Hi,

I'm building an incremental backup script using rsync. In order to
decide whether I can use the source directory as the value for --link-
dest when creating the initial backup, I need to known whether the
source and backup directory lie within the same physical filesystem
(or else I get tons of  Invalid cross-device link (18) errors).

BTW, I realize that I should always create the initial backup on
another physical filesystem, and I do. It's when I create the first
weekly/monthly snapshot from the then current daily snapshot that I
want to specify the source as link-dest. This works fine, but when the
script is used for the first daily snapshot, it *is* running between
two filesystems, and shouldn't use the source for --link-dest.

Thanks,

JJ

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In article <1183321531.189214.231100@c77g2000hse.googlegroups.com>,
jjfahner@gmail.com wrote:

> Hi,
>
> I'm building an incremental backup script using rsync. In order to
> decide whether I can use the source directory as the value for --link-
> dest when creating the initial backup, I need to known whether the
> source and backup directory lie within the same physical filesystem
> (or else I get tons of  Invalid cross-device link (18) errors).

Use "df <source>" and "df <dest>" and compare the filesystem or mount
point columns.

--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

[ Post a follow-up to this message ]

On Jul 1, 10:55 pm, Barry Margolin <bar...@alum.mit.edu> wrote:
> In article <1183321531.189214.231...@c77g2000hse.googlegroups.com>,
>
>  jjfah...@gmail.com wrote: 
> 
>
> Use "df <source>" and "df <dest>" and compare the filesystem or mount
> point columns.
>
> --
> Barry Margolin, bar...@alum.mit.edu
> Arlington, MA
> *** PLEASE post questions in newsgroups, not directly to me ***
> *** PLEASE don't copy me on replies, I'll read them in the group ***

Works like a charm. Thanks a lot!

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