As far as I know client site de-duplication will not work with primary storage pool DISK. It must be FILE as well like for server site de-duplication. Am I right?
Grigori G. Solonovitch -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Roger Deschner Sent: Wednesday, June 22, 2011 9:37 AM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Deduplication and Collocation Back to client side dedupe, which we're about to deploy for a branch campus 90 miles away in Rockford IL. The data is sent from the clients in Rockford via tin cans and string to the TSM server in Chicago already dedpued. We're using source dedupe because the network bandwidth is somewhat limited. So if it is received into a DEVCLASS DISK stgpool, then I assume it is still deduped, because that's how it arrived. Then finally when it's migrated to tape, we've already established that it gets reinflated, and then you can collocate or not as you wish. But the question is, does this imply that deduped data CAN exist in random access DEVCLASS DISK stgpools if client-side dedupe is being used? I sure hope so, because that's what we're planning to do. Roger Deschner University of Illinois at Chicago rog...@uic.edu ========== "You will finish your project ahead of schedule." =========== ================= (Best fortune-cookie fortune ever.) ================== On Tue, 21 Jun 2011, Paul Zarnowski wrote: >Even if a FILE devclass has dedup turned on, when the data is migrated, >reclaimed, or backed up (backup stgpool) to tape, then the files are >reconstructed from their pieces. > >You cannot dedup on DISK stgpools. >DISK implies "random access disk" - e.g., devclass DISK. >FILE implies "serial access disk - e.g., devclass FILE. > >But I think there is still an open question about collocation and >deduplication. Deduplication must be done using FILE stgpools, but FILE >stgpools CAN use collocation. I don't know what happens in this case. > >..Paul > >At 02:38 PM 6/21/2011, Prather, Wanda wrote: >>If it is a file device class with dedup turned off, yes. >> >>-----Original Message----- >>From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Mark >>Mooney >>Sent: Tuesday, June 21, 2011 2:29 PM >>To: ADSM-L@VM.MARIST.EDU >>Subject: Re: [ADSM-L] Deduplication and Collocation >> >>So data is deduplicated in a disk storage pool but when it is written to tape >>the entire reconstructed file is written out? Is this the same for file >>device classes? >> > > >-- >Paul Zarnowski Ph: 607-255-4757 >Manager, Storage Services Fx: 607-255-8521 >719 Rhodes Hall, Ithaca, NY 14853-3801 Em: p...@cornell.edu > Please consider the environment before printing this Email. CONFIDENTIALITY AND WAIVER: The information contained in this electronic mail message and any attachments hereto may be legally privileged and confidential. The information is intended only for the recipient(s) named in this message. If you are not the intended recipient you are notified that any use, disclosure, copying or distribution is prohibited. If you have received this in error please contact the sender and delete this message and any attachments from your computer system. We do not guarantee that this message or any attachment to it is secure or free from errors, computer viruses or other conditions that may damage or interfere with data, hardware or software.