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Source: VCADAA file at the DETAIL timespan
VCA_VS file at the DETAIL timespan
Function: Provide simple descriptive statistics for both Age
and Allocated Space (data set size) for each
cluster. This helps determine the general size
and shape of individual clusters, and can
additionally help identify the presence of
outliers.
Features: This report consists of what is commonly called a
"five number summary" of both Age and Data Set
Size as opposed to the often used mean and
standard deviation measures. This approach was
chosen because it is less affected by non-normal
statistical distributions of the input data values
and is typically used in engineering applications
for that very reason. Aside from the descriptive
statistics, the total number of data sets and
allocated space is given to quantify the affect of
the cluster with respect to the total population,
and a set of weighted allocation measurements is
provided as an alternative metric.
SMS N/A
Issues:
COLUMN DESCRIPTIONS
Cluster
The number of the cluster, from one to n, assigned
by the clustering application.
Number of Datasets
The number of data sets within the cluster.
Age (in days) Statistical Summary
The Age is the time in days since the last
reference of the data set being processed. It is
computed by subtracting the last reference date
from the current date. If the result is missing,
then the same calculation is attempted using the
data set creation date. Observations that still
have missing values after both attempts are
deleted. The Age values are displayed as Minimum,
1st Quartile (25th pctl.), median, 3rd Quartile
(75th pctl.) and Maximum.
Allocated Space (size) in Megabytes
This measurement is derived from element DAAALLSP
and presented as Minimum, 1st Quartile (25th
pctl.), median, 3rd Quartile (75th pctl.),
Maximum, and total values. This total size
depicts how much allocated space is represented by
the cluster.
Weighted Allocated Space
The allocated space of each data set is first
weighted by its calculated Age and then
accumulated together within each cluster. The
accumulated measurements for each cluster are then
presented both as an Average (mean) and Total
values. This is done to quantify the effect of
the size and ages of all data sets taken together
and provides a simple method to understand where
the "pain" is. The expression "pain" refers to
the potential impact one set of data sets might
have on the installation as a whole. For example,
a cluster representing a group of poorly managed
data sets might consist of many small data sets
that are fairly new, and therefore cause minimal
"pain." Conversely, a group of rather large data
sets that are old can easily result in a large
impact on the installation.
SMS CLASS USAGE (STGELE) 4 CA MICS StorageMate AFTER COMPLEX SAS V8.2 Descriptive Statistics for Age & Dataset Size Report Date: 06/25/2004 ------------------------------------------------------------------------------------------------------------------------------------ | | | Age (Days) | Allocated Space (MB) | Wgtd. Alloc. Space | | | |---------------------------------------+-------------------------------------------------| (MB) | | | No. of | | 1st | | 3rd | | | 1st | | 3rd | | |----------------------| | |Datasets|Minimum| Qrtl. |Median | Qrtl. |Maximum|Minimum| Qrtl |Median | Qrtl. |Maximum| Total | Average | Total | |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |Cluster | | | | | | | | | | | | | | | |--------| | | | | | | | | | | | | | | |1 | 29,480| 20| 23| 35| 97| 372| 0| 0| 1| 2| 16| 48,349| 104| 3,074,114| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |2 | 9,258| 289| 401| 484| 617| 865| 0| 0| 0| 1| 17| 7,283| 412| 3,813,085| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |3 | 3,150| 863| 997| 1,172| 1,380| 1,903| 0| 0| 0| 1| 22| 3,576| 1,346| 4,241,299| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |4 | 1,656| 20| 22| 31| 107| 2,052| 16| 20| 27| 41| 61| 50,573| 3,945| 6,532,345| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |5 | 500| 21| 23| 31| 90| 2,030| 62| 76| 85| 108| 156| 46,633| 10,554| 5,276,859| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |6 | 698| 1,910| 2,145| 2,486| 2,796| 6,935| 0| 0| 0| 1| 28| 534| 1,978| 1,380,403| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |7 | 205| 21| 22| 31| 56| 2,380| 160| 172| 212| 255| 325| 45,483| 20,271| 4,155,606| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |8 | 104| 21| 21| 28| 37| 967| 330| 357| 425| 486| 640| 44,878| 36,830| 3,830,367| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |9 | 4| 21| 22| 26| 48| 66| 2,628| 2,716| 2,963| 3,168| 3,216| 11,770| 99,406| 397,622| |--------+--------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+---------+---------+------------| |10 | 29| 21| 22| 30| 253| 1,127| 680| 765| 827| 907| 1,700| 25,714| 214,216| 6,212,277| ------------------------------------------------------------------------------------------------------------------------------------
Figure 4-59A SMS Class Usage / Descriptive Statistics
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