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List:       cifs-protocol
Subject:    Re: [cifs-protocol] cifs client timeouts and hard/soft mounts
From:       "Christopher R. Hertel" <crh () samba ! org>
Date:       2010-12-07 20:53:04
Message-ID: 4CFE9EB0.8010309 () samba ! org
[Download RAW message or body]

Matt Ficken (Insight Global) wrote:
> If the connection from the WAN Accelerator to the origin SMB server is down (ie the \
> origin SMB server is down), shouldn't the WAN Accelerator realize that, and then \
> not be responding to SMB echoes (at least responding as though it was the origin \
> SMB server)?

In theory, theory and practice are the same.  In practice they're not.

In other words, "should do" and "does do" are two very different things.  :)

...but I agree with Volker and Jeremy and others.  It's not our[1] job to
fix these things unless the fix is generally beneficial to the implementation.

Chris -)-----
[1]Where "our" refers to SMB/CIFS implementers in general.

> -----Original Message-----
> From: samba-technical-bounces@lists.samba.org \
>                 [mailto:samba-technical-bounces@lists.samba.org] On Behalf Of \
>                 Volker Lendecke
> Sent: Monday, December 06, 2010 12:17 PM
> To: Christopher R. Hertel
> Cc: Steve French; cifs-protocol@samba.org; samba-technical@lists.samba.org; Jeff \
>                 Layton; linux-cifs@vger.kernel.org
> Subject: Re: cifs client timeouts and hard/soft mounts
> 
> On Mon, Dec 06, 2010 at 12:54:30PM -0600, Christopher R. Hertel wrote:
> > There are a lot of companies out there that do WAN acceleration and each of
> > them do things differently, so there is no good answer to your quite
> > rational question.  Some of the vendors are very focused on "just like the
> > real thing" behavior while others are willing to compromise behavior in
> > favor of acceleration.
> > 
> > The best-known product in this market would be Riverbed.  BlueCoat is
> > another, I think.
> 
> Sorry, but if a WAN accelerator does not have the smarts to
> see that if a client sends smbechos, it is in trouble, then
> that WAN accelerator is just broken. It does not necessarily
> need to send these echos across the WAN link, but it must
> trigger its own server liveliness check at this point.
> 
> Volker
> 

-- 
"Implementing CIFS - the Common Internet FileSystem" ISBN: 013047116X
Samba Team -- http://www.samba.org/     -)-----   Christopher R. Hertel
jCIFS Team -- http://jcifs.samba.org/   -)-----   ubiqx development, uninq.
ubiqx Team -- http://www.ubiqx.org/     -)-----   crh@ubiqx.mn.org
OnLineBook -- http://ubiqx.org/cifs/    -)-----   crh@ubiqx.org
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