Milan Babuskov skriver:

> Kjell Rilbe wrote:
> > So what is technically the difference between shadow files and
> > replication, apart from the fact that shadowing is built into FB while
> > replication requires a third-party tool?
>
> Replication can run across network. Replication can be ad-hoc so it does
> not hog the system resources of the main server.

OK, so:

- Shadow must be on local machine while replication can be on different
server, accessible via network.

- Shadow is always kept up to date for each committed transaction while
replication can be executed according to whatever schedule or principle
the replication software provides, including, if supported, for each
committed transaction (like shadow).

So, shadowing can protect against a disk crash but not against damage to
the server as a whole (all disks)?

In that case, for backup purposes, shadowing seems to add nothing over a
raid 1 setup, while replication to a different server would add extra
security.

Did I get this right?

Kjell
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Kjell Rilbe
DataDIA AB
E-post: kjell.rilbe@...
Telefon: 08-761 06 55
Mobil: 0733-44 24 64


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