The HECToR Service is now closed and has been superceded by ARCHER.

HECToR Monthly Report, December 2010

Information on the utilisation, disk allocations, slowdowns and helpdesk statistics can be found in the associated SAFE monthly report.

This report relates to the Phase 2a service only. Performance statistics for the non-contractual Phase 2b system can be found here.

Dates covered: 08:00 1 December 2010 to 08:00 1 January 2011
Number of hours: 720

1: Availability

Scheduled down time: 12 hours 43 minutes.

Incidents

The following incidents were recorded:

SeverityNumber
15
20
310
40

Of the four severity levels, level 1 corresponds to a contractual failure.

Out of the 9 SEV-3 Incidents, 9 were attributed to single node failure events.

Details of severity level 1 incidents

ID Date Description Length Attribution
Incident-5306 01/12/2010 Blue Arc Failure /home file system hung 02:48 Cray
Incident-5316 04/12/2010 Cabinet Emergency Power Off 37:25 Cray
Incident-5331 08/12/2010 Link Inactive 01:49 Cray
Incident-5341 12/12/2010 Link Inactive 01:47 Cray
Incident-5416 28/12/2010 Voltage Fault on Module 01:37 Cray

MTBF and Serviceability

AttributionFailuresMTBFUDTServiceability
Cray514645:2693.8%
Site000:00100%
External000:00100%
Other000:00100%
Overall514645:2693.8%
  • Note 1: Serviceability%= 100*(WCT-SDT-UDT)/(WCT-SDT)
  • Note 2: MTBF (Mean Time Between Failures) is defined as 732/Number of failures.

Details of single node failures

Error Type Number
RX message CRC Error 2
RX message header CRC Error 5
Software error - kernel panic 2

2: Courses

This information is supplied by NAG Ltd
Title of Course Dates Available Places Ordinary Attendees Paying Attendees CSE Staff Total Attending
Parallel IO, University of Warwick 6 December 2010 20 12 0 0 12
Parallel Programming with MPI, University College London 12 - 14 December 2010 12 9 0 0 9

3: Quality Tokens

Date Tokens Awarded Comment Consortium
08/12/2010 Negative Tokens. No comments from the user. Tokens awarded same day as system failure n02
18/12/2010 * * * * * Fast! Beginning users questions and answers quickly resolved. Thanks x01
29/12/2010 * * * * Phase2B System is now excellent e82

4: Hours Worked

GroupDays workedFTEs
USL67.13.8
OSG67.63.8

5: Performance Metrics

Technology Provision

Description TSL FSL Value
Technology reliability 85% 98.5% 93.8%
Technology throughput 7000 hours 8367 hours 8088 hours
Capability job completion rate 70% 90% 100.0%
Technology MTBF 100 hours 126.4 hours 146 hours

Note: Technology throughput is calculated: 12*(732-UDT-SDT); 732 - annual average number of hours in a month

Note: MTBF is calculated as 732/number of failures

Service Provision

Description TSL FSL USL Value
Percentage of non-in-depth
queries resolved within one day
85% 97% 99% 98.2%
Number of SP FTEs 7.3 8.0 8.7 7.6
SP Serviceability 80% 99% 99.5% 100%