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The Compression Recommendation Report is similar to the
Compression Candidacy Report discussed in the prior section.
The Recommendation report presents its output by timespan
and in three sections:
o the detail for each timespan, including the Percent
savings limit specified field, which reflects the percent
saving lower limit you entered on the panel, and the
Match Limit field, which contains one of the following:
YES if the file achieves at least your specified
savings limit
NOTSUP if the file does not support compression
NEVER if the file must not be compressed
(blank) if the file does not achieve your specified
savings limit
o the allocation summary, including an additional
recommended allocation block which is described below
o the table of percent savings limits and their estimated
DASD savings
A sample of the allocation summary section of the report
follows.
Compression Recommendation Report --------------------------------- CA MICS complex name: MDI.DIA6100-COMPRESSION COMPLEX Timespan: DETAIL Libref: PDETAIL Date: 28APR00 Page 5 Percent savings limit specified: 0.10 % Total uncompressed file space: 1318.7339 All space values are in M/bytes. ===========================Allocation Summary=========================== |Current Library: | | | | Data set name: MDI.DIA6100P.DETAIL | | | | Total space allocated | 1548.7559 | 1548.7559 | (Current Allocation) | Uncompressed file space | 360.0967 | | | | Compressed file space |+ 523.3359 | | | | Overhead space |+ 3.9551 | | | | |------------| | | | Minimum space used |= 887.3877 |- 887.3877 | | | ============|------------| | | Free space in library |= 661.3682 | | | Highest used space |- 121.9219 | | | |------------| | | Allocated space never used (future use) |= 539.4463 | | | ============| | | | | |---------------------------------------------------------| | | | | |Recommendation: Compress 21 files. | | | | | | Est. uncompressed file space | 172.2568 | | | | Est. compressed file space |+ 676.6727 | | | | Same amount overhead space |+ 3.9551 | | | | |------------| | | | Estimated minimum space |= 852.8846 | 852.8846 | | | ============| | | | Same amount free space in library |+ 661.3682 | | | |------------| | | Estimated maximum space required |= 1514.2528 |- 1514.2528 | (New Allocation) | ============|------------| | Estimated allocation saving/increase |= 34.5031 | (Saving) | Estimated percent change in allocation | 2.23 % | ========================================================================
The fields in the Current Library section are identical to
the fields in the Compression Candidacy Report. The new
section, Recommendation, includes the following fields:
Recommendation: the number of files you should compress to
Compress nn achieve your desired savings. This is the
files number of files that matched your limit.
Est. the estimated amount of space that would be
uncompressed occupied by all of the cycle files whose
file space percent change values were less than your
specified value.
Est. the estimated amount of space that would be
compressed occupied by all of the cycle files whose
file space percent change values were greater than or
equal to your specified value.
Same amount the amount of space that is currently
overhead space consumed for overhead.
Estimated the sum of the estimated uncompressed and
minimum space compressed file space and overhead.
Same amount the amount of free space that exists in the
free space in current data set's allocation.
library
Estimated the sum of the estimated maximum space and
maximum space free space. This is the amount of space to
required allocate if you choose to allocate new
libraries when you implement compression.
Estimated the difference between the current allocation
allocation and the new allocation. A negative number
saving/increase denotes a size increase.
Estimated the quotient of the new allocation and the
percent change current allocation, expressed as a
in allocation percentage. A negative percentage means that
the new allocation is larger than the current
allocation.
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