Re: Question on IPv6 failover.

[Ben Greear <greearb-my8/4N5VtI7c+919tysfdA@public.gmane.org>]

On 10/03/2013 03:30 PM, Steve French wrote:
> On Thu, Oct 3, 2013 at 4:04 PM, Ben Greear <greearb-my8/4N5VtI7c+919tysfdA@public.gmane.org> wrote:
>> One of our users is reporting that the CIFS failover case is not working
>> properly.  They have a cluster of CIFS servers that migrate an IPv6 addr
>> to the active system.
>>
>> Evidently, our client-side CIFS connection follows the first migration,
>> but fails to go back to the original on a second failover.
>>
>> It could be any number of things, but I wanted first to see if anyone
>> knows how long client-side CIFS will keep attempting to regain contact with
>> it's
>> server?  Forever?
>>
>> Thanks,
>> Ben
>
> Depends on kernel version and also hard vs. soft (default) mount options.
>
> The "smb echo" approach that cifs moved to a few years ago allows
> the cifs kernel client to notice more quickly that the server is down,
> and significantly improved failover.
>
> Which kernel version?

3.7.10

The hard v/s soft is not being specified when mounting unless the
customer did something interesting, so I guess it is soft.

I'm still waiting on a network dump, so at this time I have no
reason to believe that Linux CIFS is actually to blame...just
trying to understand the possibilities better.

Thanks,
Ben

-- 
Ben Greear <greearb-my8/4N5VtI7c+919tysfdA@public.gmane.org>
Candela Technologies Inc  http://www.candelatech.com