Online backup and the Redolog mechanism

Hello,
During a backup I understand that the redolog mechanism changes, so that when a block is changed for the first time after the backup commences, it's entire content is copied to the redolog files, rather than just the change vector.
My question is, does this happen even when the oracle block size is the same as the operating system block size?
My understanding is that the change in redolog mechanism is because a single oracle block can be made up multiple operating system blocks, so that within an oracle block a change can be done to a few blocks, then a read by the online backup, so that the oracle block read by the backup is inconsistent.
But if the oracle block size was the same as the operating system block size, each change would be atomic, so the problem of having inconsistent oracle blocks would not arise. So the change in redolog mechanism would no longer be necessary. Does the redolog mechanism change anyway?
Kind regards,
Peter

Hi Peter,
I will try to make the issue more clear eventhough so much useful has been written and said in this thread !!
During Online Backup the tablespaces enter the backup mode this has following effects:
1) A checkpoint on TS level is triggered before the backup of this TS starts and DBWR writes all corresponding dirty blocks of this TS to data files.
2) The SCN corresponding to TS Checkpoint remains Frozen in the headrers of all TS files until the end of backup mode.
3) Every change in this TS is logged in the redolog on data block level instead of data record level ; not only the redo info for a modified record is written into the redolg but the whole 8 KB block containing this record ( immaterial whether OS block size is 8 KB or not). The reason for this granual logging is the possibility that
CPIO or DD may copy an oracle block to the backup medium in smaller units than 8 KB while the block is being changed by DBWR which can lead to inconsistencies whithin such a block.
Now When the backup later used for restoring the TS, all blocks written to the redo log during the backup mode overwrite therir "suspicious"versions saved directly in the backup of the data files.
Hope this useful
Regards
Umesh

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