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Required Control Blocks

VLS uses some blocks for its indices and other control information. For the old 2-byte block numbering format, if you are using the default 4000-byte blocksize or specify a blocksize larger than 4000 bytes, eight (8) blocks are used. If you specify a blocksize smaller than 4000 bytes, 14 blocks are used. For the new 4-byte block numbering format, the number of blocks depends on the blocksize and the library size but a minimum of four (4) blocks is required.