FY06 - OCTOBER 2005 - NERSC AVAILABILITY STATISTICS
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ARCHIVE
ARCHIVE OCTOBER 2005 ● Scheduled Availability Averages
ARCHIVE OCTOBER 2005 ● Monthly Availability
ARCHIVE OCTOBER 2005 ●  Overall System Availability Averages
ARCHIVE OCTOBER 2005 ●  Monthly Availability Percentages
ARCHIVE OCTOBER 2005 ●  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.
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FY06 Monthly Availability Percentages up to OCTOBER of FY06
  OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
STORAGE    
ARCHIVE 99.87%                      
      ` System Availability Details        
  FY06 - OCTOBER 2005  
   
        Scheduled Un-Scheduled Overall Sched *MTBI **MTTR ***MTBF  
  System H/W S/W H/W S/W Other Avail % Avail % (Hours) (Hours) (d hh:mm)  
  ARCHIVE 99.74% 99.47% 99.87% 100.00% 100.00% 99.08% 99.87% 0 1.0 6 16:17  
     
  *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 - OCTOBER 2005  
   
          Scheduled Un-Scheduled Total Total Number of Outages  
  System H/W S/W H/W S/W Other Downtime Avail Hrs H/W S/W Other  
  ARCHIVE 1:58 3:55 0:58 0:00 0:00 6:51 744 2 2 0  
                         
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