Re: Backups on raw devices

How would this be any different than reading a file system when write activity is taking place? It doesn't matter if it's the OS or Oracle managing the disk, block can and will be split during a hot backup.

I think your sysadmins need to reconsider.

And if I'm all wet on this, someone will be sure to tell me. :)

Jared

On Friday 15 June 2001 12:37, Jenkins, Michael wrote:
> We have parallel server running on on a Sun Cluster 2.2 and we are looking
> for the easiest way to perform hot backups. Now, I know that you have to
> use the "dd" command and skip the header at the beginning. Everything I
> read on metalink indicates that you can use basically the same paradigm as
> a hot backup on cooked file systems. But, the sysadmins here tell me that
> the raw device can't be backed up if there is any write activity on the
> data file that is currently being backed up. Now we all know that contrary
> to popular belief there is write activity on a data file even when the
> tablespace is in backup mode. Is "rman" or some other block-level backup
> utility the only way to get a reliable hot backup on raw devices? Does
> anybody have any experience with hot backups that are made while the
> database still has active users logged in?
>
> I look forward to everyone's thought on this.
>
> Thanks.
>
> Michael L. Jenkins
> Oracle Certified DBA
> Nextel Communications
> Norcross, GA

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