKa Campus Grid D-Grid reference installation SCC South WLCG Tier 3 maintained by EKP 6 Angela Poschlad Steinbuch Centre for Computing

7 Campus Grid Project for virtualization of a heterogeneous computing environment Scalar processors Vector processors Different memory architecture t (distributed, ib t d shared) Utilization of the resources with grid technology (globus) OpusIB (Opteron-Cluster with InfiniBand, Linux) Open-MPI supported AIX-Server (Power4 and PowerPC) PC) Circa 240 cores 7 Angela Poschlad Steinbuch Centre for Computing

8 DGI Reference Installation Reference installation for D-Grid Support for grid installation Good documented example installation of a grid site Description of the favored architecture and infrastructure Providing of a powerful monitoring User management 8 Angela Poschlad Steinbuch Centre for Computing

9 WLCG Tier 3 Uni Karlsruhe (EKP/SCC) Currently providing a DPM storage element Ab batch cluster is in preparation Using cluster shared between many institutes The cluster is located at SCC South Middleware services will be maintained at Campus North The providing of Worker Nodes can only be achieved using virtualization techniques Other institutes require different OS 9 Angela Poschlad Steinbuch Centre for Computing

10 GridKa - WLCG Tier 1 and more supports all 4 LHC experiments supports non-lhc experiments: CDF, D0, BaBar, Compass supports several D-Grid and non-hep VOs, e.g. Auger, Astrogrid, Medigrid,.. located near Karlsruhe on the KIT north campus Operated by the Steinbuch Centre for Computing 10 Angela Poschlad Steinbuch Centre for Computing

11 Resources at GridKa Computing resources The computing resources can be used by more than 30 VOs Cluster of SL4 32 Bit and SL5 64 Bit Worker Nodes 8620 cores More than 12 TB memory Storage Tape libraries Disk space 11 Angela Poschlad Steinbuch Centre for Computing

12 Services at GridKa Storage Element FTS LFC TopLevel BDII dcache Storage Computing Elements lcg-ce CREAM-CE Unicore Globus Arc-CE Globus Unicore CREAM CE lcg-ce ARC-CE TopLevel BDII LFC FTS VOBoxes MyProxy MyProxy User Interface Resource Broker (WMS/LB) VOBox WMS User Interfaces 12 Angela Poschlad Steinbuch Centre for Computing

13 Computing Elements I The Computing Elements is a portal to the local batch system pbspro p at GridKa Various middleware flavors are supported at GridKa glite lcg-ce and CREAM-CE used by EGEE/WLCG and D-Grid ARC-CE Installation currently ongoing g Asked by Atlas to try Unicore Used by D-Grid Globus Toolkit 4 Used by D-Grid 13 Angela Poschlad Steinbuch Centre for Computing

14 Computing Elements II Users are mapped to local accounts in glite To ensure the same mapping on all CEs the central mapping directory is mounted via nfs (single point of failure) Special users have permission to install software on the VO specific software area Special queue implemented to ensure installation jobs with high priority on the cluster Problems with file system Hit ext3 file system limit of max 32k links in each directory With rising computing resources the number of job rises Using xfs instead 14 Angela Poschlad Steinbuch Centre for Computing

15 Computing Elements III Jobs last week at GridKa Most computing groups use grid techniques Some groups submit local jobs Different number of jobs on the glite CEs CREAM is only used by alice 15 Angela Poschlad Steinbuch Centre for Computing

16 Storage Element Storage is provided by dcache systems Petabytes of disk and tape storage Two instances in production One supporting various VOs One supporting Atlas Recently splitted from old instance Plans Third instance planned supporting all D-Grid VOs Virtual tape library Reduce risk of writing problems Rising risk for reading problems for whole data sets 16 Angela Poschlad Steinbuch Centre for Computing

17 LFC and FTS with Oracle DB Round Robin for FTS web service channels defined on one node LHCb has read-only LFC (Replica CERN LHCb LFC) FTS In case of drop out another machine has to resume the channel LFC LFC LHCb LFC FTS node 1 FTS node 2 FTS node 3 LFC FTS DB LFC DB Hot standby Read-only Oracle DB 2x FTS + 1x LFC 3 data base back-ends for all frontends Stream from CERN Oracle Oracle Oracle CERN LHCb LFC DB 17 Angela Poschlad Steinbuch Centre for Computing

18 File transfer service I The file transfer service (FTS) provides dedicated transfer channel between two grid centres Also possible to define connection to everywhere ( STAR ) Recently new FTS instance installed with version 2.1 SLC 3 -> SL4 Srmls usage configurable Reduce load on SRM/pnfs dcache storage New File Transfer Monitoring (FTM) available 18 Angela Poschlad Steinbuch Centre for Computing

19 File transfer service II 9 VOs supported but only two really active (cms and atlas) The VOs have different data distribution models CMS often uses Site -STAR channel Atlas has dedicated channel for each site More than 70 channel defined 19 Angela Poschlad Steinbuch Centre for Computing

