It would be helpful if snapdiff backups updated the BACKUP_START field, even if we have to resign ourselves to nothing recorded as BACKUP_END. Is there a reason why that can't be done? - Margaret Clark
-----Original Message----- From: ADSM: Dist Stor Manager [mailto:[email protected]] On Behalf Of Pete Tanenhaus Sent: Tuesday, February 14, 2012 10:09 AM To: [email protected] Subject: Re: [ADSM-L] Need some support for snapdiff RFE's Actually this really isn't correct, a snapshot differential backup will detect deleted files and will expire them on the TSM server. Periodic full progressive incremental backups are recommended because "less complete" backups such as snapdiff, incremental by date, and JBB can never be as comprehensive as a full progressive given that a full progressive examines every file on the local file system and every file in the TSM server inventory. Note that "less complete" implies that changes processed by a full progressive might be missed by other "less complete" backup methods, and this is the reasoning behind recommending periodic full progressive incrementals. JBB is somewhat better in that in makes every attempt to detect conditions which indicate that the change journal is out of sync with what has previously been backed up and to automatically force the full progressive incremental backup instead of requiring the user to manually schedule it. For reasons that require a very detailed explanation (let me know if you are interested), the current snapdiff implementation doesn't have the robustness or resiliency that JBB does and therefore really requires manually scheduling full progressive incremental backups via the CreateNewBase option. Hope this helps ... Pete Tanenhaus Tivoli Storage Manager Client Development email: [email protected] tieline: 320.8778, external: 607.754.4213 "Those who refuse to challenge authority are condemned to conform to it" |------------> | From: | |------------> >--------------------------------------------------------------------------------------------------------------------------------------------------| |Paul Zarnowski <[email protected]> | >--------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | To: | |------------> >--------------------------------------------------------------------------------------------------------------------------------------------------| |[email protected] | >--------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | Date: | |------------> >--------------------------------------------------------------------------------------------------------------------------------------------------| |02/14/2012 07:12 AM | >--------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | Subject: | |------------> >--------------------------------------------------------------------------------------------------------------------------------------------------| |Re: Need some support for snapdiff RFE's | >--------------------------------------------------------------------------------------------------------------------------------------------------| |------------> | Sent by: | |------------> >--------------------------------------------------------------------------------------------------------------------------------------------------| |"ADSM: Dist Stor Manager" <[email protected]> | >--------------------------------------------------------------------------------------------------------------------------------------------------| Grant, The time stamps are not updated, because a snapdiff incremental does not deactivate deleted files. You need to do periodic 'createnewbase' to do this, which walks the file system and updates the time stamps. ..Paul On Feb 14, 2012, at 12:32 AM, "Grant Street" <[email protected]> wrote: > Hello > > Just thought I would plug two snapdiff RFE's(Request For Enhancement) > that I created on the IBM developer works site. > > I am trying to garner some support for these in the hope that they > will be implemented in the future. > > I have seen that some of you have had experience with Netapp snapdiff > backups and you may have similar beliefs. > > "Define snapdiff and other snap options on a per filesystem basis > rather than per backup command" > When running an incremental backup be able to define the snapdiff or > other snap option on a per filesystem basis rather than for the whole > backup incremental job. > > http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=12858 > > "Snapdiff to update last backup fields in filespace data" > Could you please update the TSM snapdiff client to update the > lastbackup information of filespaces when a "query filespace f=d" is > issued. This would be the obvious behaviour and would be inline with > the documented meaning of the columns > > http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=13145 > > TIA > > Grant
