HECToR Monthly Report, January 2012

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

Dates covered: 08:00 1 December 2011 to 08:00 1 January 2012
Number of hours: 744

1: Availability

Scheduled down time: 60 hours 37 minutes. This includes extended maintenance required for the Phase 3 upgrade and acceptance testing.

Incidents

The following incidents were recorded:

SeverityNumber
13
20
321
40

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

Out of the 21 SEV-3 Incidents, 21 were attributed to node failure events.

Details of severity level 1 incidents

ID Date Description Length Attribution
Incident-7141 18/01/2012 Maintenance overrun 01:15 Cray
Incident-7176 24/01/2012 System hung after "warmswap" problem 09:01 Cray
Incident-7186 27/01/2012 Acceptance tests overrun 23:32 Cray

MTBF and Serviceability

AttributionFailuresMTBFUDTServiceability
Cray3 244 33:4895.1%
Site000:00100.0%
External000:00 100.0%
Other/Unknown000:00 100.0%
Overall3 244 33:48 95.1%
  • 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
MCA bank 4 error 10
HT lockup error 3
Module voltage fault 3
Software error - kernel panic 3
Thermtrip on Opteron processor (Failed during acceptance testing)(*) 1
Admindown by Node Health Check script(*) 1

(*) No user job lost

2: Courses

This information is supplied by NAG Ltd
Title of Course Dates Available Places Ordinary Attendees Paying Attendees CSE Staff Total Attending
OpenMP, Imperial College 5-6 January 2012 45 10 0 0 10
Parallel Programming with MPI, Imperial College 9 - 11 January 2012 45 19 1 0 19
An Introduction to CUDA Programming, University of Leicester 24 - 25 January 2012 25 10 6 0 16

5: Performance Metrics

Technology Provision

Description TSL FSL Value
Technology reliability 85% 98.5% 95.1%
Technology throughput 7000 hours 8367 hours 7651 hours
Capability job completion rate 70% 90% 93.3%
Technology MTBF 100 hours 126.4 hours 732

Note: Technology throughput is calculated: 12*(732-UDT-SDT), where 732 is the 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% 99.4%
Number of SP FTEs 7.3 8.0 8.7 8.8
SP Serviceability 80% 99% 99.5% 100%