20 Information system I All these services have to be published into a central service discovery system In glite ldap is used for this purpose BDII service has to be implemented at each site Berkely Database Information Index The site BDII collects all information about local services 20 Angela Poschlad Steinbuch Centre for Computing

21 Information System II A central BDII queries a list of site BDIIs and provides this information to the users or other services such as the Resource Broker In EGEE the list is automatically created from a central data base where all sites have to register D-Grid sites are maintained by hand at the moment 21 Angela Poschlad Steinbuch Centre for Computing

22 Information System III There can be various TopLevel BDIIs for a community EGEE TopLevel BDIIs are located at CERN, at each Tier 1 - offered for regional sites - and some other sites such as DESY At GridKa we have different configured BDIIs For WLCG production a RoundRobin with 4 BDIIs is available This service has to scale with the GridKa resources and the regional resources To support D-Grid the Resource Broker (WMS) have a RoundRobin of two BDIIs collecting information of EGEE and D-Grid For monitoring purposes a TopLevel BDII is installed providing all sites Certified, uncertified, D-Grid Grid, PPS sites 22 Angela Poschlad Steinbuch Centre for Computing

23 Resource Broker I User should not locate resources themselves In glite a Resource Broker is used to find proper resources matching the users requirements Wall time Operating system Free slots, small queue Installed software The current Resource Broker is called WMS Workload Management System It works together with a LB Logging and Bookkeeping system The WMS gets the information on the available resources by querying a TopLevel BDII 23 Angela Poschlad Steinbuch Centre for Computing

24 Resource Broker II At GridKa we had up to 6500 jobs operated by one instance at one time and up to 2500 jobs running parallel The service is not allover stable and 24 Angela Poschlad Steinbuch Centre for Computing

25 GridKa Computing Cluster I The GridKa cluster provides 8640 cores Local disk space, and physical and virtual memory, available on worker nodes: Batch (CPU type) /tmp + /tmp/home Phys. Mem. Virt. Mem. # job slots AMD Opteron Intel Xeon Intel Xeon Intel Xeon E Intel Xeon E Intel Xeon L The compute nodes are located in two rooms as most other resources 25 Angela Poschlad Steinbuch Centre for Computing

26 GridKa Computing Cluster II Waste heat is cooled completely with water High computer density on small area without a complex air conditioning system Rooms have air-condition so some racks can be open Each rack is appropriate for an amount of heat of 10 KW New fileserver racks open automatically in case of cooling problems Free for coming storage resources 26 Angela Poschlad Steinbuch Centre for Computing

27 GridKa Computing Cluster III Ventilators for air circulation Rack manager Power supply for nodes Switch heat exchanger 27 Angela Poschlad Steinbuch Centre for Computing

28 GridKa Computing Cluster IV The Worker Nodes are organized rack by rack Each rack has its own private subnet 10.1.rack.host Each rack has a rack manager for logging g (syslog) and configuration Cluster installation is done centrally with Rocks Toolkit Also rack manager For the central administration and configuration cfengine is used Distributing certificates and configuration files to the rack manager Rack manager distributing files to Worker Nodes Software area mounted read-only on most Worker Nodes First node of each rack the software area is mounted in read-write mode do software installation can be done Dedicated sgm queue limited to these hosts 28 Angela Poschlad Steinbuch Centre for Computing

29 GridKa Computing Cluster V Currently we have two sub cluster installed One half with SL4 32Bit Other half with SL5 64Bit This is necessary since not all VOs can handle SL5 yet We decided not to have dedicated queues but dedicated CEs for the different cluster SL5 Cluster SL4 Cluster 2x lcg-ces 2x lcgces lcg-ces 1x CREAM-CE 1x CREAM-CE 1x Unicore 1x Globus Cpu time measurement problems on some SL5 compute nodes 29 Angela Poschlad Steinbuch Centre for Computing

30 Accounting WLCG: Publishing all grid jobs to a central RGMA D-Grid: Published via DGAS April # jobs wall time cpu time Atlas Alice cms Astrogrid LHCb Belle Auger Angela Poschlad Steinbuch Centre for Computing

31 Accounting LHC VOs 31 Angela Poschlad Steinbuch Centre for Computing

32 Network 32 Angela Poschlad Steinbuch Centre for Computing

33 Network II 33 Angela Poschlad Steinbuch Centre for Computing

34 Network III - Automatic failover In March: Link to SARA was down Failover Automatic routing over CERN 34 Angela Poschlad Steinbuch Centre for Computing

35 WLCG Tier 1 GridKa As a tier 1 GridKa has to provide an availability of 98 % Problematic with many updates Maintenances in the computing centre can have affect on GridKa services (DNS, power supply ) Sometimes non-functional updates On-call-duty 24x7 required Some requirements on reaction time cannot be matched with on-callduty Automation needed 35 Angela Poschlad Steinbuch Centre for Computing

