r4 - 24 Mar 2011 - 12:47:47 - SaulYoussefYou are here: TWiki >  Admins Web > MinutesMar23

MinutesMar23

Introduction

Minutes of the Facilities Integration Program meeting, March 23, 2011
  • Previous meetings and background : IntegrationProgram
  • Coordinates: Wednesdays, 1:00pm Eastern
    • 866-740-1260, Access code: 7027475

Audio Details: Dial-in Number:
U.S. & Canada: 866.740.1260
U.S. Toll: 303.248.0285
Access Code: 7027475; Chair passcode: 8734
Registration Link: https://cc.readytalk.com/r/bd2w3deu2kkg

Attending

  • Meeting attendees: Charles, Aaron, Shawn, Nate, Rob, John, Jason, Karthik, Sarah, Patrick, Wei, Horst, Saul, Bob, Mark, Armen, Alden, Kaushik, Torre, Tom, Hiro
  • Apologies: Doug, AK

Integration program update (Rob, Michael)

  • IntegrationPhase16 NEW
  • Special meetings
    • Tuesday (12 noon CDT) : Data management
    • Tuesday (2pm CDT): Throughput meetings
  • Upcoming related meetings:
  • Program notes:
    • last week(s)
      • WLCG reporting - still to sort out - Karthik reporting. See https://twiki.grid.iu.edu/bin/view/Accounting/OSGtoWLCGDataFlow. Problems using KSI2K? factor, on the OSG side - is the table incorrect? Also problems with HT on or off.
      • Capacity spreadsheet reporting - see updates with HT and number of jobs per node.
      • ATLAS ADC is in the process checking capacities - a new web page provided DDM, via SRM; browsing the page found the deployed capacities are underreporting for every site. We need to understand why. Eg. AGLT2 (1.9 PB versus 1.4 PB reported). We need to take a look into this. Michael will provide link. SWT2 - may be related to the space token reporting.
      • Expected capacity to deliver - may need to average out to meet the pledges between T1 and T2's.
      • LHC first collisions on Sunday, stable beams are still rare - working on protections, loss maps.
      • http://bourricot.cern.ch/dq2/accounting/federation_reports/USASITES/
    • this week
      • WLCG usage accounting reporting needs to be fixed, and the VO share to be provided to WLCG. Along to capacity reporting.
      • WLCG MB is looking at capacity provisioning in terms of the 2011 pledges - and we are about 1 PB short.
      • There is a list of technical R & D issues as discussed in Napoli; there a twik list of activities. Summary from Torre: will need to start organizing and meeting around them quickly. In contxt of ADC re-org. Cloud, fed xrootd, no-mysql among topics. Proceeding towards production for some, others will require taskforces. Alexei - sent around a list, ought be finalized quickly. Next step will be to take from ATLAS to CERN IT, and to extend to CMS and other experiments. First step in wider collaboration.
      • Machine ramping up nicely, anticipate analysis will follow and challenges for pileup, etc. In view of this the capacities need to be up, and stable,

Tier 3 Integration Program (Doug Benjamin)

Tier 3 References:
  • The link to ATLAS T3 working groups Twikis are here
  • T3g Setup guide is here
  • Users' guide to T3g is here

last week(s):

  • Doug travels to Arizona next week (Tues-Thursday) to help setup their Tier 3 site
  • last week had a meeting during the OSG Hands meeting with VDT about Xrootd rpm packaging. OSG/VDT promised a new rpm soon.
    • Next week - Wei reports a new release is imminent.
  • CVMFS meeting Wednesday 16-Mar 17:00 CET
    • Move to final namespace in advance migration to CERN IT - not sure about timescale
    • Nightlies and conditions data
    • AGLT2 discovered a problem with fresh installation - testing a different machine. Should be fixed so as to not damage the file system.
  • Write up on Xrootd federation given to Simone Campana and Torre Wenaus. They are collecting information on R&D tasks and task forces
  • wlcg-client - now supported by Charles; some python issues need to be resolved.
  • UTD report from Joe - cmtconfig error - was running CentOS, tracked down to firmware updater from redhat needs. Lost heartbeat errors - tracked down
this week:

Operations overview: Production and Analysis (Kaushik)

Data Management and Storage Validation (Armen)

