Difference between revisions of "Tier1 Operations Report 2017-07-05"

Revision as of 10:42, 5 July 2017

Review of Issues during the week 28th June to 5th July 2017.

There have been some intermittent problems accessing the Atlas Scratch Disk. We received a GGUS ticket from Atlas but the problem had resolved itself beforehand. However, it has also recurred. At present the cause is unknown.
There were problems with xroot redirection for CMS last Thursday to Friday. The usual fix - restarting the services - didn't work. A full disk area on one of the nodes was found to be the cause.
Castor Gen instance has been failing OPS SRM tests since Friday (30th June). This appears to be because we the tests have started trying to access an area that was decommissioned around a year ago.
I have not been reporting data loss incidents in this report. To pick this back up for the last week:
- Following draining of disk servers we reported:
  - When GDSS648 was drained one file was lost from LHCbUser.
  - When GDSS694 was drained two files were lost for CMS
- One corrupted file from CMSDisk reported from GDSS801. File appears to have written correctly but later read failed owing to corruption.

Resolved Disk Server Issues

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. CMS are also looking at file access performance and have turned off "lazy-download". The CMS SRM SAM test success rate has improved since the Castor 2.1.16 upgrade on the 25th May, although is still not 100%. It is still planned to re-visit this issue now Castor has been upgraded.
There is a problem on the site firewall which is causing problems for some specific data flows. This was being investigated in connection with videoconferencing problems. It is expected that this is having an effect on our data that flows through the firewall (such as to/from worker nodes).

Ongoing Disk Server Issues

Limits on concurrent batch system jobs.

Notable Changes made since the last meeting.

The number of placement groups in the Echo CEPH Atlas pool is being steadily increased. This is in preparation for the increase in storage capacity when new hardware is added.

Declared in the GOC DB

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:

Firmware updates in OCF 14 disk servers.
Upgrade the FTS3 service to a version that will no longer support the SOAP interface.
Increase the number of placement groups in the Atlas Echo CEPH pool.

Listing by category:

Castor:
- Move to generic Castor headnodes.
- Merge AtlasScratchDisk into larger Atlas disk pool.
Echo:
- Increase the number of placement groups in the Atlas Echo CEPH pool.
Networking
- Enable first services on production network with IPv6 now that the addressing scheme has been agreed. (Perfsonar already working over IPv6).
Services
- The production FTS needs updating. This will no longer support the SOAP interface. (The "test" FTS , used by Atlas, has already been upgraded.)

Entries in GOC DB starting since the last report.

Open GGUS Tickets (Snapshot during morning of meeting)


GGUS ID	Level	Urgency	State	Creation	Last Update	VO	Subject
129342	Green	Urgent	Assigned to someone else	2017-07-04	2017-07-04		[Rod Dashboard] Issue detected : org.sam.SRM-Put-ops@srm-mice.gridpp.rl.ac.uk
129299	Green	Urgent	In Progress	2017-06-30	2017-07-03	CMS	bad data was encountered errors in some transfers from RAL
129228	Green	Urgent	Waiting for Reply	2017-06-28	2017-06-30	CMS	Low HC xrootd success rates at T1_UK_RAL
129211	Green	Urgent	In Progress	2017-06-27	2017-06-29	Atlas	FR TOKYO-LCG2: DDM transfer errors with "A system call failed: Connection refused"
129098	Green	Urgent	In Progress	2017-06-22	2017-06-27	Atlas	RAL-LCG2: source / destination file transfer errors ("Connection timed out")
129059	Green	Very Urgent	Waiting for Reply	2017-06-20	2017-06-28	LHCb	Timeouts on RAL Storage
128991	Green	Less Urgent	In Progress	2017-06-16	2017-06-16	Solid	solidexperiment.org CASTOR tape support
127597	Red	Urgent	On Hold	2017-04-07	2017-06-14	CMS	Check networking and xrootd RAL-CERN performance
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	2017-05-10		CASTOR at RAL not publishing GLUE 2.

Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 845); Atlas HC Echo = Atlas Echo (Template 841);CMS HC = CMS HammerCloud


Day	OPS	Alice	Atlas	CMS	LHCb	Atlas Echo	Atlas HC	Atlas HC Echo	CMS HC	Comment
28/06/17	100	100	100	99	100	100	100	100	100	Single SRM test failure with User Timeout.
29/06/17	100	100	98	100	100	100	99	100	100	Single SRM test failure '[SRM_FAILURE] Unable to receive header’.
30/06/17	100	100	100	100	100	100	96	100	100
01/07/17	100	100	100	99	100	100	100	100	100	Single SRM test failure with User Timeout.
02/07/17	100	100	100	100	100	100	100	100	100
03/07/17	100	100	100	100	100	100	100	98	100
04/07/17	100	100	100	97	100	100	100	100	92	Two SRM test failures and a brief set of failures of Job submission tests.

Notes from Meeting.

@@ Line 17: / Line 17: @@
 *** When GDSS648 was drained one file was lost from LHCbUser.
 *** When GDSS694 was drained two files were lost for CMS
-** One corrupted file from CMSDisk reported from GDSS801. File appears to have written correctly but later reda failed owing to corruption.
+** One corrupted file from CMSDisk reported from GDSS801. File appears to have written correctly but later read failed owing to corruption.
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