John, I now place the vtoc, vtoc index and vvds at the beginning of the logical volume. I size the vtoc and vvds based on the expected number of datasets that will be allocated to the volume. The size of the index is based on the size of the vtoc. The only reason that I place all together at the beginning is to avoid creating a fragment that may never be used. There is no performance penalty (or gain) for starting the vtoc at a certain cylinder address since we now deal with are emulated devices. Regards, John
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