[Thinlinc-technical] very unstable mechanism to share client-side media via NFS-mounts

Peter Astrand astrand at cendio.se
Wed Dec 7 13:42:35 CET 2016

Thanks for this feedback. Were you using "unfs3" or some other NFS server 
when trying out FUSE-NFS?

We're not ruling out anything and SSHFS could certainly be worth a look, 
however we must also consider the fact that we need an application level 
solution that works across all platforms (Linux, Windows, OSX and possibly 
others). Thus, we cannot rely on "sshd" running on the client etc.


On Thu, 1 Dec 2016, Юровский Р. В. wrote:

> Hi,
> I have an experience to use FUSE-NFS client in big production 
> environment and have to say, that I was not able to get stable work when 
> I have 70+ users on server and they use USB storages intensively. May be 
> FUSE-NFS client need to be fixed, I don't know I'm not a programmer-) In 
> my point of view NFS technology doesn't suite for removable USB devices 
> which have different FS types (FAT, NTFS, EXT3 etc.) with different 
> sector size and other unstable characteristics.
> I use FUSE-SSHFS for this purpose. After some tweaking (as an administrator) it works perfectly.
> Think it over about FUSE-SSHFS!
> ---
> Roman
> -----Original Message-----
> From: Thinlinc-technical [mailto:thinlinc-technical-bounces at lists.cendio.se] On Behalf Of Peter Astrand
> Sent: Wednesday, November 30, 2016 7:22 PM
> To: Rob De Langhe
> Cc: thinlinc-technical at lists.cendio.se
> Subject: Re: [Thinlinc-technical] very unstable mechanism to share client-side media via NFS-mounts
> Hi and thanks for your feedback. We are aware of that these types of
> problems happens from time to time. The problem is actually not the use of
> the NFSv3 protocol, but the fact that we are using the standard Linux
> kernel NFS client, which is not well suited for this use case. This is
> also an area with constant development, so the behaviour (amount of
> problems) may depend on which kernel you use (ie affected by choice of
> distribution).
> Have you tried "tl-umount-localdrives -vas"? Does it help? It may take
> some time, but it should eventually succeed.
> Which Linux kernel & distribution are you running?
> For the future, we are considering change the server side to use a FUSE
> based NFS client, instead of the kernel client:
> https://www.cendio.com/bugzilla/show_bug.cgi?id=4900
> It could also be interesting to hear what kind of client platforms you are
> using.
> Best regards,
> Peter
> On Tue, 29 Nov 2016, Rob De Langhe wrote:
>> hi,
>> I must say that the mechanism (up till TL-version 4.7) by which client-side media (hard disk, USB-stick, ...) are 'exported' via
>> NFS to the TL-agents, is quite unstable.
>> There is no bullet-proof procedure by which logout scripts can avoid that these NFS-mounts become 'stale'. Result is that the
>> TL-agent can only recover from such 'stale' NFS mounts via a reboot. Or worse: if the TL-agent is a *NIX container then its 'guest'
>> server (who runs the kernel) needs a reboot as well...
>> -> is there no better mechanism to share the client-side media via the VNC client-to-agent tunnels? Another protocol than NFS is
>> required to avoid the above problems.
>> brgds
>> Rob

Peter Astrand		ThinLinc Chief Developer
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