HAST: primary might get stuck when there are connectivity problems with secondary

[Pawel Jakub Dawidek]

On Thu, Apr 29, 2010 at 11:03:33AM +0300, Mikolaj Golub wrote:
> 
> On Wed, 28 Apr 2010 23:46:36 +0200 Pawel Jakub Dawidek wrote:
> 
>  PJD> Could you see if the following patch fixes the problem for you:
> 
>  PJD>         http://people.freebsd.org/~pjd/patches/hastd_timeout.patch
> 
>  PJD> The patch sets timeout on both incoming and outgoing sockets on primary
>  PJD> and on outgoing socket on secondary. Incoming socket on secondary is
>  PJD> left with no timeout to avoid problem you described above.
> 
> The patch works for me.
> 
> After disabling the network connection between the primary and the secondary
> FS operations on the primary do not get stuck and the following messages are
> observed:
> 
> Apr 29 10:37:41 hasta hastd: [storage] (primary) Unable to receive reply header: Resource temporarily unavailable.
> Apr 29 10:37:57 hasta hastd: [tank] (primary) Unable to receive reply header: Resource temporarily unavailable.
> Apr 29 10:37:57 hasta hastd: [tank] (primary) Unable to send request (Resource temporarily unavailable): WRITE(972292096, 14336).
> Apr 29 10:38:56 hasta hastd: [storage] (primary) Unable to connect to 172.20.66.202: Operation timed out.
> Apr 29 10:39:12 hasta hastd: [tank] (primary) Unable to connect to 172.20.66.202: Operation timed out.
> 
> After restoring the network connection the primary reconnects to the secondary
> and the status changes back from "degraded" to "complete".

Good. And I assume you don't observe problems on secondary? Eg. recv(2)
on secondary doesn't timeout?

-- 
Pawel Jakub Dawidek                       http://www.wheelsystems.com
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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