I am trying to keep a file system (actually quite a few) in sync across two
systems for DR purposes, but I am encountering something that I find strange.
Maybe its not strange, and I just don't understand - but I will pose to you
fine people to help answer my question. This is all scripted, but I have pulled
out the relevant commands for your reference:
I have a file system on localnode and I create a snapshot call "NMINUS1" which
I then send to my remotenode.
zfs snapshot GT/test@NMINUS1
zfs send GT/test@NMINUS1 | ssh remotenode zfs receive GT/test@NMINUS1
This works properly, I then get the mountpoint property of the filesystem on
the localnode and using that, set it to the same on the remote node:
$mp = zfs get -Ho value mountpoint GT/test
ssh remotenode zfs set mountpoint=$mp GT/test
Again, works fine and this completes my inital setup.
>From that point onwards, I want to send an incremental snapshot on a, say,
>nightly basis. So I create a new snapshot (NSNAP), send that across, and then
>remove the old snap and rename the new to NMINUS1 ... so
zfs snapshot GT/test@NSNAP
zfs send -i NMINUS1 GT/test@NSNAP | ssh remotenode zfs receive GT/test
-- On both nodes
zfs destroy GT/test@NMINUS1
zfs rename GT/test@NSNAP GT/test@NMINUS1
Now everything works fine unless I perform a simple 'ls' on the filesystem on
the remote node. On the local node I can modify the contents of GT/test at any
time, add or remove files, etc. and when I send the incremental snapshot to the
remote node, it completes properly, and I can do this as many times as I want,
but as soon as I issue that
# ls /GT/test
on the remote node, the next time I try to send an incremental snapshot I get
the following error:
# zfs send -i NMINUS1 GT/test@NSNAP | ssh remotenode zfs receive GT/test
cannot receive incremental stream: destination GT/ahg has been modified
since most recent snapshot
Other than modifying possibly access time - what has been change in the
snapshot that causes this problem?? One item of note (or not) one system is
SPARC one is AMD based.
Thanks for any ideas.
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