I'd expect better performance from ESDS or RSDS than from EXCP.
Not in our experience. We've tried all possible forms of I/O and LDS was
certainly the best when it comes to VSAM. zFS is implemented as VSAM LDS
files and I assume that they know what they are doing. from recollectin
ESDS and RRDS performance wasn't great by comparison, so we dropped that
exploration farily early on.
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