On 2020-05-04 09:55, Alvin Starr via talk wrote:
I am hoping someone has seen this kind of problem before and knows of a solution. I have a client who has file systems filled with lots of small files on the orders of hundreds of millions of files. Running something like a find on filesystem takes the better part of a week so any kind of directory walking backup tool will take even longer to run. The actual data-size for 100M files is on the order of 15TB so there is a lot of data to backup but the data only increases on the order of tens to hundreds of MB a day.
Even things like xfsdump take a long time. For example I tried xfsdump on a 50M file set and it took over 2 days to complete.
The only thing that seems to be workable is Veeam. It will run an incremental volume snapshot in a few hours a night but I dislike adding proprietary kernel modules into the systems.
If you have a list of inodes on the filesystem you can use xfs_db directly: xfs_db> inode 128 xfs_db> blockget -n xfs_db> ncheck 131 dir/. 132 dir/test2/foo/. 133 dir/test2/foo/bar 65664 dir/test1/. 65665 dir/test1/foo 65666 dir/test3/foo/. 142144 dir/test2/. 142145 dir/test3/foo/bar/. 142146 dir/test3/foo/bar/baz 196736 dir/test3/. I don't know how that will perform relative to something like find though. Cheers, Jamon