[Ocfs2-users] OCFS2 on CentOS 4.5 for CRS/RAC

[Anjan Chakraborty]

Great -- what an advice!

Sunil Mushran <Sunil.Mushran at oracle.com> wrote:  Well, here's your chance to find the problem and fix it. :)

Anjan Chakraborty wrote:
> Can you define what does it mean by "flakiness"?
> Here are points and after that tell me whether my comparision is 
> apples-to-apples or apples-to-oranges.
> 1. Why CRS installation on OCFS2/Shared drive based file system worked 
> fine but not Oracle RDBMS?
> 2. If I use EXT3 on that Shared drive, there is no problem (but that 
> doesn't give Cluster feature & so unacceptable).
> So, the shared drive has no problem, not at all and blaming that won't 
> solve the issue -- it got to be somewhere between OCFS2, Oracle RDBMS 
> & OS specific binaries.
> What's your opinion now?
>
> */Sunil Mushran /* wrote:
>
> When you use RAW, you are using it for only datafiles and
> not binary homes. So you are not comparing apples-to-apples.
>
> Bottomline, the fs requires a stable shared disk to work. Any
> flakiness in the shared disk, and you will encounter the errors
> that you are experiencing.
>
> Anjan Chakraborty wrote:
> > Mark,
> > Unfortunately that's not an option. Because I am doing it for
> > non-busines/educational purpose & I/we don't have money to go for
> > anything except FireWire. Moreover, if I use only RAW partitions of
> > that FireWire drive, everything works fine. So, it's clearly an
> OCFS2
> > issue. Can you please ask your enginners to look into this if they
> > have time?
> > I heard many people (e.g. Jeff Hunter who wrote how to do it) have
> > implemented FireWire/OCFS2/CRS/RAC witthout any issue -- and if
> that
> > is the case, why wouldn't it work for us?
> > Thanks for your help.
> > Anjan
> >
> >
> > */Mark Fasheh /* wrote:
> >
> > On Tue, Nov 27, 2007 at 11:32:52AM -0800, Anjan Chakraborty wrote:
> > > Mark,
> > > Thanks to both of you for trying to help me.
> > > I have alreaddy communicated to Luis that I have to have OCFS2
> > because my
> > > software needs Clustering technology that is absent in EXT3.
> > Moreover, both CRS
> > > & RDBMS homes should also be on shared/clustered system -- so,
> > OCFS2 is the
> > > only choice.
> > > If you can help me to understand/resolve this issue, I will
> > really appreciate
> > > that.
> > > Please note that my FireWire shared drive works perfectly when I
> > use RAW but as
> > > soon as I am trying to use OCFS2, all the problems started.
> >
> > Where did you get the drivers for a shared firewire disk from? Can
> > you try
> > iscsi or aoe for your shared disk? The shared-disk firewire stuff
> > is known
> > to be flakey and was only ever intended for quick proto-typing.
> >
> > Actually, a while ago one of our engineers was consistently getting
> > corruptions on every block which would change the inode
> signature from
> > "INODE01" to "KNODE01". Getting him off of the firewire stuff
> > solved that
> > issue (hardware and ocfs2 version stayed the same). I'd venture to
> > guess
> > that you're hitting the same type of problem.
> > --Mark
> >
> > --
> > Mark Fasheh
> > Senior Software Developer, Oracle
> > mark.fasheh at oracle.com
> >
> >
> >
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