[Samba] samba server file read size limit of 64MB for HDF files

[Kevin Taylor]

Just to add a little info, we found that Windows XP has some sort of internal read buffer of around 67,076,095 bytes. There's a couple of references to a number like that on the internet.

However, a windows 2008 server share seems to ignore, or account for that buffer and handles the reads properly, but a Samba share does not.

Does anyone have any thoughts or ideas on a setting that might help?



> From: groucho.64738 at hotmail.com
> To: samba at lists.samba.org
> Date: Wed, 7 Apr 2010 09:41:41 -0400
> Subject: [Samba] samba server file read size limit of 64MB for HDF files
> 
> 
> Sorry if that's a vague subject, but this problem is a little weird and I'm just wondering if there are any suggestions out there.
> 
> We've got a Samba server (3.0.23) running on a CentOS 5.3 server offering up a data share of 7TB on an XFS filesystem. The authentication all happens through a Samba PDC with an LDAP backend all on a different server. The system in question is just a domain member fileserver.
> 
> On the data share are several HDF files that we try to read into a couple of different applications on XP. I'm using the Compaq Array Visualizer just to look at them. The files on the server are owned by root, and world read/writable. As a regular user on the XP client, if I look at one of the files that's ~30MB in size, I'm presented with all the numbers I expect to see. If I look at a file that's larger than 64MB (80MB for the specific ones I was testing, but we've found the problem after 64MB in size) I no longer see the numbers that I would expect...it's all zeroed out at the beginning.
> 
> If I copy the 80MB HDF to my local XP workstation, it works fine, so it's not a corrupted file or anything.
> 
> The weird part is that if I go onto the linux server and change the ownership of the file to my regular user account, it all works fine...I can read the 80MB file through samba and see all the numbers I should...but no other users can. If I change the ownership to someone else, they can then see it all, and I can't again.
> 
> At one point all of these files were hosted from a Windows 2008 Server, and never experienced these problems, only after the move to the Samba server.
> 
> The fact that anything smaller than 64MB works, starts to sound like a possible setting that I can change.
> 
> Unfortunately I can't provide the HDF files I'm using, and if you want to see the smb.conf let me know and I can try to get that posted.
> 
> If anyone has any insight or help to offer, it would be appreciated.
> 
> Thanks.
> 
> Kevin Taylor
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