Fabric Monitor, Accounting, Storage and

Reports experience at the INFN Tier1

Felice Rosso on behalf ofINFN Tier1

Felice.Rosso@cnaf.infn.it

Workshop sul calcolo e reti INFN - Otranto - 8-6-2006

Outline• CNAF-INFN Tier1• FARM and GRID Monitoring• Local Queues Monitoring

– Local and GRID accounting

• Storage Monitoring and accounting• Summary

Introduction• Location: INFN-CNAF, Bologna (Italy)

–one of the main nodes of GARR network• Computing facility for INFN HNEP

community–Partecipating to LCG, EGEE, INFNGRID projects

• Multi-Experiments TIER1–LHC experiments (Alice, Atlas, CMS, LHCb)–CDF, BABAR–VIRGO, MAGIC, ARGO, Bio, TheoPhys, Pamela ...

• Resources assigned to experiments on a yearly Plan.

The Farm in a Nutshell - SLC 3.0.6, LCG 2.7, LSF 6.1

- ~ 720 WNs LSF pool (~1580 KSI2K)- Common LSF pool: 1 job per logical cpu (slot)

- MAX 1 process running at the same time per job

– GRID and local submission allowed• On the same WN can run GRID and not GRID jobs• On the same queue can be submitted GRID and not GRID jobs

– For each VO/EXP one or more queues– Since 24th of April 2005 2.700.000 jobs were

executed on our LSF pool (~1.600.000 GRID)– 3 CEs (main CE 4 opteron dualcore, 24 GB RAM) + 1 CE

gLite

Access to Batch system

“Legacy” non-Grid Access

CE LSF Wn1 WNn

SE

Grid Access

LSFclient

UIUI UI

Grid

Farm Monitoring Goals• Scalability to Tier1 full size• Many parameters for each WN/server• DataBase and Plots on Web Pages• Data Analysis• Report problems on Web Page(s)• Share data with GRID tools• RedEye: INFN-T1 tool monitoring• RedEye: simple local user. No root!

Tier1 Fabric MonitoringWhat do we get?• CPU load, status and jiffies• Ethernet I/O, (MRTG by net-boys)• Temperatures, RPM fans (IPMI)• Total and type of active TCP connections• Processes created, running, zombie etc• RAM and SWAP memory• Users logged in• SLC3 and SLC4 compatible

Tier1 Fabric Monitor

Local WN Monitoring• On each WN every 5 min (local crontab) infos are

saved locally (<3KBytes --> 2-3 TCP packets)• 1 minute later a collector “gets” via socket the infos

– “gets”: tidy parallel fork with timeout control

• To get and save locally datas from 750 WN ~ 6 sec best case. 20 sec worst case (timeout knife)

• Upgrade DataBase (last day, week, month)• For each WN --> 1 file (possibility of cumulative plots)

• Analysis monitor datas• Local thumbnail cache creation (web clickable)• http://collector.cnaf.infn.it/davide/rack.php• http://collector.cnaf.infn.it/davide/analyzer.html

Web Snapshot CPU-RAM

Web Snapshot TCP connections

Web Snapshot users logged

Analyzer.html

FabricGRID Monitoring• Effort on exporting relevant fabric metrics

to the Grid level e.g.:– # of active WNs, – # of free slots, – etc…

• GridICE integration– Configuration based on Quattor

• Avoid duplication of sensors on farm

Local Queues Monitoring• Every 5 minutes on batch manager is saved

queues status (snapshot)• A collector gets the infos and upgrades the

local database (same logic of farm monitoring)– Daily / Weekly / Monthly / Yearly DB– DB: Total and single queues

• 3 classes of users for each queue• Plots generator: Gnuplot 4.0• http://tier1.cnaf.infn.it/monitor/LSF/

Web Snapshot LSF Status

UGRID: general GRID user (lhcb001, lhcb030…)SGM: Software GRID Manager (lhcbsgm)OTHER: local user

UGRID: general GRID user (babar001, babar030…)SGM: Software GRID Manager (babarsgm)OTHER: local user

RedEye - LSF Monitoring• Real time slot usage • Fast, few CPU power needed, stable, works on WAN • RedEye simple user, not root

BUT…1. all slots have the same weight (Future: Jeep solution)2. Jobs shorter than 5 minutes can be lost

SO:We need something good for ALL jobs.

