Subfile backup on this big a filesystem would probably be... interesting to restore :)
Theres also a 2GB file limit for subfile and with 15TB data I'm guessing that there might be a few files bigger than that. And on Windows I believe that atleast permissions arent restored correctly when using subfile but that is/was? a deficiency in NTFS. But apart from that I guess only the ACL would be backed up... -km On 16/02, Len Boyle wrote: > What happens if you are using subfilebackup. Will it just backup the acl's as > the data blocks have not changed? > > len > > -----Original Message----- > From: ADSM: Dist Stor Manager [mailto:[email protected]] On Behalf Of km > Sent: Monday, February 16, 2009 4:26 PM > To: [email protected] > Subject: Re: [ADSM-L] Backup of ownership and ACLs > > If all the ACLs are updated daily I guess thats not a problem, just > update them again after the restore :) > > Or make a script that saves the ACLs before backup to a file and run as > a preschedulecmd. > > Sounds like it could be worth it to avoid unnecessarily backing up 15 TB of > data every day. > > -km > > On 16/02, Mark Stapleton wrote: > > Perhaps. But what happens when you restore files without the latest ACLs? > > They're set for a reason, and to not restore the entire file's contents > > strikes me as rather worthless. > > > > -- > > Mark Stapleton > > System engineer, CDW > > > > > > -----Original Message----- > > From: ADSM: Dist Stor Manager [mailto:[email protected]] On Behalf Of > > Rolf Meyer > > Sent: Monday, February 16, 2009 3:16 PM > > To: [email protected] > > Subject: Re: [ADSM-L] Backup of ownership and ACLs > > > > Hello > > > > I think, there's an option called SKIPACLUPDATCHECK, which can be used > > to prevent incr backups just because of changing ACL-infos. > > > > Give it a try. > > > > Rolf Meyer > > Storage Consultant > > PROFI Engineering Systems AGAlexander Födisch schrieb: > > > Hi all, > > > > > > if we change the ownership (chmod/chgrp) or the ACLs of files/folders on > > > our GPFS-filesystem, all affected > > > data will be backed up again from TSM because the ctime was changed - > > > same behaviour on a XFS filesystem. > > > We often have to change recursively the ACLs of a 15TB-folder and so > > > this 15TB are backup up nearly daily... > > > I understand the necessity of backing up metadata as ownership or ACLs > > > :) But is there an other possibility? > > > > > > Can we backup just the metadata of changed files instead of all the > > > data? Depends this on the filesystem? > > > > > > No virus found in this outgoing message. > > Checked by AVG. > > Version: 7.5.552 / Virus Database: 270.10.24/1954 - Release Date: 15-Feb-09 > > 6:09 PM
