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Re: shared disk (DOS)

From: Tomas By
Subject: Re: shared disk (DOS)
Date: Tue, 13 Apr 2021 10:39:00 +0200
User-agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (Gojō) APEL/10.8 EasyPG/1.0.0 Emacs/26 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO)

Maybe it's a language problem. "sharing disk" and "network file
system" are the same thing here.

Trying to physically connect the same disk to two computers sounds

Is there some way to emulate "network file system" access from two (or
more) separate QEMU instances to the same disk image?

Which format for the image?


On Tue, 13 Apr 2021 08:45:07 +0200, Jakob Bohm wrote:
> You still misunderstand SHARE.EXE (a DOS only thing).  SHARE.exe makes 
> DOS handle file locking calls (which cc:mail may happen to use for 
> something).  It does nothing for sharing disks.
> With network file systems such as SMB and/or NFS, SHARE.exe may also 
> provide some of the glue needed for file locking calls from programs 
> (like cc:mail) to reach the file server (which will have code to 
> handle locking from multiple DOS machines accessing the same file).
> In general, you should treat qemu virtual machines almost like real 
> machines.  Wiring multiple machines to access a single physical disk 
> will involve use of SCSI cables coming out the back of the computer and 
> connected to a single physical disk.  This has always been an exotic 
> thing to do, and it was never supported by DOS.

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