[Samba] Zero-blocks in large files (smb in libvirt/kvm RHEL)

[Peter B.]

Hi!

I'm having a very strange problem, and I'm running out of ideas how to
debug it :)

Whenever I copy large files (several hundred MB/GB per file), it happens
every now and then that some of them have blocks of zeroes in them. If it
happens, it's always between around 50kB and 150kB.

The problem occurs when I copy files from Debian6 to Samba on RHEL6.5,
using rsync.
It happens frequently, but not always...


The system setup is rather complex, since it's a network-based
multi-server 300 TB mass storage. That's why there's Linux Kernel software
RAID, libvirt/KVM, GlusterFS, etc involved.

I've narrowed it down pretty much to Samba on the RHEL6.5 KVM-Client.
(Details upon request)


If anyone has any ideas how to pin this issue down, I'd be very grateful!

Thanks a lot in advance,
Peter B.




== Versions:
Client (Debian 6)
- rsync v3.0.7
- smbd v3.5.6

Server (RHEL6.5 KVM-client):
- smbd v3.6.23-12.el6 (RHEL 6.5)