Hello all,
in the setup I try to build I want to have snapshots of a file
system replicated from host "replsource" to host "repltarget" and
from there NFS-mounted on host "nfsclient" to access snapshots
directly:
replsource# zfs create pool1/nfsw
replsource# mkdir /pool1/nfsw/lala
replsource# zfs snapshot pool1/[EMAIL PROTECTED]
replsource# zfs send pool1/[EMAIL PROTECTED] | \
ssh repltarget zfs receive -d pool1
(a "pool1" exists on repltarget as well.)
repltarget# zfs set sharenfs=ro=nfsclient pool1/nfsw
nfsclient# mount repltarget:/pool1/nfsw/.zfs/snapshot /mnt/nfsw/
nfsclient# cd /mnt/nfsw/snap1
nfsclient# access ./lala
access("./lala", R_OK | X_OK) == 0
So far, so good. But now I see the following:
(wait a bit, for instance 3 minutes, then replicate another
snapshot)
replsource# zfs snapshot pool1/[EMAIL PROTECTED]
replsource# zfs send -i pool1/[EMAIL PROTECTED] pool1/[EMAIL PROTECTED] | \
ssh repltarget zfs receive pool1/nfsw
(the PWD of the shell on nfsclient is still /mnt/nfsw/snap1)
nfsclient# access ./lala
access("./lala", R_OK | X_OK) == -1
(if you think that is surprising, watch this:)
nfsclient# ls /mnt/nfsw
snap1 snap2
nfsclient# access ./lala
access("./lala", R_OK | X_OK) == 0
The "access" program does exactly the access(2) call illustrated in
its output.
The weird thing is that a directory can be accessed, then not
accessed after the exported file system on repltarget has been
updated by a zfs recv, then again be accessed after an ls of the
mounted directory.
In a snoop I see that, when the access(2) fails, the nfsclient gets
a "Stale NFS file handle" response, which gets translated to an
ENOENT.
My problem is that the application accessing the contents inside of
the NFS-mounted snapshot cannot find the content any more after the
filesystem on repltarget has been updated. Is this a known problem?
More important, is there a known workaround?
All machines are running SunOS 5.10 Generic_127128-11 i86pc. If some
more information could be helpful, I'll gladly provide it.
Regards, Juergen.
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