tar -N won't work over nfs

hello,

i'm sorry for reposting this message but i still have no idea. perhaps
someone of you has a solution?

i have a backup-script that makes incremental backups via tar -N $date. This
works locally but when I try to make a backup of a nfs-mounted remote it
will always result in a full backup.
when I try to set $date into the future, nothing is backed up.
So it seems, the file modification time is always the mount time.

Is there any way to prevent this?

P.S. I am using SuSE Linux 9.0 i.e. tar 1.13 and nfs 2.2

On Thu, 22 Apr 2004 10:46:56 +0200, Martin Müller
<me@privacy.net> wrote:
> hello,
>
> i'm sorry for reposting this message but i still have no idea. perhaps
> someone of you has a solution?
>
> i have a backup-script that makes incremental backups via tar -N $date. This
> works locally but when I try to make a backup of a nfs-mounted remote it
> will always result in a full backup.
> when I try to set $date into the future, nothing is backed up.
> So it seems, the file modification time is always the mount time.
>
Is that what "ls -l" shows on the remote files? What about "ls -lc"?
Try tar --newer-mtime=$date

--
Giraffe: a ruminant with a view.

On Thu, 22 Apr 2004 10:46:56 +0200, Martin Müller wrote:
> i have a backup-script that makes incremental backups via tar -N $date. This
> works locally but when I try to make a backup of a nfs-mounted remote it
> will always result in a full backup.

rsync might do a better job of this. It's designed for this. Another
option ...
[on NFS client, we'll call it "otherhost"]
nc -p 34567 -q1 > tarfile
[then on NFS server]
tar -Ncf- [opts] /path-to/files | nc otherhost 34567

You could also pipe it through tar on otherhost, if you're maintaining
a mirror of the files:
cd /directory/of/mirror ; nc -p 34567 -q1 | tar -x [opts]

I may have missed a detail or 2. Check the nc documentation if you're
interested in that nifty little tool.
--
/dev/rob0 - preferred_email=i$((28*28+28))@softhome.net
or put "not-spam" or "/dev/rob0" in Subject header to reply

"Bill Marcum" <bmarcum@iglou.com.urgent> schrieb im Newsbeitrag
news:0qlml1-k02.ln1@don.localnet...
> On Thu, 22 Apr 2004 10:46:56 +0200, Martin Müller
> <me@privacy.net> wrote:
> > hello,
> >
> > i'm sorry for reposting this message but i still have no idea. perhaps
> > someone of you has a solution?
> >
> > i have a backup-script that makes incremental backups via tar -N $date.
This
> > works locally but when I try to make a backup of a nfs-mounted remote it
> > will always result in a full backup.
> > when I try to set $date into the future, nothing is backed up.
> > So it seems, the file modification time is always the mount time.
> >
> Is that what "ls -l" shows on the remote files? What about "ls -lc"?

ls -l shows the correct dates

> Try tar --newer-mtime=$date

this works! What a pitty that this option is not mentioned in the tar
manpage :-(

thank you for your help!
>
> --
> Giraffe: a ruminant with a view.

In comp.os.linux.networking, Martin Müller uttered these immortal words:

>> Try tar --newer-mtime=$date
>
> this works! What a pitty that this option is not mentioned in the tar
> manpage :-(

Are you sure? At line 145 I have:

--newer-mtime DATE
only store files whose contents have changed after DATE

--
Andy.

On Mon, 26 Apr 2004 14:48:07 +0100, Andy Fraser wrote:
>> this works! What a pitty that this option is not mentioned in the tar
>> manpage :-(
>
> Are you sure? At line 145 I have:

I think the GNU coreutils man pages are very bad. Perhaps you're using
a distro which distributes a modified version of the man page.
--
/dev/rob0 - preferred_email=i$((28*28+28))@softhome.net
or put "not-spam" or "/dev/rob0" in Subject header to reply

In comp.os.linux.networking, /dev/rob0 uttered these immortal words:

>>> this works! What a pitty that this option is not mentioned in the tar
>>> manpage :-(
>>
>> Are you sure? At line 145 I have:
>
> I think the GNU coreutils man pages are very bad. Perhaps you're using
> a distro which distributes a modified version of the man page.

You're right. I'm using Debian. Sometimes it's easy to forget how good
Debian's documentation.

To Martin: If you can't find what you want in the man page look at the info
page if there is one.

--
Andy.

"Andy Fraser" <andyfraser31@hotmail.com> schrieb im Newsbeitrag
news:nhgvl1-qg.ln1@news.linuxuser.org.uk...
> In comp.os.linux.networking, Martin Müller uttered these immortal words:
>
> >> Try tar --newer-mtime=$date
> >
> > this works! What a pitty that this option is not mentioned in the tar
> > manpage :-(
>
> Are you sure? At line 145 I have:

I doublechecked it. In the SuSE distribution manpage this option does not
exist. But I could have found it with tar --help...

>
> --newer-mtime DATE
> only store files whose contents have changed after DATE
>
> --
> Andy.