The WXX should normally be allocated as a very small data set, because it only needs space for outstanding RRM two-phase commits. The space needed can be calculated as follows.
The WXX block size is 4096. The first block is reserved as a control block. Each block has a 32 byte header. Following the header are 96 byte rows, one each per unique outstanding two-phase commit per remote MUF. Each WXX block can contain 42 of these rows.
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