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

Jeremy Allison jra at samba.org
Mon Jun 1 14:41:51 MDT 2015


On Mon, Jun 01, 2015 at 12:21:40PM +0200, Peter B. wrote:
> 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!

What would be helpful is discovering if this is a client or
server bug. Do you get issues when running rsync on a Windows
client against the same Samba share ?


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