HECToR Monthly Report, January 2009

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

Dates covered: 08:00 1 January 2009 to 08:00 1 February 2009
Number of hours: 744

1: Availability

Scheduled down time: 10 hours.

Incidents

The following incidents were recorded:

SeverityNumber
15
23
323
41

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

Out of the 23 SEV-3 Incidents, 19 were attributed to single node failures.

Details of severity level 1 incidents

ID Date Description Length Attribution
Incident-711 12/01/2009 Link Inactive c17-1c1s0s0l4 c15-1c1s0s0l1 04:56 Cray
Incident-716 13/01/2009 Voltage fault on c7-1c0s0n1 causing link failure 01:20 Cray
Incident-751 16/01/2009 WWW/Helpdesk Unavailable 04:16 Site
Incident-801 22/01/2009 SDB node hung requiring system reload 04:08 Cray
Incident-831 29/01/2009 Link Inactive c12-1c2s0s1l5 c12-1c2s0s0l0 01:22 Cray

MTBF and Serviceability

AttributionFailuresMTBFUDTServiceability
Cray418311:46:0098.4%
Site173204:16:0099.4%
External000:00:00100%
Other000:00:00100%
Overall514616:02:0097.8%
  • 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 XT single node failures

Error Type Number
RX message header CRC Error 8
MCA bk0 error (Internal Opteron) 5
UME bk0/bk4 (Dimms) 3
s/w problem "general protection fault" 2 (1 single node, 1 double node)

The software problems related to a Casino job. This had not been seen before.

2: Courses

This information is supplied by NAG Ltd
Title of Course Dates Available places Ordinary attendees Paying attendees CSE Staff Total attending
Parallel Programming with MPI, Imperial College London 5 - 7 January 2009 16 13 0 0 13
OpenMP and Mixed-Mode Programming, Imperial College London 8 - 9 January 2009 16 12 0 0 12

3: Quality tokens

None set this month.

4: Hours worked

GroupDays workedFTEs
USL71.14.0
OSG74.04.2

5: Performance metrics

Technology Provision

Description TSL FSL Value
Technology reliability 85% 98.5% 97.8%
Technology throughput 7000 hours 8367 hours 8472 hours
Capability job completion rate 70% 90% N/A (*)
Technology MTBF 100 hours 126.4 hours 146 hours

(*) No Capability jobs (as per the contract definition) ran in January
There were 2 jobs which ran using more than 2265 cores.
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% 100%
Number of SP FTEs 7.3 8.0 8.7 8.2
SP serviceability 80% 99% 99.5% 100%