Simo Sorce wrote:
On Fri, 2008-04-25 at 18:40 +0200, Paul Slootman wrote:
On Fri 25 Apr 2008, Kor Kiley wrote:
The rsync command I'm using is:
rsync -auz --remove-source-files /m2/archives /nfs-destination
The problem I'm having is that ~50% of the files that are moved are
missing a creation date. The main problem with this is that the backup
There is no such thing as a "creation date" in unix/linux.
Commonly people misinterpret the "ctime" field as having something to do
with "creation", but actually the C stands for "inode change".
Hence the ctime will be updated if you change the owner of a file, or
make a hard link to the file; anything that changes the information in
the inode.
Of course, I don't know what your combination of NFS over an NTFS disk
does with such "unix" concepts...
I am aware of the ext3 and NTFS timestamp differences. If a create
date didn't show up in any of the files transferred to the windows
server, I might assume that this is the way that unix/windows date
stamp differences were intended to be handled. However, the fact that
around 50% of files did get a create date, and that the date reflects
the time the file was transferred, makes me think that this is what was
supposed to happen. The fact that using cp to copy files from the
linux box to the windows box always leaves a file with a create date,
reinforces my assumption.
FYI: While ext3 does not have a creation time field, NTFS does.
What the w2k3 NFS server does is hard to say given no sources are
available (Afaik).
In any case rsync is probably not to blame as the NFS layer will
probably mask any chance for rsync to deal with native NTFS creation
time even if it were willing to.
When data is copied with rsync, the ctime field should contain the current
timestamp. Not having any ctime would be surprising. It would help if
you explained exactly why you think the "creation date" is missing, what
tools have you used to determine this and what exactly do they show?
software always thinks that they are new versions and always backs them
up during an incremental backup. I also haven't found a good way of
"Backup software" should look at the modification time, not at the
"creation date" or ctime. Is this "backup software" something different
than rsync?
Windows has a real creation time in the metadata, so it is certainly
correct for native backup tools to look into that date too.
Simo.
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