Difference between revisions of "Tier1 Operations Report 2017-02-22"

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| style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Review of Issues during the week 15th to 22nd February 2017.
 
| style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Review of Issues during the week 15th to 22nd February 2017.
 
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* Since the castor upgrade we have seen a couple of further problems which are now mainly fixed:
+
* There was a file access problem seen by LHCb last night. This appears to have been a temporary problem (thread starvation within the SRM) that went away this morning.
−
** Two VOs, Atlas and LHCb have seen issues with database resources (number of cursors). The latest being Atlas on Friday 10th. We still don't understand this.
+
* There remains some issues following the Castor 2.1.15 upgrade -
−
** We had been failing tests for CMS xroot. This was fixed by changing the weighting for xrootd in the Castor transfermanagerd.
+
** An occasional problem with a database resource (number of cursors) becoming  exhausted. This has affected more than one of the instances. Investigations into this are ongoing. There is a bugfix to Castor in version 2.1.16 in this area.
−
** We had being failing CMS tests for an SRM endpoint defined in the GOC DB but not in production ("srm-cms-disk"). This SRM endpoint was removed from the GOCDB but then we started failing SAM tests for the remaining CMS SRM endpoint. Eventually the problem was tracked down to a bug in the test. CMS fixed it and now we are back to our 'normal' level of SRM test failures.
+
** We are managing memory leaks seen in the transfer manager component.
−
* There was an issue with a network switch connecting some of the ECHO (CEPH) headnodes to the network on Friday (10th Feb). It was resolved when the switch's link was restarted on Tuesday morning.
+
** We still see some timeout test failures in SAM tests for CMS.
 
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| style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Current operational status and issues
 
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* We are still seeing a rate of failures of the CMS SAM tests against the SRM. These are affecting our (CMS) availabilities but the level of failure have been reduced recently.
+
* We are still seeing a rate of failures of the CMS SAM tests against the SRM. These are affecting our (CMS) availabilities but the level of failures have been reduced recently.
 
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 +
====== ======
 +
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|-
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| style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Limits on concurrent batch system jobs.
 +
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 +
* LHCb Pilot 4500
 +
* Atlas Pilot (Analysis) 1600
 +
* CMS Multicore 470
 +
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| style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Notable Changes made since the last meeting.
 
| style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Notable Changes made since the last meeting.
 
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* The ECHO (CEPH) instance was upgraded yesterday (Tuesday 14th) to kraken.  
+
* The OPNR (OPN router) has been enabled for IPv6 this morning. A reboot was required to enable IPv6 ACLS.
 +
* Various systems have had security and other patches applied. In particular back end database systems are being updated to remove a software layer ("asmlib").
 +
* Two batches of worker nodes are running SL7 with the jobs themselves in SL6 containers.
 
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! GGUS ID !! Level !! Urgency !! State !! Creation !! Last Update !! VO !! Subject
 
! GGUS ID !! Level !! Urgency !! State !! Creation !! Last Update !! VO !! Subject
 
|-
 
|-
−
| 126533
+
| 1267
 +
| Green
 +
| Very Urgent
 +
| In Progress
 +
| 2017-02-22
 +
| 2017-02-22
 +
| LHCb
 +
| File access problem at RAL
 +
|-
 +
| 126718
 
| Green
 
| Green
 
| Urgent
 
| Urgent
 
| In Progress
 
| In Progress
−
| 2017-02-10
+
| 2017-02-21
−
| 2017-02-14
+
| 2017-02-21
 
| Atlas
 
| Atlas
−
| UK RAL-LCG2-ECHO transfer/staging/deletion failures with "Unable to connect to gridftp.echo.stfc.ac.uk"
+
| UK RAL-LCG2-ECHO DATADISK: ~8k deletion error due to "Device or resource busy"
 
|-
 
|-
 
| 126532
 
| 126532
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| In Progress
 
| In Progress
 
| 2017-02-09
 
| 2017-02-09
−
| 2017-02-10
+
| 2017-02-21
 
| Atlas
 
| Atlas
 
| RAL tape staging errors
 
| RAL tape staging errors
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| On Hold
 
| On Hold
 
| 2015-11-18
 
| 2015-11-18
−
| 2016-12-07
+
| 2017-02-10
 
|  
 
|  
 
| CASTOR at RAL not publishing GLUE 2. Looking at it again now (Feb), progress made on back end. Need to update ticket.
 
| CASTOR at RAL not publishing GLUE 2. Looking at it again now (Feb), progress made on back end. Need to update ticket.
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−
* None yet
+
* CMS confirmed their xroot redirection tests are passing OK for RAL Castor.
 +
* Catalin has carried out a survey of the users of the WMS service. This indicates ongoing interest in this service.
 +
* Dirac VO site Edinburgh has made more test transfers. A problem with access to the Catsor webdav interface for Dirac has been resolved.