  • Reference
  • last week(s):
    • No meetings this week
    • Deletion from GROUPDISK - taking some time - all deletions will be submitted by tomorrow.
    • Discussions with developers of deletion tools, lots of mail exchange. There is a large backlog of deletions.
    • Otherwise the space is okay.
    • Discuss LOCALGROUPDISK in Tuesday meeting - how to manage it. (A US facility clean up disk) Need some accounting and deletion policy.
    • Shawn notes that some ACLs may need to be changed in the LFC.
    • Will do a test SWT2 today.
  • this week:
    • MinutesDataManageMar22
    • Storage monitoring problem fixed.
    • Storage reporting categories - unallocated (non-SRM) and unpowered (on floor, but not connected).
    • Deletion - userdisk on the way. Issues with central deletion (old issue) being followed up.
    • LFC ghost category rising (Charles)
    • Old groupdisk issue - all data is now cleaned up.
    • localgroupdisk cleaning and monitoring - accounting.
    • New proddisk cleanup utility sent by Charles
    • Hiro will work on a page of stacked plots of each site. Will need to work with ADC to show augmenting of the storage in the DQ2 accounting.
    • Discussion about localgroupdisk policy. Wei notes we don't have balance as to how much to allocate there. Michael notes localgroupdisk does not count against pledge. Tendency is to merge tokens.

Shifters report (Mark)

  • Reference
  • last meeting: Operations summary:
    Yuri's summary from the weekly ADCoS meeting:
    http://indico.cern.ch/getFile.py/access?contribId=1&resId=0&materialId=0&confId=131286
    
    1)  3/10: SLACXRD_LOCALGROUPDISK transfer errors ("failed to contact on remote SRM [httpg://osgserv04.slac.stanford.edu:8443/srm/v2/server]").  From Wei: We are hit very 
    hard by analysis jobs. Unless that is over, I expect error like this to continue.  As of 3/14 issue probably resolved - we can close ggus 68498.  eLog 22978.
    2)  3/12: SLACXRD_LOCALGROUPDISK transfer errors with "[NO_SPACE_LEFT] No space found with at least .... bytes of unusedSize]."  
    https://savannah.cern.ch/bugs/index.php?79353 still open, eLog 23037.  Later the same day: SLACXRD_PERF-JETS transfer failures with "Source file/user checksum mismatch" errors.  
    https://savannah.cern.ch/bugs/index.php?79361.  Latest comment to the Savannah ticket suggests declaring the files lost to DQ2 if they are corrupted.  eLog 23048.
    3)  3/12: UTD-HEP set on-line.  http://savannah.cern.ch/support/?119596, eLog 23057.  (The site had originally been set on-line back on 3/5, but ran into some cmtconfig issues.  
    These were resolved as of 3/12, and test jobs were successful.)
    4)  3/12: OU_OCHEP_SWT2_DATADISK - file transfer errors like "gridftp_copy_wait: Connection timed out."  From Horst: Since these timeouts only happened from two sites, while 
    we've been getting lots of successful transfers from everywhere else at the same time and still are, I'm going to assume the problem is on the other end(s) and am closing this ticket again.  
    ggus 68570 / RT 19558 closed, eLog 23059.
    5)  3/13: Shifter reported that some queries in the panda monitor requesting detailed job information were returning errors.  Valeri reported that a fix to the problem had been deployed.  
    https://savannah.cern.ch/bugs/index.php?79367, eLog 23064.
    6)  3/13: OU_OSCER_ATLAS job failures due to a problem with release 15.6.3.10.  As of 3/14 Alessandro was reinstalling the s/w.  Can we close this ticket?  ggus 68611 / RT 19561, 
    eLog 23134, https://savannah.cern.ch/bugs/index.php?79368.
    7)  3/14: SWT2_CPB - power outage in the building, the generator came on, but was not supplying power correctly to the A/C units in the machine room.  Entire cluster had to be powered off.  
    Power restored to the building by early evening - systems were gradually brought back on-line.  As of 3/15 afternoon test jobs completed successfully, panda queues back on-line.  eLog 23189.
    8)  3/14: MWT2_UC file transfer errors ("[GENERAL_FAILURE] AsyncWait] Duration [0]").  From Aaron: This is due to a dcache pool which has been restarted multiple times this afternoon. 
    We are attempting to get this server more stable or drain it, and we expect to be running again without problems within an hour or two.  Can we close this ticket?  ggus 68617, eLog 23139.
    9)  3/15: Development version of the panda monitor available for testing (http://pandadev.cern.ch/).  This version is being tested under SLC5.
    10)  3/15: HU_ATLAS_Tier2 and ANALY_HU_ATLAS_Tier2 set off-line at Saul's request.  ggus 68660, https://savannah.cern.ch/support/index.php?119796, eLog 23194.
    
