Thanks,

Jordan

On Jan 23, 2008, at 11:19 AM, Paul Bijnens wrote:

Jordan Desroches wrote:

Hello all,

I've been having a problem with incremental dumps on a NFS mounted Netapp. AMANDA runs great until I reboot the client (or remount the NFS shares on the client). At that point, while calcsize predicts what I believe is the correct incremental dump size, tar proceeds to do a full dump of all the NFS mounted files. I believe this has to due with something changing between mounts that tar is translating as a change to all files. Upon reading some of the documentation for tar, it indicated that in the incremental dump gnutar-lists, there should be a "1" preceding every entry to indicate that the file is NFS mounted because (Quoting http://www.gnu.org/software/automake/manual/tar/Incremental-Dumps.html "):

"Metadata stored in snapshot files include device numbers, which, obviously is supposed to be a non-volatile value. However, it turns out that NFS devices have undependable values when an automounter gets in the picture. This can lead to a great deal of spurious redumping in incremental dumps, so it is somewhat useless to compare two NFS devices numbers over time. The solution implemented currently is to considers all NFS devices as being equal when it comes to comparing directories; this is fairly gross, but there does not seem to be a better way to go." Here is an example from one of my gnutar-lists, showing what I believe are preceding zeroes, indicating that tar thinks that the files are not on NFS: 1201070794^@37216648^@0^@947801240^@0^@24^@8623377^@./unclaimed_afs/ nmlhome/mcbride/.desktop-nauset.dartmouth.edu/0.0^@Y4Dwmdeskname^@Y4Dwmdesks^@Y4Dwmdesks.bak ^@Y4Dwmsession^@^@^@0^@1180594753^@523384000^@24^@9457059^@./spacescience/web/wl/per/HenrysForkFishing^@YIMG_0103.jpg ^@YIMG_0104.jpg^@YIMG_0105.jpg^@YIMG_0106.jpg^@YIMG_0107.jpg^@YIMG_0108.jpg ^@YIMG_0109.jpg^@YIMG_0110.jpg^@YIMG_0111.jpg^@YIMG_0112.jpg^@YIMG_0113.jpg ^@YIMG_0114.jpg^@YIMG_0115.jpg^@YIMG_0116.jpg^@YIMG_0117.jpg^@YIMG_0118.jpg ^ @YIMG_0119 .jpg ^ @YIMG_0120 .jpg ^ @YIMG_0121 .jpg^@YIMG_0214.jpg^@^@^@0^@1170258810^@0^@24^@11505238^@./paulsen/ MAC_Keith/Mac_NIH/Proposals/Breast PPG/Original Proposal '98/ Letters^@

Here's how the FS is mounted in /etc/fstab:

192.168.0.2:/vol/research /mnt/thayerfs/research nfs hard,rsize=32768,wsize=32768 0 0

And here is an example disk list entry:
tardis  /mnt/thayerfs/research_p-z /mnt/thayerfs/research {
 nocomp-test
 include "./[p-zP-Z]*"
}
Has anyone run into this problem, or know how to fix it?

Very related to this:

http://wiki.zmanda.com/index.php/Tar_dumps_every_file_in_a_level-1_backup_after_a_hardware_change

and fixing (each time you have the change!!) it with this script:

http://www.gnu.org/software/tar/utils/tar-snapshot-edit.html

This is actually a gnutar problem...


--

Paul Bijnens, xplanation Technology Services Tel +32 16 397.511 Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512 http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com

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