Difference between revisions of "Tier1 Operations Report 2015-04-01"

Latest revision as of 10:18, 1 April 2015

Review of Issues during the fortnight 18th March to 1st April 2015.

There were problems with the ARGUS server that affected batch work on Wednesday 18th March. This was fixed following a callout in the evening.
A further investigation into the primary Tier1 router on the morning of Thursday 19th March failed to fix the problem whereby the router fails after a few minutes in service.
On Friday 20th, a problem was found and fixed that caused gridmap file updates to fail.
On Thursday 26th March, an uplink cable was replaced on a core switch. This may have fixed connectivity problems reported by the Nebraska T2 in the USA.
On Friday the 27th March a PDU powering a network switch turned itself off. This affected connectivity to many of the database servers. Staff attended site and reset the PDU. Most services were affected for approximately 2.5 hours (9:30 pm until midnight).

Resolved Disk Server Issues

Current operational status and issues

We are running with a single router connecting the Tier1 network to the site network, rather than a resilient pair.

Ongoing Disk Server Issues

Notable Changes made this last week.

gfal2 and davix rpms are in the process of being updated across the worker nodes.

Declared in the GOC DB

Service	Scheduled?	Outage/At Risk	Start	End	Duration	Reason
All Castor (all SRM endpoints)	SCHEDULED	OUTAGE	08/04/2015 10:00	08/04/2015 14:00	4 hours	Upgrade of Castor storage to version 2.1.14-15
Whole site	SCHEDULED	WARNING	01/04/2015 07:45	01/04/2015 11:00	3 hours and 15 minutes	Warning on site for network test/reconfiguration and load test of UPS/generator.

Advanced warning for other interventions

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

Separate some non-Tier1 services off our network so as to be able to more easily investigate the router problems.
Update Castor to 2.1-14-15 (Proposed date - Wednesday 8th April).

Listing by category:

Databases:
- Switch LFC/3D to new Database Infrastructure.
- Update to Oracle 11.2.0.4
Castor:
- Update Castor to 2.1.14-15 (Proposed date - Wednesday 8th April).
- Update SRMs to new version (includes updating to SL6).
- Fix discrepancies found in some of the Castor database tables and columns. (The issue has no operational impact.)
Networking:
- Resolve problems with primary Tier1 Router
- Enable the RIP protocol for updating routing tables on the Tier1 routers. (Install patch to Router software).
- Increase bandwidth of the link from the Tier1 into the RAL internal site network to 40Gbit.
- Make routing changes to allow the removal of the UKLight Router.
Fabric
- Firmware updates on remaining EMC disk arrays (Castor, FTS/LFC)

Entries in GOC DB starting since the last report.

Service	Scheduled?	Outage/At Risk	Start	End	Duration	Reason
Whole site	SCHEDULED	WARNING	01/04/2015 07:45	01/04/2015 11:00	3 hours and 15 minutes	Warning on site for network test/reconfiguration and load test of UPS/generator.
Whole site	SCHEDULED	WARNING	19/03/2015 07:45	19/03/2015 08:30	45 minutes	Warning during tests of Tier1s network router. Possibility of two short (few minute) breaks in connectivity to the RAL Tier1.

Open GGUS Tickets (Snapshot during morning of meeting)


GGUS ID	Level	Urgency	State	Creation	Last Update	VO	Subject
112721	Green	Less Urgent	In Progress	2015-03-28	2015-03-30	Atlas	RAL-LCG2: SOURCE Failed to get source file size
112713	Green	Urgent	In Progress	2015-03-27	2015-03-31	CMS	Please clean up unmerged area - RAL
111699	Green	Less Urgent	In Progress	2015-02-10	2015-03-23	Atlas	gLExec hammercloud jobs keep failing at RAL-LCG2 & RALPP
109694	Red	Urgent	In Progress	2014-11-03	2015-03-31	SNO+	gfal-copy failing for files at RAL
108944	Red	Less Urgent	In Progress	2014-10-01	2015-03-30	CMS	AAA access test failing at T1_UK_RAL

Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 508); CMS HC = CMS HammerCloud


Day	OPS	Alice	Atlas	CMS	LHCb	Atlas HC	CMS HC	Comment
18/03/15	100	100	99	92	92	100	100	CE tests failed owing to ARGUS problem.
19/03/15	100	100	100	96	100	99	98	Failed single SRM test and had some CE test errors. At time of planned network intervention.
20/03/15	100	100	100	100	100	98	97
21/03/15	100	100	100	100	100	100	98
22/03/15	100	100	100	100	100	100	99
23/03/15	100	100	100	100	100	100	96
24/03/15	100	100	100	100	100	100	100
25/03/15	100	100	100	100	100	100	100
26/03/15	100	100	100	100	100	100	100
27/03/15	92	97	92	100	100	89	100	PDU problems caused switch to be without power
28/03/15	97	95	96	100	100	98	82	PDU problems caused switch to be without power
29/03/15	100	100	100	100	100	100	100
30/03/15	98	100	100	100	100	100	100	Single failed file transfer.
31/03/15	100	100	100	100	100	95	100

@@ Line 11: / Line 11: @@
 * There were problems with the ARGUS server that affected batch work on Wednesday 18th March. This was fixed following a callout in the evening.
 * A further investigation into the primary Tier1 router on the morning of Thursday 19th March failed to fix the problem whereby the router fails after a few minutes in service.
-* A problem was found and fixed that caused gridmap file updates to fail.
+* On Friday 20th, a problem was found and fixed that caused gridmap file updates to fail.
 * On Thursday 26th March, an uplink cable was replaced on a core switch. This may have fixed connectivity problems reported by the Nebraska T2 in the USA.
 * On Friday the 27th March a PDU powering a network switch turned itself off. This affected connectivity to many of the database servers. Staff attended site and reset the PDU. Most services were affected for approximately 2.5 hours (9:30 pm until midnight).