W dniu 2017-03-17 o 22:03, Paul Gilmartin pisze:
On 2017-03-17, at 14:44, Jesse 1 Robinson wrote:
By 'compress', I mean plain old IEBCOPY to squeeze out the gas left by deleted
members. I realize after my previous post that I now routinely create SMPPTS%
as PDSE, so compression is not an option. Back when multiple SMPPTS% became
available, SMPE/E would try to compress every PTS% that got x37. Every time.
The only thing wrong with that is the churn in I/O and CPU plus SYSPRINT lines
trying futilely on every RECEIVE to compress a full PDS. The SMP/E OPTIONS
entry allows for list of exceptions for RECOVERY, but I don't have any DDDEFs
listed there.
Oh. That COMPRESS.
Not harmful except for being wasteful. That may be a reason that
SMP/E recommends allocating SMPPTS as PDSE.
IMHO the main reason is size restriction. PDS - 64k TRK (~3GB), PDSE -
full volume (up to 1 TB nowadays).
--
Radoslaw Skorupka
Lodz, Poland
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