    Follow-ups from earlier reports:
    
    (i)  1/9: AGLT2 - low-level of job failures with the error "Put error: lfc_creatg failed with (2704, Bad magic number)."  Site is investigating.
    (ii)  1/19: BNL - user reported a problem while attempting to download files from the site - for example: "httpg://dcsrm.usatlas.bnl.gov:8443/srm/managerv2: CGSI-gSOAP running on t301.hep.tau.ac.il reports 
    Error reading token data header: Connection closed."  ggus 66298.  From Hiro:
    There is a known issue for users with Israel CA having problem accessing BNL and MWT2. This is actively investigated right now. Until this get completely resolved, users are suggested to request 
    DaTRI request to transfer datasets to some other sites (LOCAGROUPDISK area) for the downloading.
    Update 3/14 from Iris: The issue is still under investigation. Thank you for your patience.
    (iii)  2/10: A bug in the most recent OSG software release (1.2.17, released on Monday, February 7th) affects WLCG availability reporting for sites. Sites may go into an UNKNOWN state one day after updating.  
    Thus it is recommended that sites defer upgrading their OSG installations until a fix is released.  See: http://osggoc.blogspot.com/
    (iv)  2/24: MWT2_UC - job failures with " lsm-get failed: time out after 5400 seconds" errors.  From Aaron: We performed a dcache upgrade yesterday, 3/1 which has improved our stability at the moment. 
    This can probably be closed, as new tickets will be opened if new failures occur.  ggus 67887 in-progress (and will be closed), eLog 22425.
    Update 3/11: this issue cross-linked to the (closed) ggus ticket 68544.
    Update 3/14 from Aaron: No errors have occurred like this recently. Closing, please re-open or open a new ticket if the problem continues.  Both ggus tickets now closed/solved.  eLog 22984, 23017.
    
  • this meeting:* Operations summary:
    Yuri's summary from the weekly ADCoS meeting:
    https://indico.cern.ch/getFile.py/access?contribId=0&resId=0&materialId=0&confId=132241
    
    1)  3/16: AGLT2 - Issue with dCache file server resolved.  Files on the machine were inaccessible for a couple of hours while a firmware upgrade was performed.
    2)  3/18 - 3/21: SWT2_CPB - FT and SRM errors ("failed to contact on remote SRM [httpg://gk03.atlas-swt2.org:8443/srm/v2/server]").  Issue was a problem NIC 
    in one of the storage servers which took the machine off the network, resulting in the SRM errors.  Resolved as of 3/21.  RT 19593 / ggus 68782 closed, eLog 23381/481.
    3)  3/18: SWT2_CPB - unrelated issue to 2) above, although the tickets were getting mixed up, job failures with the error "transformation not installed in CE (16.0.3.4)."  
    Xin successfully re-ran the validation for this cache, so not clear what the issue is.  Closed ggus 68740 / RT 19587 as "unsolved," eLog 23488.
    4)  3/19: SLACXRD - large backlog of transferring jobs - issue understood, FTS channels had not been  re-opened after adjusting bestman.  ggus 68783 closed, eLog 23350.
    5)  3/19: Some inconsistencies in the panda monitor were reported (for example number of running jobs).  Resolved - https://savannah.cern.ch/bugs/index.php?79654, eLog 23370.
    6)  3/21: SLACXRD_DATADISK file transfer errors (" failed to contact on remote SRM [httpg://osgserv04.slac.stanford.edu:8443/srm/v2/server]").  Issue resolved, ggus 68804 
    closed, eLog 23447.
    7)  3/21: OU_OCHEP_SWT2 - maintenance outage in order to move the cluster.  Work completed as of ~6:00 p.m. CST.  Test jobs successful, site set back on-line.  eLog 23514.
    8)  3/22 - 3/23: Jobs from several heavy ion tasks were failing in the U.S. cloud (and others) with the error "No child processes."  Paul suspects this may be due to the fact 
    that the pilot has to send a large field containing output file info in the TCP message, and this overloads the TCP server on the WN used by the pilot.  If this is the case a fix will 
    be implemented.  See: https://savannah.cern.ch/bugs/?79915, eLog 23555.
    
