Tier1 Operations Report 2018-01-24

RAL Tier1 Operations Report for 24th January 2018

Review of Issues during the week 18th January 2018 to 24th January 2018

• Patching for Spectre and Meltdown was taking place last week. (E.g. an outage of Castor for a few hours last Wednesday, 17th Jan).
• Problems since last week with the Atlas Castor instance. There has been a high rate of deletion requests, and the back end stager database has been struggling to keep up with the total load (reads, writes and deletes). Atlas have backed off at the moment. No more specific cause for the problems found but investigations ongoing.
• There will be an intervention on one of the BMS (Building Management Systems) in the R89 machine room on Wednesday. It has been intermittently faulty causing some system restarts. In one case the chillers failed to restart. This system manages the pumps. The intervention should take less than 30 minutes. On Tuesday one of the pumps will be reconnected ‘stand-alone’ and checked it works OK – and this will be used to maintain flow during the BMS controller swap.
• A prolonged downtime required with CASTOR/ATLAS. The issue is primarily to do with the increased load on the Atlas Stager DB. Extensive investigations has revelled it to be linked with garbage collection. The solution appears to require to re-create the whole DISKCOPY table and rebuilt the associated indexes. For this it was required for the stager daemon to be shut down and, hence, the declare downtime.

Current operational status and issues

• Ongoing security patching.

Resolved Castor Disk Server Issues

• gdss736 (lhcbDst - D1T0) – rebuilt and back in production (RO)

Ongoing Castor Disk Server Issues

• gdss717 (CMSTape - D0T1) – multiple drive failure

Limits on concurrent batch system jobs.

• CMS Multicore 550

Notable Changes made since the last meeting.

• Security patching done or underway.

Entries in GOC DB starting since the last report.

• None

Declared in the GOC DB

Service	Scheduled?	Outage/At Risk	Start	End	Duration	Reason
srm-atlas.gridpp.rl.ac.uk,	UNSCHEDULED	OUTAGE	22/01/2018 22:00	23/01/2018 10:00	12 hours	urgent fixes needed on Oracle DB backend - extension
srm-atlas.gridpp.rl.ac.uk,	UNSCHEDULED	OUTAGE	22/01/2018 17:45	22/01/2018 22:00	4 hours and 15 minutes	urgent fixes needed on Oracle DB backend
srm-alice.gridpp.rl.ac.uk, srm-atlas.gridpp.rl.ac.uk, srm-biomed.gridpp.rl.ac.uk, srm-cert.gridpp.rl.ac.uk, srm-cms-disk.gridpp.rl.ac.uk, srm-cms.gridpp.rl.ac.uk, srm-dteam.gridpp.rl.ac.uk, srm-ilc.gridpp.rl.ac.uk, srm-lhcb.gridpp.rl.ac.uk, srm-lhcb.gridpp.rl.ac.uk, srm-mice.gridpp.rl.ac.uk, srm-minos.gridpp.rl.ac.uk, srm-na62.gridpp.rl.ac.uk, srm-pheno.gridpp.rl.ac.uk, srm-preprod.gridpp.rl.ac.uk, srm-snoplus.gridpp.rl.ac.uk, srm-solid.gridpp.rl.ac.uk, srm-t2k.gridpp.rl.ac.uk,	SCHEDULED	OUTAGE	17/01/2018 10:00	17/01/2018 13:00	3 hours	Outage of Castor Storage to apply Security patches.
lcglb01.gridpp.rl.ac.uk, lcglb02.gridpp.rl.ac.uk, lcgwms04.gridpp.rl.ac.uk, lcgwms05.gridpp.rl.ac.uk,	SCHEDULED	OUTAGE	12/01/2018 10:00	19/01/2018 12:00	7 days, 2 hours	WMS Decommissioning RAL Tier1

Advanced warning for other interventions

The following items are being discussed and are still to be formally scheduled and announced.

Ongoing or Pending - but not yet formally announced:

Listing by category:

• Castor:
  • Update systems to use SL7 and configured by Quattor/Aquilon. (Tape servers done)
  • Move to generic Castor headnodes.
• Echo:
  • Update to next CEPH version ("Luminous").
• Networking
  • Extend the number of services on the production network with IPv6 dual stack. (Done for Perfsonar, FTS3, all squids and the CVMFS Stratum-1 servers).
• Internal
  • DNS servers will be rolled out within the Tier1 network.
  • Infrastructure
• Testing of power distribution boards in the R89 machine room is being scheduled for some time late July / Early August. The effect of this on our services is being discussed.

Open GGUS Tickets (Snapshot during morning of meeting)

Request id	Affected vo	Status	Priority	Date of creation	Last update	Type of problem	Subject
117683	none	on hold	less urgent	18/11/2015	03/01/2018	Information System	CASTOR at RAL not publishing GLUE 2
124876	ops	on hold	less urgent	07/11/2016	13/11/2017	Operations	[Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
127597	cms	on hold	urgent	07/04/2017	05/10/2017	File Transfer	Check networking and xrootd RAL-CERN performance
131815	t2k.org	in progress	less urgent	13/11/2017	22/01/2018	Storage Systems	Extremely long download times for T2K files on tape at RAL
132589	lhcb	in progress	very urgent	21/12/2017	10/01/2018	Local Batch System	Killed pilots at RAL
132712	other	in progress	less urgent	04/01/2018	22/01/2018	Other	support for the hyperk VO (RAL-LCG2)
132802	cms	in progress	urgent	11/01/2018	23/01/2018	CMS_AAA WAN Access	Low HC xrootd success rates at T1_UK_RAL
132844	atlas	in progress	urgent	14/01/2018	19/01/2018	Storage Systems	UK RAL-LCG2 DATADISK transfer errors "DESTINATION OVERWRITE srm-ifce err:"
132935	atlas	in progress	less urgent	18/01/2018	22/01/2018	Storage Systems	UK RAL-LCG2: deletion errors
132963	atlas	waiting for reply	top priority	21/01/2018	22/01/2018	Middleware	RAL arc-ce03 flakey

Availability Report

Day	OPS	Alice	Atlas	CMS	LHCb	Atlas Echo	Comment
17/01/18	87.15	100	100	100	100	100
18/01/18	100	100	100	100	98	100
19/01/18	100	100	100	100	100	100
20/01/18	100	92	100	100	100	100
21/01/18	100	0	100	100	100	100
22/01/18	100	49	65	100	89	100
23/01/18	100	94	0	100	94	100

Hammercloud Test Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_UCORE, Template 841); CMS HC = CMS HammerCloud

Day	Atlas HC	CMS HC	Comment
17/01/18	92	100
18/01/18	100	100
19/01/18	100	99
20/01/18	100	99
21/01/18	100	100
22/01/18	59	100
23/01/18	100	99

Notes from Meeting.

• None yet.