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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Author: Jenkins, Michael
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