Re: Live Fille System Backup
On Sat, 06 May 2017, email@example.com wrote:
> Hm. That just means that the file will change after being copied.
There can also exist busy file *sets*, which need to be atomically
snapshotted (this is, of course, application specific).
"busy", as far as backups go, means:
1. a file changes [either in memory/buffer cache, or in the backend
storage] *while* being copied (so it is internally inconsistent) --
backup will have sections of the old file, and sections of the new
2. one or more components of a set of several files change *during*
backup (files may be internally consistent, but the set of files
In some cases, (1) and (2) can manifest as files missing from the
backup, or being zero-sized.