Re: DDM Setup...

Most of the weaker points you bring up are directly related to TCP/IP
and not DDM. Using a SDLC link requires none of the functions you refer
to. I have never see or heard of a DDM client, since DDM has existed
for at "least" the last 17 years and maybe before that. I first used
DDM on a pair of S/36's in 1983.


thomas@inorbit.com wrote:
>
> Tim:
>
> On Thu, 25 October 2001, "Hatzenbeler, Tim" wrote:
>
> > DDM (my experience level is, never seen it, never used it)  But I think it
> > allows you to share a files between box's real time...  If that's the
> > case...
> >
> > What would I need to do on each box, to allow the sharing of a file called
> > [timtest] in a library called [devtimh]  both machines are connected via
> > tcp/ip
> >
> > Also, can ddm be used to share the same file on more than two as/400?
> > Could I have 12 as/400 writing and sharing the same file between all the
> > boxes?
>
> It's extremely easy. You'll create the DDM file as:
>
>  ÝÝÞ cfgddmf  file( mylocallib/mylocalDDMFname ) +
>               rmtfile( devtimh/timtest ) +
>               rmtlocname( remotehostname *IP )
>
> Note that you can use the local host name in place of remotehostname to set 
>up a test that involves just the local system. And that's about all there is 
>to it. Except...
>
> First, the AS/400 DDM client does not yet support the sending of 
>userid/password. Therefore, unless you want the systems essentially wide open, 
>you'll need to configure the DDM server on the remote system at least to 
>require passwords, and then use server authentication entries for each user on 
>the local system who will be using the file(s). Use CHGDDMTCPA to configure 
>the DDM server and ADDSVRAUTE to add authentication entries. Be aware that 
>server name is case-sensitive and must be QDDMSERVER on the authentication 
>entries. Also be aware that only one entry per user per server is allowed; 
>therefore, the same entry will be referenced no matter how many different 
>remote systems are accessed. Also be aware that the QRETSVRSEC system value 
>must be set to '1ݾtain data' on the local system in order to retain the 
>values in these entries; if the system value is ever changed to '0', the 
>userid/password values are erased from the entries and must be each changed 
>back to correct val!
> ues. And take care with choosing the userid/password for the authentication 
>entries unless you secure against the SBMRMTCMD command on the remote site or 
>have strong object authorities in place.
>
> Second, keep in mind that a DDM file is not considered a database file. 
>Therefore, functions such as Query/400 or SQL will not work. For SQL, you're 
>better off just setting up RDB directory entries on both systems and 
>CONNECTing to the remote database. In fact, you'll maybe want to do that in 
>addition to DDM anyway.
>
> Other than that, it works great.
>
> Tom Liotta
>
> --
> Tom Liotta
> The PowerTech Group, Inc.
> 19426 68th Avenue South
> Kent, WA 98032
> Phone  253-872-7788
> Fax  253-872-7904
> http://www.400Security.com
>
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