    Follow-ups from earlier reports:
    
    (i)  1/9: AGLT2 - low-level of job failures with the error "Put error: lfc_creatg failed with (2704, Bad magic number)."  Site is investigating.
    (ii)  1/19: BNL - user reported a problem while attempting to download files from the site - for example: "httpg://dcsrm.usatlas.bnl.gov:8443/srm/managerv2: CGSI-gSOAP running 
    on t301.hep.tau.ac.il reports Error reading token data header: Connection closed."  ggus 66298.  From Hiro:
    There is a known issue for users with Israel CA having problem accessing BNL and MWT2. This is actively investigated right now. Until this get completely resolved, users are suggested 
    to request DaTRI request to transfer datasets to some other sites (LOCAGROUPDISK area) for the downloading.
    Update 3/14 from Iris: The issue is still under investigation. Thank you for your patience.
    (iii)  2/10: A bug in the most recent OSG software release (1.2.17, released on Monday, February 7th) affects WLCG availability reporting for sites. Sites may go into an UNKNOWN 
    state one day after updating.  Thus it is recommended that sites defer upgrading their OSG installations until a fix is released.  See: http://osggoc.blogspot.com/
    (iv)  3/10: SLACXRD_LOCALGROUPDISK transfer errors ("failed to contact on remote SRM [httpg://osgserv04.slac.stanford.edu:8443/srm/v2/server]").  From Wei: We are hit very 
    hard by analysis jobs. Unless that is over, I expect error like this to continue.  As of 3/14 issue probably resolved - we can close ggus 68498.  eLog 22978.
    Update 3/20: ggus 68498 closed,
    (v)  3/12: SLACXRD_LOCALGROUPDISK transfer errors with "[NO_SPACE_LEFT] No space found with at least .... bytes of unusedSize]."  https://savannah.cern.ch/bugs/index.php?79353 
    still open, eLog 23037.  Later the same day: SLACXRD_PERF-JETS transfer failures with "Source file/user checksum mismatch" errors.  https://savannah.cern.ch/bugs/index.php?79361.  
    Latest comment to the Savannah ticket suggests declaring the files lost to DQ2 if they are corrupted.  eLog 23048.
    Update 3/21: Savannah 79353 closed (free space is available).
    (vi)  3/13: OU_OSCER_ATLAS job failures due to a problem with release 15.6.3.10.  As of 3/14 Alessandro was reinstalling the s/w.  Can we close this ticket?  ggus 68611 / RT 19561, 
    eLog 23134, https://savannah.cern.ch/bugs/index.php?79368.
    (vii)  3/14: MWT2_UC file transfer errors ("[GENERAL_FAILURE] AsyncWait] Duration [0]").  From Aaron: This is due to a dcache pool which has been restarted multiple times this afternoon. 
    We are attempting to get this server more stable or drain it, and we expect to be running again without problems within an hour or two.  Can we close this ticket?  ggus 68617, eLog 23139.
    Update 3/16: ggus 68617 closed.
    (iix)  3/15: HU_ATLAS_Tier2 and ANALY_HU_ATLAS_Tier2 set off-line at Saul's request.  ggus 68660, https://savannah.cern.ch/support/index.php?119796, eLog 23194.
    Update 3/16: Some CRL's updated (jobs had been failing with "bad credentials" errors) - test jobs successful, queues set back on-line.  ggus 68660 closed.
    
    • HI reprocessing job failures at NET2 - "no child process" reported by pilot. Paul involved - large amount of info to be sent by pilot, developing work around.

