* Alan Cox <[email protected]> wrote:
> > Can you give examples of backup solutions that rely on atime being
> > updated? I can understand backup tools using mtime/ctime for
> > incremental backups (like tar + Amanda, etc), but I'm having trouble
> > figuring out why someone would want to use atime for that.
>
> HSM is the usual one, and to a large extent probably why Unix
> originally had atime. Basically migrating less used files away so as
> to keep the system disks tidy.
atime is used as a _hint_, at most and HSM sure works just fine on an
atime-incapable filesystem too. So it's the same deal as "add user_xattr
mount option to the filesystem to make Beagle index faster". It's now:
"if you use HSM storage add the atime mount option to make it slightly
more intelligent. Expect huge IO slowdowns though."
The only remotely valid compatibility argument would be Mutt - but even
that handles it just fine. (we broke way more software via noexec)
Ingo
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