This is GREAT information, thanks much!
> Being that TSM does incremental, your de-dupe ratio will be lower than > other Full / Incr backup products. Here's a few lessons learned with TSM > and a Diligent Protectier. > > 1) Do the best you can to put like data together. (ie all Oracle > DB Backups go to the same de-dupe VirtualTape head (Repository), > > 2) Turn off all compression (Client and DB's) > > 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) > > 4) Do not Mix Windows and Unix data, It wont de-dupe well. > > We are seeing 10 and 15:1 on our Oracle and DB2, Exchange 12:1 (The DB's > and Exchange all do Daily Full Backups) In the regular Win env, we see > 1.45 and 2:1 ick... > > Hope this helps. > > Regards, > > Charles > > > > > > Dirk Kastens <[EMAIL PROTECTED]> > Sent by: "ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> > 08/27/2007 02:31 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 > > > > > > > Hi, > >> Writing a de-dupe backup product isn't easy. EMC bought Avamar and >> Symantec bought Data Center Technologies to get their respective >> products. I don't know of any other de-dupe companies for IBM to >> acquire, so they'll have to write their own. That may take them a bit >> longer. > > We're just testing a deduplication disk array from DataDomain with TSM. > The compression ratio is much less than promised by the sales people. > During the last 10 days of incremental backups we only achieved a ratio > of 2.6:1. The disk array is very expensive and for the money you can buy > more disks than you need without compression. > > -- > Regards, > > Dirk Kastens > Universitaet Osnabrueck, Rechenzentrum (Computer Center) > Albrechtstr. 28, 49069 Osnabrueck, Germany > Tel.: +49-541-969-2347, FAX: -2470 > > > > 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. >
