On Thu, Mar 23, 2017 at 03:11:07PM +0100, Hans-Peter Jansen wrote: > Hi Michael, > > On Donnerstag, 23. März 2017 09:21:56 Michael Lueck wrote: > > Greetings, > > > > I am looking for the correct xfsdump syntax to backup dirs/files newer than > > a certain date. > > xfsdump is a tool in the tradition of unix filesystem dump utilities. > Those always dump a full filesystem, and consequently, fully restore > filesystems only. Not true. xfsdump/restore can backup directory subtrees just fine. See, for example, the '-s pathname' option.... > > I have not found mention of such an option / capability within xfsdump. > > Hopefully there is a creative way to do the selective backup. xfsdump does "backup files changed since" operations via incremental backups. i.e. if you want to backup only things changed since $DATE, you first need to have run a dump that on $DATE, and you then do an incremental dump which will contain only the changed files/dirs since $DATE... IOWs, xfsdump is designed to be used as part of a well-defined, managed backup and disaster recovery strategy - it's not an ad-hoc "copy random specification of files" tool. > Using a linux derivate, there are plenty of more or less creative options to > selectively backup/restore arbitrary file systems, but this is rather OT for > the ML. The downside of these generic utilities is they are much slower than xfsdump for large scale backup operations, they trash the inode/dentry/page caches and they don't really support concurrent operations needed to scale effectively. i.e. if you need to dump throughput of multiple GB/s, process tens/hundreds of millions of files and/or drive multiple tape drives concurrently from a single filesystem, then xfsdump is a much better option... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