DDM Operations (Hiro)

Throughput and Networking (Shawn)

  • NetworkMonitoring
  • https://www.usatlas.bnl.gov/dq2/throughput
  • Now there is FTS logging to the DQ2 log page at: http://www.usatlas.bnl.gov/dq2log/dq2log (type in 'fts' and 'id' in the box and search).
  • last week:
    • Action item all T2's to get another load test in. Sites to contact Hiro, monitor the results. An hour long test. ASAP.
    • Throughput meeting:
         USATLAS Throughput Meeting Notes --- March 15, 2011
                      ===========================================
      Attending: Shawn, Andy, Dave, Philippe, Sarah, Jason, Aaron, Tom, John
       
      1)      Past Action Item status
      a.       Dell R410 (merged perfSONAR box):  No updates.
      b.      AGLT2 to MWT2_IU (low throughput noted, used NLR segment unlike most other MWT2_IU paths).   No updates on this issue.   Jason had done some NLR tests.  Will be looking later this more later this week.
      c.       Loadtest retesting.   Sites need to schedule tests.  Contact Hiro.  Only AGLT2 done so far.  Tier-2 sites should try to schedule loadtests before the next meeting in two weeks. (Avoid conflicts with LHC data by getting this done soon).
      2)      perfSONAR status -  Currently 3 CRIT values on Latency matrix for LHCPERFMON.  Andy will check the plugin to see if CRIT may mean “UNKNOWN”.   General discussion about current settings and email alerting.  Jason mentioned restarting services may cause problems with the low-level service monitoring.   Jason will check for possible fixes to handle restarts.  Tom can setup alerting windows which ignore known bad periods or can use different criteria (e.g., need to fail two tests 1 hour apart before alerting).  General consensus was to keep things as they are to get more experience and make sure things are stable.  Will revisit more aggressive alerting and threshold tuning in a future meeting.
      3)      Throughput monitoring
      a.       Hiro’s throughputs still have MCDISK…fix?  -  No update.
      b.      Adding perfSONAR to throughput test graphs –No update.
      c.       Tom described transition to remove dependency of perfSONAR dashboard on Nagios.  Jason is providing Andy’s plugins augmented with “RSV” mode.   Goal is to have RSV tests for perfSONAR feeding Gratia DB.  Tom’s dashboard (currently PHP) will migrate to Java and utilize the Gratia DB as it’s source.  Modular and portable for the future.
      d.      Shawn described ‘ktune’ package for USATLAS sites.  Started from ktune 0.2-6 and augmented with some tuning’s from AGLT2 and others.  Network recommendations taken from ESnet’s Fasterdata page at http://fasterdata.es.net/   Asking for “beta” testers to deploy and provide feedback.  RPMS available at:
    • http://linat05.grid.umich.edu/ktune-0.2-6_usatlas.src.rpm
    • http://linat05.grid.umich.edu/ktune-0.2-6_usatlas.noarch.rpm (This is the one you install to test…read the README)
      4)      Site Reports/Around-the-table:  Aaron noted MWT2_IU -> OU performance is bad.   On the list of things to check.   Will be looked at soon.   Shawn mentioned ‘ktune’ again…looking for sites longer term to help benchmark settings and augment package to provide a starting point for sites to use.
       
      No AOB.  Plan to keep in touch on on-going activities via email.   We will meet again in two weeks at the regular time.  Send along corrections or additions to the notes via email.  Thanks,
       
      Shawn 
    • Matrices are mostly green DONE
    • Will turn up the sensitivity - will watch for alerts.
    • Modularizing perfsonar for OSG RSV probes - store in a Gratia database.
    • ktune - come up with recommended kernel tunings, appropriate for wide area networking. Aaron and Dave doing some testing. Tunes TCP stack, may tune the NIC via ethtool command, does some memory settings.
    • Site certification table for this quarter has load tests. 400 MB/s over an hour, or best as can. Capture plots.
  • this week:
    • Reminder to complete load testing, and update site certification table SiteCertificationP16
    • still working on ktune for tuning the kernal - issue as to which parameters to use for server-kernel settings. Shawn to provide information and pointers.
    • perfsonar integrated into RSV
    • meeting next Tuesday
    • Remind sites to get load tests finished. MWT2, UIUC, AGLT2 have completed this, and document on site certification table.

Federated Xrootd at sites: Tier 3 (Doug), Tier 2 (Charles)

last week(s):
  • Doug sent a document to Simone and Torre - to be part of an ATLAS task force, R & D project, may be discussed during SW week.
  • Charles - continuing to test - performance tests 500 MB/s. Post LFC model work - to replace the LFC-callout plugin (requires normalizing paths; getting rid of DQ2 suffixes - some setting changed).
this week:
  • Stil working on no-LFC mode functional - some progress on that.
  • Investigating client-side modifications for "libdcap++"
  • Performance tests continuing
  • Will standardize on xrootd rpm release
  • Version 3.0.3 is working fine at the moment.

