On Wed, Oct 16, 2019 at 09:32:50PM +0000, Jonathan Buzzard wrote: > On 15/10/2019 16:41, Simon Thompson wrote: > > I thought Spectrum Protect didn't actually backup again on a file > > owner change. Sure mmbackup considers it, but I think Protect just > > updates the metadata. There are also some other options for dsmc that > > can stop other similar issues if you change ctime maybe. > > > > (Other backup tools are available) > > > > It certainly used too. I spent six months carefully chown'ing files one > user at a time so as not to overwhelm the backup, because the first > group I did meant no backup for about a week... > > I have not kept a close eye on it and have just worked on the assumption > for the last decade of "don't do that". If it is no longer the case I > apologize for spreading incorrect information.
TSM can store some amount of metadata in its database without spilling over to a storage pool, so whether a metadata update is cheap or expensive depends not just on ACLs/extended attributes but also the directory entry name length. It can definitely make for some seemingly non-deterministic backup behavior. -- -- Skylar Thompson (skyl...@u.washington.edu) -- Genome Sciences Department, System Administrator -- Foege Building S046, (206)-685-7354 -- University of Washington School of Medicine _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss