Appendix E Estimating Size Of Nec Storage Performanceoptimizer Files - NEC Storage Performance Monitor/Optimizer User Manual

Appendix E Estimating Size of NEC Storage PerformanceOptimizer Files

Appendix E
The size of a performance optimizing log file can be estimated by applying the number of disk
array components (the number of RANKs and logical disks (LDs)), the storage period of statistic
information, and logging Interval time to the following equations:
The size of the log file (byte) = 80 + A (Statistic information storage period (minute) Logging
Interval (minute))
A = 80 + Number of RANKs
m: A value obtained by calculating h by each RANK according to the following equations
h = 4 i
When the quotient of (Number of LDs in a RANK
Moreover, the file size calculated by the equations above assumes a general case. If the
configuration is changed or a logical disk is transferred during the statistic information
accumulation period, the actual file size becomes larger than the calculated size.
Example: With regard to the disk array with the number of RANKs:10 and LDs:160, the size of
A = 80 + 10 16 + 160 4 = 880
The size of the log file (byte) = 80 + 880 ((30
Furthermore, an index file (file name :OPTDFASTF) that manages the performance optimizing
log file is also created in the same directory as the performance optimizing log file.
File name = OPTDFASTF
The size of the index file (byte) = 80 + (240 + Number of RANKs
disk arrays 2
Example: Number of RANKs:10, disk arrays: the size of 3 cabinets
Estimating Size of NEC
Storage PerformanceOptimizer
Files
16 + Number of LDs
and summing up the individual values of all the RANKs
b 0:i = 4 - b
b = 0:i = 0
the performance optimizing log file obtained by accumulating statistic information for
thirty days based on the logging Interval time of 30 minutes
The size of the index file (byte) = 80 + (240 + 10 16) 3 2 = 2,480 (byte)
50
4 + m
÷4) is a and the remainder is b,
24 60) 30) = 1,267,280 (byte)
16) Number of target