Subject: Re: other backup technologies?
To: None <current-users@NetBSD.ORG>
From: der Mouse <mouse@Holo.Rodents.Montreal.QC.CA>
Date: 01/06/1997 20:51:49
>> Dump reads from the raw device; restore writes through the
>> filesystem, and every file create involves a bunch of synchronous
> Uh, why?
> What's wrong with a fs-neutral dump?
- it can't get holes completely right (at least not without writing to
the files in question)
- it's significantly less efficient, because it perforce walks the
filesystem in filesystem-tree order instead of inode order
- it can't help modifying atimes or ctimes
It does exist, though; it's called tar.
> Is restore fs-neutral?
Yes; restore runs atop the usual filesystem interface. That's exactly
why it's so slow - it's doing lots of file creates, and each one
involves a synchronous write of a directory block and I think an inode
block as well.
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