🚀 go-pugleaf

It's been years since I looked at this, so there may be errors here, but as
you're not getting a lot of response...
*BLKIO works on normal VM minidisks; R/O or R/W access is controlled by the CP
directory and/or link command. Any locking protocols must be supplied by the
users. The easiest way of formatting the mdisks is with CMS FORMAT -- you have
a choice of 512, 1024, 2048, or 4096 byte blocks. I can't remember, but I think
the label is in whatever block size you choose, not 80 bytes. In any case, the
relative record order should be respected. You can't use negative offsets.
*BLKIO was designed to allow SQL to run with some semblance of performance.
Normally, after the disk is formatted, the RESERVE command is used to create a
single mode 6 file which contains all of the blocks not used for labels or CMS
file directory. The HELP file for the RESERVE command contains a good descrip-
tion of the layout of the physical blocks.