So why do you need to downgrade? Is it due to some technical issue, or is it a case where you are running with an incompatible server? If there is a technical issue you should contact IBM support before giving up on 6.1 or 6.2.
At any rate: No, you cannot simply uninstall the 6.x client and reinstall the 5.5 client and expect it to work okay. This will most likely cause problems not only with restore, but with backup as well (active metadata is at 6.1 level, which 5.5 client does not understand). If you are in a position where there is no choice but to downgrade, then I suggest you rename the existing node to something else, then create a new node with the same name as the original node. Thus the next backup will be a complete backup of everything. But if you need to access the older data, you can still get to it (the data backed up with 6.x client will need the corresponding 6.x client to restore). You can then delete the old node's file spaces after the new backup file spaces are established. Before deleting old data, be sure to take your policy set retention settings into consideration (verexists, verdeleted, retextra, retonly) so you do not delete data prematurely. If this is especially critical data, proceed with caution and contact IBM support for further guidance. Best regards, Andy Andy Raibeck IBM Software Group Tivoli Storage Manager Client Product Development Level 3 Team Lead Internal Notes e-mail: Andrew Raibeck/Hartford/i...@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 The only dumb question is the one that goes unasked. The command line is your friend. "Good enough" is the enemy of excellence. "ADSM: Dist Stor Manager" <ADSM-L@vm.marist.edu> wrote on 2010-09-02 04:24:43: > From: Stefan Folkerts <stefan.folke...@itaa.nl> > To: ADSM-L@vm.marist.edu > Date: 2010-09-02 04:24 > Subject: Downgrading TSM 6.1/6.2 Windows clients to 5.5 > Sent by: "ADSM: Dist Stor Manager" <ADSM-L@vm.marist.edu> > > What are the consequences of downgrading a TSM client from 6.1/6.2 > to 5.5 on Windows? > I expect the systemstate as it was backed-up using the 6.x clients > won't restore but will file/archive restores work? > > Regards, > Stefan