Yes and zEDC poorly compresses internally RLE compressed records.
Plus CSRCESRV uses GP engine cycles, whereas zEDC offloads the
processing and reduces CICS and DB2 address space CPU time, By the
time LOGGER writes the data to the logstream, it is already
compressed and is smaller than the compressed internally compressed.
Ditto for the IFASMFDL logstream unload processing when the output
files are SMS compressed with zEDC,
Michael
At 06:19 PM 4/16/2024, Andrew Rowley wrote:
Content-Transfer-Encoding: 8bit
On 17/04/2024 7:52 am, Michael Oujesky wrote:
My current recommendation is to remove internal compression from
CICS CMF (110/112) and DB2 (100-102) records, Zedc compress the SMF
logstreams, then compress the logstream offloads via SMS zEDC compression.
Have you compared compressed size of zEDC with/without the CICS
compression? I have limited samples, but it looks like zEDC might
compress data better if it has been already been compressed by CICS.
Of course, there is the CPU time to consider.
I think I/O can also be much faster for zEDC compressed data.
--
Andrew Rowley
Black Hill Software
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