Gene Heskett wrote at 10:05 -0400 on Apr  9, 2009:
 > On Thursday 09 April 2009, Dustin J. Mitchell wrote:
 > >On Thu, Apr 9, 2009 at 8:53 AM, Gene Heskett <gene.heskett AT verizon DOT 
 > >net> 
 > wrote:
 > >> Uptime is about 5 days now, but this may be the beginning of the end.
 > >> Something made it think all data was new from the looks of this.  This was
 > >> the first run of 20090323, 20090321 works fine.  Another device mapper
 > >> screwup? It was updated by yum yesterday.
 > >
 > >That seems the most likely cause.
 > >
 > >Dustin
 > 
 > Yeas, but I thought we had worked out something that made amanda immune to 
 > those little annoyances?  Or was tar changed and the fix didn't work now?
 > 
 > [amanda@coyote GenesAmandaHelper-0.6]$ tar --version
 > tar (GNU tar) 1.20
[snip]
 > Here is the amgtar stanza from amanda.conf:
 > 
 > define application-tool app_amgtar {
 >      comment "amgtar"
 >      plugin  "amgtar"
 >      #property "GNUTAR-PATH" "/path/to/gtar"
 >      #property "GNUTAR-LISTDIR" "/path/to/gnutar_list_dir"
 >      #default from gnutar_list_dir setting in amanda-client.conf
 >      #property "ONE-FILE-SYSTEM" "yes"  #use '--one-file-system' option
 >      #property "SPARSE" "yes"           #use '--sparse' option
 >      #property "ATIME-PRESERVE" "yes"   #use '--atime-preserve=system' option
 >      property "CHECK-DEVICE" "no"       #use '--no-check-device' if set to 
 > "no"
 > }
 > Do I need to set additional options?

This (snippet below from the gtar NEWS file) was added in 1.21

==========================
* New options --no-check-device, --check-device.

The `--no-check-device' option disables comparing device numbers during
preparatory stage of an incremental dump.  This allows to avoid
creating full dumps if the device numbers change (e.g. when using an
LVM snapshot).

The `--check-device' option enables comparing device numbers.  This is
the default.  This option is provided to undo the effect of the previous
`--no-check-device' option, e.g. if it was set in TAR_OPTIONS
environment variable.
==========================