Difference between revisions of "Tier1 Operations Report 2015-11-04"
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Latest revision as of 10:56, 4 November 2015
RAL Tier1 Operations Report for 4th November 2015
| Review of Issues during the week 28th October to 4th November 2015. |
- We again saw high load on the AtlasTape Castor instance - exacerbated by the failure of some disk servers in the cache in front of this tape area.
| Resolved Disk Server Issues |
- gdss665 (AtlasTape - D0T1) failed on Sat (24th Oct). Following a disk replacement and updating the firmware in the disk controller the system was re-run through the acceptance testing for 5 days before being returned to service yesterday (3rd November).
- gdss663 (AtlasTape - D0T1) failed on Sun (25th Oct). Following a disk and battery replacement and updating the firmware in the disk controller the system was re-run through the acceptance testing for 5 days before being returned to service yesterday (3rd November).
| 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 |
- gdss707 (AtlasDataDisk - D1T0) has been out of production since Friday (16th Oct). The server was drained and is currently undergoing testing with fabric.
- gdss664 (AtlasTape - D0T1) was removed from service on the 28th Oct. The system was having some problems running some network commands. These were resolved by a reboot. A failing disk was also replaced. The system has had the disk controller firmware updated and has been re-running the acceptance tests since yesterday (3rd Nov).
| Notable Changes made since the last meeting. |
- None
| Declared in the GOC DB |
- None
| 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. |
- None
| Open GGUS Tickets (Snapshot during morning of meeting) |
| GGUS ID | Level | Urgency | State | Creation | Last Update | VO | Subject |
|---|---|---|---|---|---|---|---|
| 117277 | Green | Urgent | Waiting for Reply | 2015-10-30 | 2015-11-03 | Atlas | UK RAL-LCG2 staging error "bring-online timeout has been exceeded" (over 500 errors) |
| 117248 | Green | Less Urgent | In Progress | 2015-10-28 | 2015-11-03 | Incorrect Certificate for SRM (new certs requested but not yet deployed) | |
| 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... |
| 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 |
|---|---|---|---|---|---|---|---|---|
| 28/10/15 | 100 | 100 | 100 | 100 | 100 | 97 | 100 | |
| 29/10/15 | 100 | 100 | 100 | 100 | 100 | 93 | 100 | |
| 30/10/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| 31/10/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| 01/11/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| 02/11/15 | 100 | 100 | 100 | 100 | 96 | 100 | 100 | Single SRM test failure. "could not open connection to srm-lhcb.gridpp.rl.ac.uk" |
| 03/11/15 | 100 | 100 | 100 | 100 | 100 | 91 | 100 |
