On Wed, Jun 11, 2008 at 9:56 AM, Dave Holland <dh3@sanger.ac.uk> wrote:

Hello,

I'm seeing some strange behaviour with a FAS3040 filer I have on
evaluation at the moment. I have an NTFS-style qtree exported by NFS and
CIFS. Debian Linux clients see odd behaviour relating to open() and
stat64() system calls. This strace output from "vim" captures it in a
nutshell:

uname({sys="Linux", node="acheron", ...}) = 0
stat64("ffff", 0xbfb4d030) = -1 ENOENT (No such file or directory)
stat64("ffff", 0xbfb4d0b0) = -1 ENOENT (No such file or directory)
access("ffff", W_OK) = -1 ENOENT (No such file or directory)
open("ffff", O_RDONLY) = -1 ENOENT (No such file or directory)
readlink("ffff", 0xbfb4c7cc, 1023) = -1 ENOENT (No such file or directory)
open(".ffff.swp", O_RDONLY) = -1 ENOENT (No such file or directory)
open(".ffff.swp", O_RDWR|O_CREAT|O_EXCL, 0600) = -1 EACCES (Permission denied)
stat64(".ffff.swp", {st_mode=S_IFREG|0777, st_size=0, ...}) = 0

Note that the open(O_RDWR...) call fails with EACCES; but the following
stat64() call succeeds. The file ffff.swp was created on disk despite
the reported failure of the open() call.

This behaviour is seen using "vim" to edit files, and causes an error
message about the swap file being present (due to the swap file being
created even though the open() return value implies it was not).

Trying the same "vim" command on a Tru64 NFS client, correct behaviour
is seen: the open(O_RDWR...) succeeds and a filehandle is returned.

I asked Netapp support and they suggested a mixed-style qtree. But I've
read on this list about the last-change-wins problem on permissions and
ACLs, and I'd really rather not go there.

I've worked through the troubleshooting guide:
http://now.netapp.com/NOW/knowledge/docs/olio/guides/ontap_troubleshooting
with no luck.

Is there anything else I can configure (on the filer or on the clients)
to avoid this problem? Thanks for any suggestions!

Dave
--
** Dave Holland ** Systems Support -- Infrastructure Management **
** 01223 496923 ** The Sanger Institute, Hinxton, Cambridge, UK **

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