Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!wuarchive!decwrl!ucbvax!NUSDISCS.BITNET!CHAIBP
From: CHAIBP@NUSDISCS.BITNET
Newsgroups: comp.protocols.iso.dev-environ
Subject: CCR queries
Message-ID: <8911280850.AA21135@ucbvax.Berkeley.EDU>
Date: 28 Nov 89 23:08:00 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Distribution: inet
Organization: The Internet
Lines: 40



Alistair Munro,

Thanks for your reply. I couldn't reach you via gateway mail so
I send to this mailing list. Is the following address correct ?
   MunroAT%np1a.bristol.ac.uk@NFSnet-Relay.AC.UK

Anyway, I have the following queries related to CCR :

1. Since CCR is not included in ISODE, how can Service Elements
   in the application layer - eg. FTAM, provide reliable application-
   oriented information transfer over an arbitrary network ?
   Using a reliable class-4 Transport doesn't help. Take for instance,
   in the midst of a file transfer there is an application failure -
   the application programs hang due to memory corruption. But the
   the communication subsystem - TP-4, which is residing on a special
   networking card is not affected. In this case, since the failure
   occurs above transport layer, it is of course not transport layer's
   responsibility to recovery. The application has to be capable of
   recovering itself. But without CCR, how can be this be done ?

2. CCR services are made possible only with the use of secure data. If
   secure data is lost, CCR services will breakdown. What machanisms
   can be used to ensure that secure data is never lost with whatever
   possible kinds of failure - disk crash, power failure, system breakdown,
   etc. In mainframe/mini systems, this is most commonly done using
   mirror disks, but there seems to be no equaly good solutions in
   workstations or microcomputers. What's your solution ?

3. With the C_BEGIN parameter list, there is the "branch identifier"
   which is used to uniquely identify a branch with an atomic action
   tree. It is mentioned in the spec. that this parameter should be
   carried by CASE Kernel. What's "CASE Kernel" ? CASE is defined to
   composed of ASCE, ROSE and CCR. Does CASE Kernel refers to any
   of these ? If not, what then ?

Any info would be greatly appreciated.

B. P. Chai


Brought to you by Super Global Mega Corp .com