According to Dilligent, when RMAN uses Multiplexing, it intermingles the data from each RMAN so the data block will be different every time so the blocks are different, similar to Multiplexing with Netbackup... I'm not an RMAN expert, just trusting what the Vendor is stating.
The following link seems to match with what we are being told http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmconc1002.htm (Look for the Multiplex Section) Is there an RMAn expert in the house? Can some one confirm this info? Charles Hart UHT - Data Protection (763)744-2263 Sharepoint: http://unitedteams.uhc.com/uht/EnterpriseStorage/DataProtection/default.aspx Curtis Preston <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> 08/27/2007 11:40 AM Please respond to "ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> To ADSM-L@VM.MARIST.EDU cc Subject Re: [ADSM-L] Data Deduplication > 3) Oracle Specific > Do not use RMAN's Multiplexing in RMAN will combine 4 >Channels together and the backup data then will be unique every time thus >not allowing for de-duping) > Use the File Seq=1 (Then run multiple channels) I don't see how this would affect de-duplication if your de-dupe product knows what it's doing. Every block coming into the device should be compared to every other block ever seen by the device. So combining multiple files together using Oracle multiplexing shouldn't affect de-dupe. Did you test this, or see it in the docs somewhere? Was this true for multiple de-dupe vendors, or just the one you chose? This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. If the reader of this e-mail is not the intended recipient or his or her authorized agent, the reader is hereby notified that any dissemination, distribution or copying of this e-mail is prohibited. If you have received this e-mail in error, please notify the sender by replying to this message and delete this e-mail immediately.
