[Bug 276522] Setting LUN block size in ctl.conf to 4K causes mismatched block size and crashes in initiators

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276522

--- Comment #1 from balchen@ste.no ---
Having researched some more, I found this from
https://manpages.ubuntu.com/manpages/xenial/en/man8/sg_format.8.html -- the
documentation for the sg_format command:

       When this utility is used without options (i.e. it is only given  a 
DEVICE  argument)  it
       prints  out  the  existing  block size and block count derived from two
sources. These two
       sources are a block descriptor in the response to a MODE SENSE command
and the response to
       a  READ CAPACITY command. The reason for this double check is to detect
a "format corrupt"
       state (see NOTES section). This usage will not modify the disk.

This describes my scenario perfectly, including the "format corrupt" message
which also appears in the ESXi logs.

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