HECToR Monthly Report, May 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 May 2009 to 08:00 1 June 2009
Number of hours: 744

1: Availability

Scheduled down time: 15.4 hours.

Incidents

The following incidents were recorded:

SeverityNumber
12
22
323
40

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

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

Details of severity level 1 incidents

ID Date Description Length Attribution
Incident-1406 03/05/2009 Failure of IO riser to OST15 08:16 Cray
Incident-1506 20/05/2009 Maintenance session over-run 00:23 Cray

MTBF and Serviceability

AttributionFailuresMTBFUDTServiceability
Cray236608:39:0098.8%
Site000:00:00100%
External000:00:00100%
Other000:00:00100%
Overall236608:39:0098.8%
  • 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 9
MCA bk0/bk2 error (Internal Opteron) 3
UME bk0/bk4 (Dimms) 3
Coldstart error (node failing to restart after reboot) 4
Heartbeat error 2
Software problem 2

Note: During "coldstart" errors, no user jobs were affected.

2: Courses

This information is supplied by NAG Ltd
Title of Course Dates Available places Ordinary attendees Paying attendees CSE Staff Total attending
Tools and Techniques for Optimising Parallel Codes, NAG Manchester 13 - 15 May 2009 8 4 0 1 5
Introduction to High Performance Computing, University of Warwick 18 - 19 May 2009 25 14 0 0 14

3: Quality tokens

None set this month.

4: Hours worked

GroupDays workedFTEs
USL79.64.5
OSG78.54.4

5: Performance metrics

Technology Provision

Description TSL FSL Value
Technology reliability 85% 98.5% 98.8%
Technology throughput 7000 hours 8367 hours 8495 hours
Capability job completion rate 70% 90% 100%
Technology MTBF 100 hours 126.4 hours 366 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% 99.0%
Number of SP FTEs 7.3 8.0 8.7 8.9
SP serviceability 80% 99% 99.5% 100%