DRAFT - DO NOT USE - RAL Tier1 Operations Report for 28st October 2015
| Review of Issues during the week 14th to 21st October 2015.
|
| Resolved Disk Server Issues
|
| Current operational status and issues
|
- The LHCb problem with 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.
- 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.
- Long-standing CMS issues. The two items that remain are CMS Xroot (AAA) redirection and file open times. Work is ongoing into the Xroot redirection with a new server having been added in recent weeks. File open times using Xroot remain slow but this is a less significant problem.
| Ongoing Disk Server Issues
|
| Notable Changes made since the last meeting.
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- Upgrade of remaining Castor disk servers (those in tape-backed service classes) to SL6. This will be transparent to users.
- Some detailed internal network re-configurations to enable the removal of the old 'core' switch from our network. This includes changing the way the UKLIGHT router connects into the Tier1 network.
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- Castor:
- Update SRMs to new version (includes updating to SL6).
- Update disk servers to SL6 (ongoing)
- Update to Castor version 2.1.15.
- Networking:
- Complete changes needed to remove the old core switch from the Tier1 network.
- Make routing changes to allow the removal of the UKLight Router.
- Fabric
- Firmware updates on remaining EMC disk arrays (Castor, LFC)
| 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
|
| 117171
|
|
very urgent
|
waiting for reply
|
2015-10-24
|
2015-10-27
|
LHCb
|
Aborted pilots on arc-ce02.gridpp.rl.ac.uk
-
|
116866
|
Green
|
Less Urgent
|
On Hold
|
2015-10-12
|
2015-10-19
|
SNO+
|
snoplus support at RAL-LCG2 (pilot role)
|
| 116864
|
Green
|
Urgent
|
In Progress
|
2015-10-12
|
2015-10-26
|
CMS
|
T1_UK_RAL AAA opening and reading test failing again...
|
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
|
| 14/10/15 |
100 |
100 |
100 |
100 |
100 |
91 |
n/a |
|
| 15/10/15 |
100 |
100 |
98 |
100 |
100 |
85 |
100 |
Single SRM test failure (ould not open connection to srm-atlas.gridpp.rl.ac.uk:8443)
|
| 16/10/15 |
100 |
100 |
100 |
98 |
100 |
89 |
100 |
Short problem with glexec in the early hours of the morning.
|
| 17/10/15 |
100 |
100 |
100 |
100 |
100 |
95 |
100 |
|
| 18/10/15 |
100 |
100 |
100 |
100 |
100 |
92 |
n/a |
|
| 19/10/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 20/10/15 |
100 |
100 |
100 |
100 |
100 |
93 |
100 |
|
