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

[Sunil Mushran]

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 <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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