Any idea why Diligent's dedup ratio is better? What's different about the dedup algorithm that makes it work better?
At 06:29 PM 8/28/2007, Curtis Preston wrote:
That sounds about right. Data Domain's a good product with a lot of happy customers, but TSM customers who are only backing up files and only keeping 3 versions aren't going to be among them. ;) You've got to backup database/app/email type data that does recurring full backups and/or keep a whole lot more than 3 versions to have de-dupe make sense for you. That's not a Data Domain thing. That's just how de-dupe works. In addition, it won't work if you use it as you would normally use a disk pool (1-2 days of backups and then move to tape). There won't be anything to de-dupe against, and you'll get close to nothing. You need to leave your onsite backups permanently on it for de-dupe to work. --- W. Curtis Preston Backup Blog @ www.backupcentral.com VP Data Protection, GlassHouse Technologies -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Dirk Kastens Sent: Tuesday, August 28, 2007 9:18 AM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Data Deduplication Hi, Jon Evans wrote: > Dirk > > I also tried Data Domain and was not impressed. I now use Diligent's > Protectier and its far more impressive. Its scalable, reasonably priced, > achieves throughput of 200mb per second and better and factoring ratio's > of > Over 10 to 1 We mainly backup normal files and only use 3 backup versions so that the compression will not be more than 3:1 or 5:1. The best results can be achieved with databases and application data like Exchange. That's what the people from DataDomain said. I'm just running another test with MySQL and Domino data. Let's wait and see :-) -- Regards, Dirk Kastens Universitaet Osnabrueck, Rechenzentrum (Computer Center) Albrechtstr. 28, 49069 Osnabrueck, Germany Tel.: +49-541-969-2347, FAX: -2470
-- Paul Zarnowski Ph: 607-255-4757 Manager, Storage Services Fx: 607-255-8521 719 Rhodes Hall, Ithaca, NY 14853-3801 Em: [EMAIL PROTECTED]
