HECToR Monthly Report, December 2011

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: 15 hours 40 minutes. This includes extended maintenance required for the Phase 3 upgrade.

Incidents

The following incidents were recorded:

SeverityNumber
11
20
325
40

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

Out of the 25 SEV-3 Incidents, 25 were attributed to node failure events.

Details of severity level 1 incidents

ID Date Description Length Attribution
Incident-7051 21/12/2011 Maintenance overrun 00:39 Cray

MTBF and Serviceability

AttributionFailuresMTBFUDTServiceability
Cray1 732 00:3999.9%
Site000:00100.0%
External000:00 100.0%
Other/Unknown000:00 100.0%
Overall1 732 00:39 99.9%
  • 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 6
HT lockup error 3
Heartbeat error 3
Software error - kernel panic 2
Opteron link protocol error 1
Cold start - no return after maintenance(*) 1
Admin down (*) 10

(*) 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
SPRINT, NAG Oxford 1 December 2011 12 5 0 0 5
Fortran 95, University of Warwick 12 - 14 December 2011 20 18 1 0 19

5: Performance Metrics

Technology Provision

Description TSL FSL Value
Technology reliability 85% 98.5% 99.9%
Technology throughput 7000 hours 8367 hours 8588 hours
Capability job completion rate 70% 90% 100%
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% 99.2%
Number of SP FTEs 7.3 8.0 8.7 7.4
SP Serviceability 80% 99% 99.5% 100%