NERSC System Availability Statistics

FY02 System Availability Statistics

Individual Mainframe Availability Averages
Mainframe Monthly Availability Averages
Small Systems and Storage Availability Averages
Small Systems and Storage Monthly Availability Averages
Overall Systems Availability Averages
Overall Systems Availability Details

FY01 System Availability Statistics
FY00 System Availability Statistics
FY99 System Availability Statistics
FY98 System Availability Statistics

FY00 User account Statistics
FY99 User account Statistics

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 (Oth). The Oth 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 Overall Systems Availability Details.

FY01 Mainframe Monthly Availability Percentages

FY02 Mainframe Monthly Availability Percentages

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

J90/SV1s

Killeen 99.63 100 99.96 99.70 99.9 100 99.87 99.39 100 99.71 98.10 100

Bhaskara 99.87 99.92 100 100 100 98.57 100 98.89 99.81 100 99.70 100

Seymour 99.87 100 100 100 100 100 100 99.39 100 99.71 99.71 100

T3E

Mcurie 99.73 100 99.78 99.71 99.26 99.00 99.86 98.74 99.07 100 98.95 99.69

IBM SP

Seaborg 96.01 99.08 100 99.86 100 100 99.54 98.95 100 100 99.16 100

FY02 Mainframe Monthly Availability Percentages
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
J90/SV1s
Killeen	99.63	100	99.96	99.70	99.9	100	99.87	99.39	100	99.71	98.10	100
Bhaskara	99.87	99.92	100	100	100	98.57	100	98.89	99.81	100	99.70	100
Seymour	99.87	100	100	100	100	100	100	99.39	100	99.71	99.71	100
T3E
Mcurie	99.73	100	99.78	99.71	99.26	99.00	99.86	98.74	99.07	100	98.95	99.69
IBM SP
Seaborg	96.01	99.08	100	99.86	100	100	99.54	98.95	100	100	99.16	100

FY01 Auxiliary System Monthly Availability Percentages

FY02 Auxiliary System Monthly Availability Percentages

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

File System

AFS 100 100 100 100 100 100 100 100 99.72 100 100 100

File Storage Systems

HPSS 99.78 99.87 100 99.58 99.64 99.86 99.88 99.85 98.75 100 99.60 99.41

Archive 100 99.51 98.75 99.32 99.70 99.83 97.97 99.68 99.92 99.93 99.70 99.46

Math/Visualization Systems

Newton 100 100 99.99 100 100 99.44 100 97.13 100 99.84 99.87 100

Escher 100 100 100 100 100 99.67 99.31 99.42 100 100 99.46 100

FY02 Auxiliary System Monthly Availability Percentages
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
File System
AFS	100	100	100	100	100	100	100	100	99.72	100	100	100
File Storage Systems
HPSS	99.78	99.87	100	99.58	99.64	99.86	99.88	99.85	98.75	100	99.60	99.41
Archive	100	99.51	98.75	99.32	99.70	99.83	97.97	99.68	99.92	99.93	99.70	99.46
Math/Visualization Systems
Newton	100	100	99.99	100	100	99.44	100	97.13	100	99.84	99.87	100
Escher	100	100	100	100	100	99.67	99.31	99.42	100	100	99.46	100

System Availability Details

**System Availability Details**
FY02 - October 2001 Through September 2002
	Scheduled Outages % Avail		Unscheduled Outages % Avail			Overall Avail %	Gross Avail %	Sched Avail %	MTBI*	MTTR**	MTBF***
System	H/W	S/W	H/W	S/W	Oth				Hours	Hours	(Day:Hour:Min)
Vector	99.87	99.94	99.89	99.93	99.94	99.54	99.55	99.74	486	2.7	21:11:46
Parallel (T3E/SP)	99.90	99.62	99.84	99.64	99.93	98.98	98.99	99.46	357	3.3	14:18:02
Storage	99.90	99.21	99.90	99.69	100	98.65	98.65	99.58	140	1.6	05:19:47
File Servers	100	100	100	100	100	99.98	99.93	99.98	8760	2.0	29:22:00
Math/Vis	99.89	99.76	99.96	99.90	99.89	99.41	99.41	99.75	461	2.26	20:02:30

*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 Failure = Total wall clock hours - Total downtime hours/Total downtime hours -1

**Cumulative Downtime Hours & Occurrences**
FY02 - October 2001 Through September 2002
	Scheduled Downtimes		Unscheduled Downtimes			Total Downtime	Total Avail Hours	Number of Outages
System	H/W	S/W	H/W	S/W	Oth			H/W	S/W	Oth
Vector	35:19	15:40	28:37	17:55	14:39	112:10	26280	30	21	3
Parallel (T3E/SP)	16:45	66:13	28:01	62:47	12:03	185:49	17520	15	32	2
Storage	25:28	139:01	17:42	54:18	0:06	236:35	17520	15	108	2
File Servers	0:00	0:00	0:00	2:00	0:00	2:00	8760	0	1	0
Math/Vis	18:29	41:38	7:37	16:47	18:59	103:30	17520	15	21	2