[Samba] 2.2.8a-1, Raidzone, filesize > ~17.6GB

[Eric N. Moyer]

I am working with a Raidzone tech to solve a problem with our Raidzone 
NAS.  The tech told me he has not yet posted to any Samba list about this, 
and gave me permission to do so.

Using XCOPY from either NT4SP6a or W2KSP3, over varying network paths, a 
file of 18,490,235K-1 bytes or smaller will copy to the NAS successfully in 
about 45 minutes, but a file of 18,490,256K-1 bytes or larger will 
fail.  The failure occurs in about 7 minutes with a message on the Windows 
computer of either "end of file reached" (on NT) or "network path no longer 
available" (on W2K.)  When a copy fails, /var/log/samba/log.<clientname> on 
the NAS contains messages about "no response to oplock break request".

During the trials which fail, it seems that no data flows; the lights on 
the switch show no traffic, the drives on the Windows computer sending the 
file are not accessed, and the LCD display on the NAS shows only minimal 
dataflow.

We could probably narrow the threshold window further, but have not done it 
yet.

Setting oplock break wait time = 100 had no perceivable effect.  Disabling 
oplocks completely resulted in the XCOPY failing with a sharing violation 
message on the NT box.  (We did not try this variation on W2K.)

The NAS appears to be running Linux kernel 2.4.18.

I found nothing about this in open web searching.  I looked through the 
archives of this list and saw that oplock messages are often attributed to 
network problems, but if that is the case here, then I wonder why there 
seems to be a file size threshold involved.  I also saw that someone 
reported a similar situation with files of ~25GB, but there did not seem to 
be any replies.

I am hoping the file size threshold I have described above may give someone 
an insight about the situation, or that there may be suggestions for 
specific areas for the Raidzone tech and I to investigate.

Finally, I am new to Samba and this list, so I apologize for any ignorance 
on my part.

Thank you.  -Eric



Regards,

Eric Moyer (EMoyer at LibraryTech.com)
Library Technologies, Inc.
2300 Computer Avenue, Suite D-19
Willow Grove, PA  19090
Phone 215-830-9320, FAX 215-830-9422