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

[Anjan Chakraborty]

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 <Sunil.Mushran at oracle.com> 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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