[Linux-ha-dev] Shared disk file Exclusiveness control program forHB2

[Junko IKEDA]

Hi,

You know that could be true...
but if it's called from RA, 2 nodes wouldn't reach that part at the same
time, right?
One node will be able to reach there according to the score rule.

Thanks,
Junko

> -----Original Message-----
> From: linux-ha-dev-bounces at lists.linux-ha.org
> [mailto:linux-ha-dev-bounces at lists.linux-ha.org] On Behalf Of Xinwei Hu
> Sent: Thursday, August 09, 2007 3:00 PM
> To: High-Availability Linux Development List
> Subject: Re: [Linux-ha-dev] Shared disk file Exclusiveness control program
> forHB2
>
> Hi,
>
>   There's races in the sfex_lock.c.
>
>   When 2 nodes reach sfex_lock.c:265 in the same time.
>
>   node A: reserve lock -> wait for collision_timeout -> hold lock
>   node B: sleep           -> sleep                             -> reserve
> lock
>
> $B:_(B $B at 14|;0(B 08 $BH,7n(B 2007 12:00$B!$(BNAKAHIRA Kazutomo $B<LF;!'(B
> > Hello, all.
> >
> > We wrote a Shared Disk File EXclusiveness Control Program, called
> > "SF-EX" for short, could prevent a destruction of data on
> > shared disk file system due to Split-Brain.
> >
> > This program consists of CUI commands written in the C and RA,
> > the former is used for managing and monitoring shared disk status
> > and the latter is the same as other common RAs.
> >
> > We tested this program on IBM and HP platform, and we confirmed
> > all functions worked well.
> >
> > Our test environment is listed below:
> >  Software:
> >   OS :RHEL4 ES Update5(kernel2.6.9-55.ELsmp)
> >   HB2:heartbeat-2.1.2-2
> >
> >  Hardware:
> >   IBM platform:
> >    Server     : System x3650
> >    Shared disk: DS 4700 (FC)
> >
> >   HP platform:
> >    Server     : DL380G5
> >    Shared disk: MSA500G2 (SCSI)
> >
> > How to install and configuration are described in README.
> > If you are interested in this program, please try it and
> > let me know your comments.
> >
> > Your suggestions on how to improve are really appreciated.
> >
> > Best regards.
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