We need to know who and how uses our FARM.

Solution:Offline parsing LSF log files one time per day (Jeep integration)

Job-related metricsFrom LSF log file we got the following non-GRID info:

• LSF JobID, local UID owner of the JOB• “any kind of time” (submission, WCT etc)• Max RSS and Virtual Memory usage• From which computer (hostname) the job was

submitted (GRID CE/locally)• Where the job was executed (WN hostname)• We complete this set with KSI2K & GRID infos

(Jeep)• DGAS interface http://www.to.infn.it/grid/accounting/main.html

• http://tier1.cnaf.infn.it/monitor/LSF/plots/acct/

Queues accounting report

Queues accounting report

Queues accounting report

Queues accounting report

• KSI2K [WCT] May 2006, All jobs

Queues accounting report

• CPUTime [hours] May 2006, GRID jobs

How we use KspecINT2K?- 1 slot → 1 job- http://tier1.cnaf.infn.it/monitor/LSF/plots/ksi/

- For each job:

KSI2K T1-INFN Story

KSI2K T1-INFN Story

Job Check and Report• Lsb.acct had a big bug!

– Randomly: CPU-user-time = 0.00 sec– From bjobs -l <JOBID> correct CPUtime– Fixed by Platform at 25th of July 2005

• CPUtime > WCT? --> Possible Spawn• RAM memory: is a job on the right

WN?• Is the WorkerNode a “black hole”?• We have a daily report (Web page)

Fabric and GRID monitoring

• Effort on exporting relevant queue and job metrics to the Grid level. – Integration with GridICE– Integration with DGAS (done!)– Grid (VO) level view of resource usage

• Integration of local job information with Grid related metrics. E.g.:– DN of the user proxy– VOMS extensions to user proxy– Grid Job ID

GRID ICE

• Dissemination http://grid.infn.it/gridice

• GridICE server (development with upcoming features)

• http://gridice3.cnaf.infn.it:50080/gridice

• GridICE server for EGEE Grid

• http://gridice2.cnaf.infn.it:50080/gridice

• GridICE server for INFN-Grid

• http://gridice4.cnaf.infn.it:50080/gridice

GRID ICE• For each site check GRID services (RB, BDII,

CE, SE…)• Check service--> Does PID exist?• Summary and/or notification• From GRID servers: Summary CPU and

Storage resources available per site and/or per VO

• Storage available on SE per VO from BDII• Downtimes

GRID ICE

• Grid Ice as fabric monitor for “small” sites

• Based on LeMon (server and sensors)• Parsing of LeMon flatfiles logs• Plots based on RRD Tools• Legnaro: ~70 WorkerNodes

GridICE screenshots

Jeep• General Purpose collector datas (push

technology)• DB-WNINFO: Historical hardware DB (MySQL

on HLR node).• KSI2K used by each single job (DGAS)• Job Monitoring (Check RAM usage in real time,

efficiency history)• FS-INFO: Enough available space on volumes?• AutoFS: all dynamic mount-points are working?• Match making UID/GID --> VO

The Storage in a Nutshell• Different hardware (NAS, SAN, Tapes)

– More than 300 TB HD, 130 TB Tape• Different access methods (NFS/RFIO/Xrootd/gridftp)

• Volumes FileSystem: EXT3, XFS and GPFS• Volumes bigger than 2 TBytes: RAID 50

(EXT3/XFS). Direct (GPFS)• Tape access: CASTOR (50 TB of HD as stage)• Volumes management via Postgresql DB• 60 servers to export FileSystems to WNs

Storage at T1-INFN• Hierarchical Nagios servers to check services

status– gridftp, srm, rfio, castor, ssh

• Local tool to sum space used by VOs• RRD to plot (volume space total and used)• Binary and owner (IBM/STEK) software to check

some hardware status.• Very very very difficult to interface owner

software to T1 framework• For now: only e-mail report for bad blocks, disks

failure and FileSystem failure• Plots: intranet & on demand by VO

Tape/Storage usage report

Summary• Fabric level monitoring with smart report is

needed to ease management• T1 has already solution for 2 next years!• Not exportable due to man-power (no

support)• Future at INFN? What is T2s man-power?• LeMon&Oracle? What is T2s man-power?• RedEye? What is T2s man-power?• Real collaboration is far from mailing list

and phone conferences only