Any problem with mixed DCC versions?

Vernon Schryver
Sat Mar 29 20:07:29 UTC 2008

> From: Gary Mills <>

> I probably don't even need to ask this, but I like to be careful.

I believe in upward compatibility.

> I just upgraded a test server from dcc-1.3.48 to dcc-1.3.86.  On
> startup, DCC noticed version mismatches and automatically upgraded
> the necessary databases.  These messages appeared:
>     Mar 29 12:36:53 setup01 dccd[15877]: [ID 702911 mail.error] dcc_db contains the wrong magic string "DCC checksum database version 3"

and so dccd ran dbclean to fix things.

>     Mar 29 12:36:56 setup01 dbclean[15879]: [ID 702911 mail.error] wrong magic in; "DCC flod map version 10" instead of "DCC flod map version 14"

and so dbclean rebuilt /var/dcc/ file from /var/dcc/flod.

> It all worked normally after that.  For production, I have two DCC
> servers with flood feeds to each other and to external sites that both
> run dcc-1.3.48.  Can I upgrade one to dcc-1.3.86 and leave the other
> one at the old version for some time?  I assume that this is all
> possible.


The only oddity you might see is that new DCC clients (systems
running dccm, dccifd, or dccproc) will prefer, but not insist on
the new DCC server.

Vernon Schryver

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