Site news and issues (all sites)

  • T1:
    • last week(s): BNL has its own PRODDISK area now. Deployed about 2PB of disk, in production. Will need to remove some of the storage.
    • this week: SRM database hiccup, investigating. Procurement for 150 westmere-based nodes, R410 with X5660, in advanced state. Pledge plus 20%. Looking at storage management soln on lower level (http://www.nexenta.org/, alternative to Solaris/ZFS). Close to getting another 10G wide area circuit through ESnet - will see how to use it; possibly to connect to LHCONE open access point.

  • AGLT2:
    • last week(s): All is working well. Have had some checksum failures - chasing this down. Users attempting to get files that were once here, but no longer. Is the user job unknowingly removed files under the usatlas1 account? Looking at options to trap the remove command, and log these. Want to get the lsm installed here, to instrument IO. Doing some work on the SE. Would like to get better aspects of IO for jobs. Testing on ktune.
    • this week: Below April 1 in space tokens - will bring on two servers into production. Monitoring page updated showing storage in different categories. Working on firmware updates. Working on ktune, checking settings. Nexan evaluation to fiber channel storage w/ SATABEAST, connect to Dell headnode. Will spend a week testing and integration.

  • NET2:
    • last week(s): Work at BU storage - all underway to improve transfers to HU. Two GPFS filesystems will be combined (will change reporting momentarily). New switch for HU connectivity. Production job failures at HU last night - expired CRL - stopped running for some reason.
    • this week: Tier 3 has arrived and is being tested and setup, along with new 10G switch - which also will be used for analysis at Harvard. Changing GPFS filesystem, as before. One or more 10G links to add to NOX. Planning big move to Holyoke in 2012. Procurement of additional storage at BU side.

  • MWT2:
    • last week(s): Working on a new MWT2 endpoint using Condor as a scheduler. Correct CPUs arrived from Dell - to be replaced.
    • this week: Preparing major move of MWT2 to new server room. CPU replacement at IU.

  • SWT2 (UTA):
    • last week: Lost power on campus Monday afternoon - problem in switch gear for cooling.
    • this week: Storage server failed over weekend, recovered on Monday. Working with Alessandro on using his installation method. Working with Armen to get USERDISK deletions working at the site.

  • SWT2 (OU):
    • last week: Waiting for final confirmation for compute node additions next week. Investigating Alessandro's install job hang.
    • this week: Moved cluster Monday afternoon, ready for Dell to install the nodes, scheduled for Monday.

  • WT2:
    • last week(s): Last week problem with a Dell machine storage - replaced CPU and memory, though not stressed. Planning 3 major outages - each lasting a day or two: March, April, early May. Will be setting final dates soon. Getting quote for new switch.
    • this week: Channel bonding for Dell 8024F uplinks; need to update firmware. Will have storage outtage this afternoon. Shawn reports having done this successfully with latest firmware.

Carryover issues ( any updates?)

Release installation, validation (Xin)

The issue of validating process, completeness of releases on sites, etc. Note: https://atlas-install.roma1.infn.it/atlas_install/ - site admins can subscribe, and get notified of release installation & validation activity at their site.

  • last report(s)
    • IU and BU have now migrated.
    • 3 sites left: WT2, SWT2-UTA, HU
    • Waiting on confirmation from Alessandro; have requested completion by March 1.
    • Focusing on WT2 - there is a proxy issue
    • No new jobs yet to: SWT2, HU - jobs are timing out, not running.
    • There is also Tufts. BDII publishing.
    • One of the problems at SLAC is lack of outbound links, and the new procedure will probably use gridftp. Discussing options with them.
  • this meeting:
    • WT2- waiting for a queue with outbound connections - Wei has submitted
    • HU - Saul will check (Harvard is working in the new system S.Y.)

AOB

  • last week
  • this week
    • Joe Izen - UTD: smooth week of running; will be taking a short outtage. Production side all is well. Tier 3 work progress.


-- RobertGardner - 23 Mar 2011

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