> Tom Ehlert <t...@drivesnapshot.de> wrote:
>> try using MSDOS or linux (or even Windows) for the
>> 'server' machine, and see if the problema go away
> I did the test with MS-DOS in the server and FreeDOS in the
> client.
> The problem vanished.
> I even used "MODE con rate=32" which is the fastest typematic
> rate, and kept the arrow keys and PgUp/PgDn pressed in both
> computers for about a minute. The system is completely stable.
then the problem is not related to SHARE, but most likely a kernel
problem.
SHARE is responsible to resolve conflicts around multiple *write*
requests to the same file. just scrolling through a database should
work with or without locking.
but: in this case the remote machine and the local one (the 'server')
ascess the file at the same time, with a decent probability that the
server machine is inside DOS, when the read request from the remote
machine arrives. if this is not handled properly, you get a lot of
interesting (seemingly random) error messages as reported in you
initial post
From the server:
- "General failure reading drive C"
- "Disk is write protected"
From the client:
- "Not ready reading drive G"
- (This one is from DataPerfect, in a rare instance when the
client did not crash along with the server:) "Network
error. One or more of the database files can't be accessed
because of the current authorization for the files [..]"
this is the black art of reliable disk access from a TSR (MSCLIENT),
along InDOS flag, SDA, possibly some internal calls, ...
most likely FreeDOS Kernel behaves just a tiny bit different from
MSDOS, and 'multitasking' on top of FreeDOS goes wrong.
btw: this could also affect different network stacks, because the
problem would be similar.
conclusion: don't use FreeDOS as a 'server' machine.
Tom
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