Latest revision as of 14:24, 22 February 2017

RAL Tier1 Operations Report for 22nd February 2017

Review of Issues during the week 15th to 22nd February 2017.
  • There was a file access problem seen by LHCb last night. This appears to have been a temporary problem (thread starvation within the SRM) that went away this morning.
  • There remains some issues following the Castor 2.1.15 upgrade -
    • An occasional problem with a database resource (number of cursors) becoming exhausted. This has affected more than one of the instances. Investigations into this are ongoing. There is a bugfix to Castor in version 2.1.16 in this area.
    • We are managing memory leaks seen in the transfer manager component.
    • We still see some timeout test failures in SAM tests for CMS.
Resolved Disk Server Issues
  • None
Current operational status and issues
  • We are still seeing a rate of failures of the CMS SAM tests against the SRM. These are affecting our (CMS) availabilities but the level of failures have been reduced recently.
Ongoing Disk Server Issues
  • GDSS663 (AtlasTape - D0T1) crashed on Saturday (18th Feb). Two faulty disks found and replaced. Expected back in service imminently.
Limits on concurrent batch system jobs.
  • LHCb Pilot 4500
  • Atlas Pilot (Analysis) 1600
  • CMS Multicore 470
Notable Changes made since the last meeting.
  • The OPNR (OPN router) has been enabled for IPv6 this morning. A reboot was required to enable IPv6 ACLS.
  • Various systems have had security and other patches applied. In particular back end database systems are being updated to remove a software layer ("asmlib").
  • Two batches of worker nodes are running SL7 with the jobs themselves in SL6 containers.
Declared in the GOC DB
Service Scheduled? Outage/At Risk Start End Duration Reason
Whole site SCHEDULED WARNING 01/03/2017 07:00 01/03/2017 11:00 4 hours Warning on site during network intervention in preparation for IPv6.
Advanced warning for other interventions
The following items are being discussed and are still to be formally scheduled and announced.

Pending - but not yet formally announced:

  • Merge AtlasScratchDisk into larger Atlas disk pool.

Listing by category:

  • Castor:
    • Update SRMs to new version, including updating to SL6. This will be done after the Castor 2.1.15 update.
  • Networking:
    • Enabling IPv6 onto production network.
  • Databases
    • Removal of "asmlib" layer on Oracle database nodes.
Entries in GOC DB starting since the last report.
Service Scheduled? Outage/At Risk Start End Duration Reason
lfc.gridpp.rl.ac.uk SCHEDULED WARNING 22/02/2017 08:45 22/02/2017 13:00 4 hours and 15 minutes LFC Oracle backend security updates
All Castor and ECHO storage and Perfsonar. SCHEDULED WARNING 22/02/2017 07:00 22/02/2017 11:00 4 hours Warning on Storage and Perfsonar during network intervention in preparation for IPv6.
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
1267 Green Very Urgent In Progress 2017-02-22 2017-02-22 LHCb File access problem at RAL
126718 Green Urgent In Progress 2017-02-21 2017-02-21 Atlas UK RAL-LCG2-ECHO DATADISK: ~8k deletion error due to "Device or resource busy"
126532 Green Urgent In Progress 2017-02-09 2017-02-21 Atlas RAL tape staging errors
126184 Green Less Urgent In Progress 2017-01-26 2017-02-07 Atlas Request of inputs for new sites monitoring
124876 Red Less Urgent On Hold 2016-11-07 2017-01-01 OPS [Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
117683 Red Less Urgent On Hold 2015-11-18 2017-02-10 CASTOR at RAL not publishing GLUE 2. Looking at it again now (Feb), progress made on back end. Need to update ticket.
Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 845); Atlas HC ECHO = Atlas ECHO (Template 842);CMS HC = CMS HammerCloud

Day OPS Alice Atlas CMS LHCb Atlas HC Atlas HC ECHO CMS HC Comment
15/02/17 100 100 100 96 100 99 100 100 Timeouts on CMS SRM tests.
16/02/17 100 100 100 92 100 100 100 100 Timeouts on CMS SRM tests.
17/02/17 100 100 100 88 100 100 99 100 Timeouts on CMS SRM tests.
18/02/17 100 100 100 97 100 100 96 100 Timeouts on CMS SRM tests.
19/02/17 100 100 100 97 100 100 99 100 Timeouts on CMS SRM tests.
20/02/17 100 100 100 96 100 98 97 100 Timeouts on CMS SRM tests.
21/02/17 100 100 100 98 100 98 93 100 Timeouts on CMS SRM tests.
Notes from Meeting.
  • CMS confirmed their xroot redirection tests are passing OK for RAL Castor.
  • Catalin has carried out a survey of the users of the WMS service. This indicates ongoing interest in this service.
  • Dirac VO site Edinburgh has made more test transfers. A problem with access to the Catsor webdav interface for Dirac has been resolved.
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