Database Services for CERN

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1 Database Services for CERN Deployment and Monitoring Radovan Chytracek CERN IT Department

2 Outline Database services for physics Status today How we do the services tomorrow? Performance tuning Monitoring Oracle monitoring sensors Status of monitoring Conclusions 11 May 2007 Radovan Chytracek, CERN IT Department 2

3 Database Services for Physics Mandate DB Applications deployment, DB administration, Consulting Data challenges, data distribution between CERN & T1 centers (3D project) Scope LHC & non-lhc experiments ATLAS, CMS, LHCb, Alice + COMPASS & HARP LHC Grid applications FTS, LFC, VOMS, GridView Preparation activities for LHC start-up increase requirements for DB service Number of DB servers, data volume, availability, scalability, automated deployment procedures Having scalable and reliable service is the priority 11 May 2007 Radovan Chytracek, CERN IT Department 3

4 Database Services for Physics Today HW infrastructure Oracle Sun cluster Set of single DB instances SUN cluster overloaded Difficulties to isolate existing applications Not the fastest storage Still on Oracle 9i Maintenance issues for single DB instances Many used to run as stop-gap to off-load SUN cluster, now phased out No load balancing & fail-over Complex maintenance & backup 11 May 2007 Radovan Chytracek, CERN IT Department 4

5 Towards a Scalable Service for LHC Deploying Oracle 10g RAC/Linux Isolation (10g services), Scalability (CPU & storage), Reliability (failover), Manageability (easier to administer) Coordinating work-plan across several IT groups Hardware now in place and acceptance tested RAC configuration and functionality tests going on now Working on automated DB Server install integrated with s/w installation tools used for OS (thanks to IT/FIO) Setting-up several RAC systems 4 x 2-node RAC for LHC experiments 2-node integration + 4-node testing RAC Migrating apps from SUN cluster to RAC by end of May 2007 Radovan Chytracek, CERN IT Department 5

6 Oracle RAC Architecture 11 May 2007 Radovan Chytracek, CERN IT Department 6

7 Steps Towards a Reliable Service Well defined pro-active deployment process Proper planning of database capacity (volume & CPU) Insure the optimization of key applications before production starts Classified database application types Resource consuming applications Guarantee of resources Start low, increase as needed Standard applications Smaller database applications which can run in a shared service Layered service implemented Development Service (code development, low data volumes, no backup) Integration and Validation Service (for key apps) Enough resources for larger tests, consulting available, booking 2 months in advance Production Service Full production quality service (backup, monitoring, on call service) Monitoring to detect new resource consuming applications or changes in access patterns 11 May 2007 Radovan Chytracek, CERN IT Department 7

8 Performance tuning Constant fight on three front-lines HW (CPU, network, storage) Server side (OS, DB, schema design) Client side (bugs, wrong practices, queries) HW can be improved by better iron SW should be safe by not making mistakes New or upgraded apps have the same or new bugs Good schema designs is often difficult Following good practices seems to be tough job too DBAs are inevitable DBAs are inevitable Spit out & analyze the bad things & give advices 24/7 11 May 2007 Radovan Chytracek, CERN IT Department 8

9 Tracing Server side Various levels, session tracing is the most used one Must ship the server trace file back to user Security issues, some development effort required Supported by LCG SW (POOL Oracle plug-in) Client side Required to make the whole picture complete Does not exist out-of-the-box Application code instrumentation needed Often connected to monitoring systems Support being built into LCG SW 11 May 2007 Radovan Chytracek, CERN IT Department 9

10 Monitoring Allow DBAs and developers inspect the current state of a database instance in an easy way without a need for complex software Goal is to enable database & application level monitoring in coherent way with the existing OS level monitoring provided by LEMON Easy access via web interface to quantities and trends describing current database instance behavior with keeping their history and possibility to zoom in a given time period 11 May 2007 Radovan Chytracek, CERN IT Department 10

11 Monitoring Metrics Considered OEM repository but requires OEM infrastructure in place and not all instances are in OEM What if OEM is down? Data kept only 1 month Source: instance s s SYS.V$... performance views The baseline DB metrics extracted from SYS.V$SYSSTAT dynamic performance view Recalculated exactly the same way as done in OEM Examples: SQLNet in/out data rate, logical I/O, physical I/O, SQL per second Application level monitored via SYS.V$SESSION views 11 May 2007 Radovan Chytracek, CERN IT Department 11

12 DB sensor for LEMON version I SQL script executed via SQLPlus Connecting to the locally detected database Shell driver script executed by a simple Perl sensor in LEMON framework Detects local DB settings from /etc/oratab file and names of local oracle daemons (pmon ) LEMON DB Monitored DB instance LEMON framework Activates each 5 mins Communication via pipe DB sensor Captures stdout from driver script lemon_sensor.sh Executes query via Sqlplus and writes data to stdout query lemon_sensor.sql 11 May 2007 Radovan Chytracek, CERN IT Department 12

13 DB sensor for LEMON version II SQL queries still executed via SQLPlus Connecting to the locally detected or remote database SQL*Plus tool wrapped in Perl class module Allows to keep single permanent connection only DB instance & SQL*Plus tool auto detection DDL & DML and queries API provided LEMON DB SQLPlus.pm Monitored DB instance LEMON framework Activates each 5 mins Communication via pipe DB sensor Captures output from Oracle sensor oracle_sensor.pl Executes query via Sqlplus instance query SQLPlus instance result 11 May 2007 Radovan Chytracek, CERN IT Department 13

14 Monitoring status DB LEMON sensors tested on various systems Single DB instances, Oracle 9i/10g LEMON databases RAC systems, Oracle 10g Web display & metrics deployed in LEMON development version Little development needed DB metadata read from OEM repository Clicking a metrics graph in detailed view jumps to zoomable time period view similar to OEM RAC cluster databases shown as computer cluster in LEMON 11 May 2007 Radovan Chytracek, CERN IT Department 14

15 Next steps The monitoring of the WAIT events in progress Performance tuning is difficult without having these Deployment of the new LEMON DB sensor on all physics databases Currently running on selected instances and few RAC nodes Oracle installation procedures need to be updated to include proper monitoring settings 11 May 2007 Radovan Chytracek, CERN IT Department 15

16 Summary Building DB services for LHC is a challenge Well defined pro-active service is required Performance tuning and testing are essential for the resource planning Save some resources by proper monitoring For details about the LEMON system, see talk by Miroslav Siket later this afternoon 11 May 2007 Radovan Chytracek, CERN IT Department 16

17 For the Curious Check out the upcoming LCG Database Deployment And Persistency Workshop 17 October - 19 October May 2007 Radovan Chytracek, CERN IT Department 17

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