[Info-vax] Volume shadowing and current SCSI standards ?

[Simon Clubley]

On 2022-04-28, Matthew R. Wilson <mwilson at mattwilson.org> wrote:
>
> Interesting. The wording in the Volume Shadowing Guide seem to imply
> that VMS itself would work with devices that don't support READ/WRITE
> LONG, but you shouldn't use them with Volume Shadowing.
>

[snip]

>
> The READ LONG and WRITE LONG commands have been removed from the latest
> SCSI standard. I wonder if that's why VMS refused to try to work with my
> target when it was reporting that it was a version SPC-5
> implementation... VMS may know the READ/WRITE LONG commands are no
> longer in the standard and so rejects the new version. (Or it may have
> no special knowledge of SPC-5 and later at all, and just plays it safe
> and refuses it because it only knows about SPC-4 and below.)
>

Interesting, because that has serious implications for using VMS with
modern hardware, especially on x86-64, if true.

If this statement is correct, does this mean that VMS volume shadowing
will no longer work with devices which use only the latest SCSI standard ?

If so, I wonder how VSI plan to address this ?

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.