Thinking a moment further, I should perhaps expand a bit on this...
So, mounting of tapes are always non-shared (for obvious reasons). So,
if someone mounts a tape, anyone else trying to do anything with that
device is just going to be hanging until the first user is finished with
the tape and dismounts it.
Disks on the other hand can be mounted shared. However, unless mounted
public, each user needs to mount the disk in order to access it. (So
yes, a disk can be mounted multiple times, by multiple users/sessions.)
Now, mounting is actually associated with a logged in session (or more
specifically a terminal). If you mount something, it remains mounted
until you explicitly dismount it, or you log out, at which point it is
forcibly dismounted.
This is basically incompatible with how DAP works, where you basically
access a file for the duration of that connection. And one connection
usually means open a file, do various operations, and then close the
file. So if you copy two files from one system to another, it is two
independent sessions as far as DAP is concerned.
So there is no way to access content on a not-mounted device via DAP.
How would that work? If you were to be able to request a mount, it would
be associated with a logged in session, but in this case that don't
exist (unless we talk about the session on the remote system).
So if you were to mount, at the end of the mount request, there would be
an implicit forced dismount again. If the next thing you wanted to do
was to copy something from the mounted device, it would already have
been dismounted again, and content would no longer be accessible.
Basically, in RSX, you are only able to access content on publicly
mounted devices for this reason.
Johnny
On 2023-04-16 02:01, Johnny Billquist wrote:
Mounting in RSX is pretty much identical to VMS.
And there is no way to mount things over DAP as far as I know. But I'd
be interested in any information related to that.
Johnny
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Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)softjar.se || Reading murder books
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