Difference between revisions of "Tier1 Operations Report 2016-07-20"

Revision as of 12:05, 20 July 2016

Review of Issues during the week 13th to 20th July 2016.

There has been saturation of the inbound 10Gbit OPN link at times over the last week. The bypass route to JANET has also shown high traffic volumes.

Resolved Disk Server Issues

Current operational status and issues

There is a problem seen by LHCb of a low but persistent rate of failure when copying the results of batch jobs to Castor. There is also a further problem that sometimes occurs when these (failed) writes are attempted to storage at other sites. A recent modification has improved, but not completed fixed this.
The intermittent, low-level, load-related packet loss seen over external connections is still being tracked. Likewise we have been working to understand some remaining low level of packet loss seen within a part of our Tier1 network.

Ongoing Disk Server Issues

Notable Changes made since the last meeting.

The migration of Atlas data from "C" to "D" tapes continues. We have migrated over 700 of the 1300 tapes so far.

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.

Listing by category:

Databases:
- Switch LFC database to use new Database Infrastructure.
Castor:
- Update SRMs to new version, including updating to SL6. This will be done after the Castor 2.1.15 update.
- Update to Castor version 2.1.15. This awaits successful resolution and testing of the new version.
- Migration of data from T10KC to T10KD tapes (Affects Atlas & LHCb data).
Networking:
- Replace the UKLight Router. Then upgrade the 'bypass' link to the RAL border routers to 2*40Gbit.
Fabric
- Firmware updates on older disk servers.

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
122861	Green	Very Urgent	Waiting Reply	2016-07-14	2016-07-15	CMS	SAM3 CE is critical T1_UK_RAL
122827	Green	Less Urgent	In Progress	2016-07-12	2016-07-13	SNO+	Disk area at RAL
122818	Green	Less Urgent	In Progress	2016-07-12	2016-07-12	Atlas	Object Store at RAL
122804	Green	Less Urgent	Waiting Reply	2016-07-12	2016-07-15	SNO+	glite-transfer failure
122364	Green	Less Urgent	Waiting Reply	2016-06-27	2016-07-15		cvmfs support at RAL-LCG2 for solidexperiment.org
121687	Yellow	Less Urgent	On Hold	2016-05-20	2016-05-23		packet loss problems seen on RAL-LCG perfsonar
120810	Green	Urgent	In Progress	2016-04-13	2016-06-24	Biomed	Decommissioning of SE srm-biomed.gridpp.rl.ac.uk - forbid write access for biomed users
120350	Green	Less Urgent	In Progress	2016-03-22	2016-05-06	LSST	Enable LSST at RAL
119841	Red	Less Urgent	On Hold	2016-03-01	2016-04-26	LHCb	HTTP support for lcgcadm04.gridpp.rl.ac.uk
117683	Yellow	Less Urgent	On Hold	2015-11-18	2016-04-05		CASTOR at RAL not publishing GLUE 2

Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 729); CMS HC = CMS HammerCloud


Day	OPS	Alice	Atlas	CMS	LHCb	Atlas HC	CMS HC
13/07/16	100	100	100	100	100	100	100
14/07/16	100	100	100	100	100	100	100
15/07/16	100	100	100	100	100	100	100
16/07/16	100	100	100	100	100	100	100
17/07/16	100	100	100	100	100	100	100
18/07/16	100	100	100	100	100	100	100
19/07/16	100	100	100	100	100	100	100

@@ Line 11: / Line 11: @@
 |}
 * There has been saturation of the inbound 10Gbit OPN link at times over the last week. The bypass route to JANET has also shown high traffic volumes.
-* We have seen a couple of periods when there have been high numbers of batch jobs started multiple times. There were some on the 7th/8th July and again last night. The cause is not yet understood.
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