FY06 - MARCH 2006 - NERSC AVAILABILITY STATISTICS

NGF - Statistical Data starting January 2006

NGF MARCH 2006 ● Scheduled Availability Averages

NGF MARCH 2006 ● Monthly Availability

NGF MARCH 2006 ● Overall System Availability Averages

NGF MARCH 2006 ● Monthly Availability Percentages

NGF MARCH 2006 ● Systems Availability Details

● System Availability Statistics - Main Page ●

Availability percentages are calculated using gross wall clock time. Outages/periods of unavailability (downtime) are subtracted from the total wall clock hours and presented as the percentage of the time the system was available to the users. The downtimes are scheduled and unscheduled periods of non-availability grouped into the following three categories: Hardware (H/W), Software (S/W), and Other (Other). The Other category includes unavailable time caused by power outages, environmental conditions and planned power-downs for equipment relocations or computer room modifications, security related conditions, etc.

To view a summary of number of downtimes and cumulative hours, go to the

Systems Availability Details.

FY06 Monthly Availability Percentages up to MARCH of FY06

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

STORAGE

NGF

98.48%

99.29%

97.59%

System Availability Details

FY06 - MARCH 2006

Scheduled

Un-Scheduled

Overall

Sched

*MTBI

**MTTR

***MTBF

System

H/W

S/W

H/W

S/W

Other

Avail %

(Hours)

(d hh:mm)

NGF

100.00%

99.63%

100.00%

98.43%

100.00%

98.06%

98.42%

5.9

11 14:34

*Mean Time Between Interruptions = Total wall clock hours/total number of downtime periods

**Mean Time To Restoral = Total downtime hours/total number of downtime periods

***Mean Time Between Failures = Total wall clock hours - Total downtime hours/Total downtime hours -1

Outage Hours & Number of Occurrences

FY06 - MARCH 2006

Scheduled

Un-Scheduled

Total

Number of Outages

System

H/W

S/W

H/W

S/W

Other

Downtime

Avail Hrs

H/W

S/W

Other

NGF

0:00

8:00

0:00

33:58

0:00

41:58

2160