36 Monitoring I Central monitoring page at GridKa Providing information on different resources dcache FTS SAM results Ops LCH VOs Status board Interventions incidents Links to other web sites Ganglia Nagios VO dashboards 36 Angela Poschlad Steinbuch Centre for Computing

37 Monitoring II The central monitoring tool used at GridKa is nagios 37 Angela Poschlad Steinbuch Centre for Computing

38 On-call-duty I To provide a 24x7 support different on-call-circles had to be implemented Infrastructure Network Data management and databases Middleware services and GGUS Hardware and server (still missing) Nagios is triggering alarm SMS to on-call-engineer creates ticket t in internal ticket t system Documentation for involved persons and next incident 38 Angela Poschlad Steinbuch Centre for Computing

39 On-call-duty II Business process view in nagios used for problem definition 39 Angela Poschlad Steinbuch Centre for Computing

40 On-call-duty III 40 Angela Poschlad Steinbuch Centre for Computing

41 On-call-duty IV Nagios process schema for Middleware services and GGUS Sensors for GGUS still missing The on-call-engineer is called if Any BDII has problems Less than 2 CEs ate ok Any LFC or FTS problem occurs External sensors are problematic since false positives cannot be controlled 41 Angela Poschlad Steinbuch Centre for Computing

42 On-call-duty V Issues concerning on-call-engineer Every employee has to rest 11 hours without interruption of work between two working days (German law) This is also valid for on-call-engineer What happens in case of incident id in the night? Example: OCE works until 6 pm, then the on call duty starts Incident at 3 am until 4 am only 9 hours rest The rest time has to start again OCE can come to work not before 3 pm But he has to work 40 hours the week The missing hours have to be collected on other working days Maximum of 10 hours a day allowed If this happens too often, the OCE cannot reach the normal working hours and maybe has to come Saturdays 42 Angela Poschlad Steinbuch Centre for Computing

43 VOBoxes and VO logging host Many VOs have their own login node at GridKa Used for VO internal monitoring or file transfer agents Some times a VO likes to have access to some logging files, e.g. FTS logs or gridftp server logs Central logging host implemented at GridKa Some information only accessible by local VO supporters (must have sighed Datenschutzerklaerung ), e ae u other information o is readable e by VO member and some information available for all. 43 Angela Poschlad Steinbuch Centre for Computing

44 Pre-Production Service To minimize impact on the production most updates and changes are tested in the preproduction service (PPS) PPS services running as small virtual machines Enough for functional tests Also new services as the CREAM CE are introduced and tested in PPS In so called service pilots a new system is tested in dedicated sites with the community interested in the service Advantages: Enough time to get used to a new service Good contact with the developers Early discovery of site specific problems 44 Angela Poschlad Steinbuch Centre for Computing

45 CREAM CE Pilot with Alice CREAM CE CREAM: Computing Resource Execution And Management Operated through a VOBOX parallel to the already existing service at GridKa Access to the CREAM CE Initially 30 CPUS (PPS) available for the testing VOBOX CREAM-CLICLI Gridftp For more load temporarily raised to 300 cores Moved later to production ALICE queue 2000 concurrently jobs workmanaged by CREAM during several days 45 Angela Poschlad Steinbuch Centre for Computing

46 CREAM CE Pilot II ALICE production jobs via CREAM CE (ca. 2000) Alice jobs via lcg-ce The two CEs used have the same hardware 46 Angela Poschlad Steinbuch Centre for Computing

47 CREAM CE Pilot III Ongoing testing Load test Test CREAM CE with 5000 managed jobs at the same time For each batch system there is a CREAM CE available in this pilot Problems with WMS to be solved 47 Angela Poschlad Steinbuch Centre for Computing

48 glexec/scas Pilot glexec is used for pilot jobs The mapping on the WN requires a central authorization tool (SCAS) glexec on all production Worker Nodes for scalability test WN glexec SCAS WN glexec WN glexec WN glexec WN glexec WN glexec WN glexec Central Credential mapping WN glexec WN glexec WN glexec WN glexec 48 Angela Poschlad Steinbuch Centre for Computing

49 Service Challenge Soon operation in real production Tests for real incidents ongoing Test ALARM Tickets Raised by each LHC VO with a theoretical incident Workflow test for possible incidents Proceed as it was a real incident First test ticket had no incident specified Second ticket reported failing jobs and assumed a problem with nfs software mounts 49 Angela Poschlad Steinbuch Centre for Computing

50 Security Service Challenge THIS IS A TEST: Consider specific DN as corrupted Workflow Check for user activity and ban user Analyze users activity, e.g. active jobs, which UI was used after analyzing kill jobs Report activity 50 Angela Poschlad Steinbuch Centre for Computing

51 Site admin s everlasting questions/concerns Improve efficiency for service maintenance? New concepts for redundancy? How much virtualization? What enhancements for scalability can be done? PPS engagement? 51 Angela Poschlad Steinbuch Centre for Computing

52 Thank you for your attention! 52 Angela Poschlad Steinbuch Centre for Computing

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