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[Linux-cluster] Re: Samba failover "impossible" due to missing cifs client reconnect?

On Wed, Sep 07, 2005 at 04:12:52PM -0500, Christopher R. Hertel wrote:
> On Wed, Sep 07, 2005 at 10:51:16PM +0200, Axel Thimm wrote:
> : :
> > > I just tested this.  On a W/XP box I browsed through some directories on a 
> > > share served by Samba.  I then shut Samba down, and tried viewing some 
> > > different subdirectories of the same share.  Windows coughed up an error 
> > > dialog.  I then restarted Samba and Windows got happy again.  I could 
> > > browse through all of the subdirectories in the share.
> > 
> > Yes, that does work, but what I wanted to setup is a transparent
> > failover, so that network I/O recovers w/o any manual interaction.
> >
> > I.e. I don't want to (soft) relocate the samba shares onto another
> > node due to load ballancing considerations and generate user visible
> > I/O errors and failures on a dozen clients.
> I guess I'm not really clear on what it is you're trying to accomplish.
> Can you provide a little more description of what you'd like to see 
> happen, and what kinds of environments you expect?

A cifs client performs a largish copy operation. During that the share
is relocated to a different node. The copy operations should stall
during the relocation and resume after 10-20 seconds.

But if the cifs client does not perform a retry on smb/cifs protocol
level (on TCP level it will get a RST, it's the next level protocol
that needs to decide on retransmit the read/write request), then there
is nothing you can do server-side.

Perhaps there are magic registry keys that can persuade Windows
clients to do otherwise.
Axel.Thimm at ATrpms.net

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