The question mark column is the number of disk blocks allocated
to the file. One block can be either 512 bytes (very rare), 1k, 2k or
4k. Nowadays most disks are formatted with 4k blocks, but the
default used to be 1k and I'll bet that there are still a number of
1k minidisks around. Likewise, if you have FBA units (they are
obsolete except as emulation on the P/390), 1k or 2k are more
likely than 4k. Anyway, if you multiply the number of blocks by
4096, you will have a much closer estimate of the file size than
by multiplying the LRECL by the number of records. The reason
the exact number of bytes is not shown is that it is not really
relevant on VM, where files are structured. For space allocation
purposes, what you really need to know (be it on VM or on other
systems) is the number of disk blocks actually used by the file.
For instance, a 2M NTFS compressed file under NT could take
up 2M of disk space or just one block, and the number of bytes
does not tell you how much space it is using up.

  Eric