Re: Deduplication question
On 06/09/11 22:40, Richard van Denzel wrote: Hi All, Just a question aboutn the internal dedup of TSM. When I dedup a storage pool and then backup the pool to a dedup copy pool, will the data in the storage pool backup be transferred deduped or will it get undeduped first, then transferred and then dedupped again? Richard. Richard, The chapter 'managing storage pools and volumes' in the TSM 6.1 Admin Guide has a decent section on deduplicating data. We are investigating server- and client-side dedupe but we haven't tried what you want to do in our test environment. However, the above document suggests in two places that the data will be copied/moved in its deduplicated 'state' rather than being rebuilt, copied and deduplicated again. Ian Smith Oxford University
Re: Deduplication question
Hi Richard, No, the deduplicated data is not recomposed when backing up to a deduplicated copy storage pool. Recommended reading: http://www.ibm.com/developerworks/wikis/pages/viewpage.action?pageId=108134649 http://www.ibm.com/developerworks/wikis/display/tivolistoragemanager/Data +deduplication+best+practices+for+Tivoli+Storage+Manager+V6.2 Best regards, Andy Raibeck IBM Software Group Tivoli Storage Manager Client Product Development Level 3 Team Lead Internal Notes e-mail: Andrew Raibeck/Hartford/IBM@IBMUS Internet e-mail: stor...@us.ibm.com IBM Tivoli Storage Manager support web page: http://www.ibm.com/support/entry/portal/Overview/Software/Tivoli/Tivoli_Storage_Manager "ADSM: Dist Stor Manager" wrote on 2011-09-06 17:40:49: > From: Richard van Denzel > To: ADSM-L@vm.marist.edu > Date: 2011-09-06 17:44 > Subject: Deduplication question > Sent by: "ADSM: Dist Stor Manager" > > Hi All, > > Just a question aboutn the internal dedup of TSM. When I dedup a storage > pool and then backup the pool to a dedup copy pool, will the data in the > storage pool backup be transferred deduped or will it get undeduped first, > then transferred and then dedupped again? > > Richard.
Re: Deduplication Question
You're welcome. Been there, done that, got the scars to prove it! ;>) -Original Message- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Jim Neal Sent: Thursday, March 10, 2011 4:44 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Deduplication Question Importance: High Thanks Wanda! That worked perfectly! I owe you one! Jim -Original Message- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Prather, Wanda Sent: Thursday, March 10, 2011 1:20 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Deduplication Question Check the MOUNTLIMIT in the client definition. It controls how many mount points in a sequential pool the client can use at once. -Original Message- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Jim Neal Sent: Thursday, March 10, 2011 4:16 PM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] Deduplication Question Importance: High Hi All, I am testing Deduplication on a Red Hat 5 , 64 Bit, X86 Linux Server, using TSM Server version 6.2.2.2. I set up a storage pool for Deduplication and using a file devclass. When I try to back up a windows client to the storage pool, I am getting an error that says "ANR0525W - Server Media mount not possible". However, when I back up to a standard storage pool with a disk devclass, the same client backs up perfectly and then the data can be migrated to the deduplicated storage pool. My questions are these: 1) Can you back up a client directly to a deduplicated storage pool? If so, how? 2) What criteria should be used for the creation of volumes for a deduplicated storage pool? 3) Is there documentation that specifically says that you have to migrate data to the deduplicated storage pool? Any insight on these issues will be greatly appreciated! Thanks! Jim Neal Sr. TSM Administrator U.C. Berkeley Storage and Backup Group
Re: Deduplication Question
Thanks Wanda! That worked perfectly! I owe you one! Jim -Original Message- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Prather, Wanda Sent: Thursday, March 10, 2011 1:20 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Deduplication Question Check the MOUNTLIMIT in the client definition. It controls how many mount points in a sequential pool the client can use at once. -Original Message- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Jim Neal Sent: Thursday, March 10, 2011 4:16 PM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] Deduplication Question Importance: High Hi All, I am testing Deduplication on a Red Hat 5 , 64 Bit, X86 Linux Server, using TSM Server version 6.2.2.2. I set up a storage pool for Deduplication and using a file devclass. When I try to back up a windows client to the storage pool, I am getting an error that says "ANR0525W - Server Media mount not possible". However, when I back up to a standard storage pool with a disk devclass, the same client backs up perfectly and then the data can be migrated to the deduplicated storage pool. My questions are these: 1) Can you back up a client directly to a deduplicated storage pool? If so, how? 2) What criteria should be used for the creation of volumes for a deduplicated storage pool? 3) Is there documentation that specifically says that you have to migrate data to the deduplicated storage pool? Any insight on these issues will be greatly appreciated! Thanks! Jim Neal Sr. TSM Administrator U.C. Berkeley Storage and Backup Group
Re: Deduplication Question
Check the MOUNTLIMIT in the client definition. It controls how many mount points in a sequential pool the client can use at once. -Original Message- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Jim Neal Sent: Thursday, March 10, 2011 4:16 PM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] Deduplication Question Importance: High Hi All, I am testing Deduplication on a Red Hat 5 , 64 Bit, X86 Linux Server, using TSM Server version 6.2.2.2. I set up a storage pool for Deduplication and using a file devclass. When I try to back up a windows client to the storage pool, I am getting an error that says "ANR0525W - Server Media mount not possible". However, when I back up to a standard storage pool with a disk devclass, the same client backs up perfectly and then the data can be migrated to the deduplicated storage pool. My questions are these: 1) Can you back up a client directly to a deduplicated storage pool? If so, how? 2) What criteria should be used for the creation of volumes for a deduplicated storage pool? 3) Is there documentation that specifically says that you have to migrate data to the deduplicated storage pool? Any insight on these issues will be greatly appreciated! Thanks! Jim Neal Sr. TSM Administrator U.C. Berkeley Storage and Backup Group
