RAL Tier1 Operations Report for 12th August 2015
| Review of Issues during the week 29th July and 5th August 2015.
|
- There was a site network outage on Saturday 8th August. The Tier1 was affected from approx 07:30 until 10:00. The issue was resolved when a member of the network team came on site and re-seated a card in a router.
| Resolved Disk Server Issues
|
| Current operational status and issues
|
- The post mortem review of the network incident on the 8th April is being finalised.
- The intermittent, low-level, load-related packet loss over the OPN to CERN is still being tracked.
- There are some on-going issues for CMS. These are a problem with the Xroot (AAA) redirection accessing Castor; Slow file open times using Xroot; and poor batch job efficiencies.
| Ongoing Disk Server Issues
|
- gdss720 (part of ATLASDATADISK) crashed on Tuesday 11th. The machine is currently being drained so the fabric team can replace some components.
| Notable Changes made since the last meeting.
|
- Deployed changes to remove glite-CLUSTER node from information system and shutdown cream-ce01 and cream-ce02.
- Atlas have transferred a share of their FTS service back to RAL.
- The test of the updated worker node configuration (with grid middleware delivered via CVMFS) continues on a one whole batch of Worker Nodes. We are now draining a second batch of worker nodes.
- Investigative work into the ongoing issues for CMS Castor. We have now changed the I/O scheduler on the disk servers.
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- Upgrade of Castor disk servers to SL6. We plan to do this during the second part of August (17-28). Rollout plan to be discussed.
- Upgrade of the Oracle databases behind Castor to version 11.2.0.4. This is a multi-step intervention. Whilst we need to confirm exact dates we are looking at the following days in September, but the dates are likely to be revised:
- Tuesday 8th: day's Outage for Atlas & GEN.
- Tuesday 15th: at risk on Atlas & GEN.
- Thursday 17th: day's Outage for ALL instances.
- Tuesday 22nd: day's at risk for ALL instances
- Thursday 24th: Half day outage for ALL instances.
- Extending the rollout of the new worker node configuration.
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- Update to Oracle 11.2.0.4. This will affect all services that use Oracle databases: Castor, Atlas Frontier (LFC done)
- Castor:
- Update SRMs to new version (includes updating to SL6).
- Update the Oracle databases behind Castor to version 11.2.0.4. Will require some downtimes (See above)
- Update disk servers to SL6.
- Update to Castor version 2.1.15.
- Networking:
- 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.
- Cabling/switch changes to the network in the UPS room to improve resilience.
- 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
|
UNSCHEDULED
|
WARNING
|
04/08/2015 15:00
|
05/08/2015 15:00
|
24 hours
|
Warning on Site following investigations of problem with network router.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 115573
|
Green
|
Urgent
|
In progress
|
2015-08-07
|
2015-08-11
|
CMS
|
T1_UK_RAL Consistency Check (August 2015)
|
| 115512
|
|
very urgent
|
waiting for reply
|
2015-08-05
|
2015-08-12
|
lhcb
|
User cannot submit jobs directly to RAL
|
| 115434
|
Green
|
Less Urgent
|
waiting for reply
|
2015-08-03
|
2015-08-07
|
SNO+
|
glite-wms-job-status warning
|
| 115387
|
Green
|
Less Urgent
|
In Progress
|
2015-08-03
|
2015-08-11
|
SNO+
|
XRootD for SNO+ from RAL
|
| 115290
|
Green
|
Less Urgent
|
On Hold
|
2015-07-28
|
2015-07-29
|
|
FTS3@RAL: missing proper host names in subjectAltName of FTS agent nodes
|
| 108944
|
Red
|
Less Urgent
|
In Progress
|
2014-10-01
|
2015-07-17
|
CMS
|
AAA access test failing at T1_UK_RAL
|
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
|
| 05/08/15 |
100 |
100 |
98.0 |
92.0 |
100 |
100 |
51 |
Atlas had a Single SRM test failure. CMS had high load on disk servers.
|
| 06/08/15 |
100 |
100 |
100 |
83 |
100 |
100 |
100 |
Several SRM test failures. (CMS instance known to be performing badly as a lot of batch job failures).
|
| 07/08/15 |
100 |
100 |
98 |
100 |
100 |
100 |
100 |
Atlas had one SRM failure [SRM_INVALID_PATH] No such file or directory
|
| 08/08/15 |
93.9 |
100 |
98 |
85 |
89 |
95 |
85 |
Site network problems
|
| 09/07/15 |
100 |
100 |
100 |
100 |
89 |
100 |
100 |
LHCb had one SRM failure, [SRM_INVALID_PATH] No such file or directory
|
| 10/08/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 11/07/15 |
100 |
100 |
100 |
100 |
100 |
100 |
56 |
|
