Re: separate owner/ORACLE_HOME for crs, ASM, and database in RAC environment

  • From: "Li Li" <litanli@xxxxxxxxx>
  • To: "Dan Norris" <dannorris@xxxxxxxxxxxxx>
  • Date: Wed, 12 Dec 2007 20:50:42 -0600

Hi, Dan,

my OSASM group is "dba" also, I know this defeats some of the separation,
but I just wanted to test this out. It's very strange to me that I have this
issue because in my case both oracle and oraclex have "oinstall" as primary
group and "dba" as second group, and oracle's RDBMS home and oraclex's RDBMS
home all have 775 permission. I am trying to get some other eyes on this
issue to see what I am missing :(

Thank you all for your time to reply!
-Li

On Dec 12, 2007 7:20 PM, Dan Norris <dannorris@xxxxxxxxxxxxx> wrote:

> In my experiences with this, the oraclex user (the RDBMS owner) will have
> to be in the OSASM group. This defeats some of the separation, but as I
> understand it, the Oracle developers know that the separation isn't quite
> complete yet and someone told me that we should expect "true" separation in
> a future release (probably 11g R2). If your OSASM group is also dba, then
> I'm not sure I know why you're having issues. I tried the same thing and had
> three users: 1) a clusterware owner, 2) an ASM owner, and 3) an RDBMS owner.
> I found that the clusterware can be separated pretty cleanly from the other
> two, but the ASM and RDBMS owners essentially have power over each others'
> domains since the RDBMS user must be in the OSASM group and I think the ASM
> owner may have had to be in the OSDBA. I don't have access to my test
> systems for this any longer, so my memory may be a little off. It's also
> possible that things have changed slightly since my testing which was done
> with 11gR1-beta5.
>
> Dan
>
>
> ----- Original Message ----
> From: Li Li <litanli@xxxxxxxxx>
> To: William Wagman <wjwagman@xxxxxxxxxxx>
> Cc: finn.oracledba@xxxxxxxxx; oracle-l <oracle-l@xxxxxxxxxxxxx>
> Sent: Wednesday, December 12, 2007 5:51:26 PM
> Subject: Re: separate owner/ORACLE_HOME for crs, ASM, and database in RAC
> environment
>
> Hi, Bill,
>
> I don't use asmlib because its dependency on linux kernel. I just create
> ASM diskgroups using RAW devices. when I login as oracle and start dbca, ASM
> disks are all look/work fine.
>
>
> On Dec 12, 2007 5:14 PM, William Wagman <wjwagman@xxxxxxxxxxx> wrote:
>
> >  Greetings,
> >
> > The thinking is to separate CRS, ASM and RDBMS for ease of maintenance.
> > This is also the Oracle suggestion that each be in a separate home. It makes
> > patching and upgrading easier.
> >
> > As to the disk issues. First are you using ASMLIB? Make sure if you are
> > it is configured correctly and the disks have been created.
> >
> > Also look at the status of this disks as described in v$asm_disk. They
> > status must be either provisioned or candidate. I have encountered this
> > situation before where the status was unknown and that caused me problems.
> >
> > Also, are you using multipathing? If so make sure you have scanorder and
> > scanexclude set correctly in the oracleasm file as that can affect things.
> > There was a thread about this a while ago.
> >
> > I apologize for not being more specific but I still don't have a good
> > enough understanding of how things work. A lot of what I have done is
> > through trial and error and can give you things to look at but that's about
> > it at this point.
> >
> >
> > Bill Wagman
> > Univ. of California at Davis
> > IET Campus Data Center
> > wjwagman@xxxxxxxxxxx
> > (530) 754-6208
> >
> >
> >  *From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx
> > ] *On Behalf Of *Finn Jorgensen
> > *Sent:* Wednesday, December 12, 2007 2:09 PM
> > *To:* litanli@xxxxxxxxx
> > *Cc:* oracle-l
> > *Subject:* Re: separate owner/ORACLE_HOME for crs, ASM, and database in
> > RAC environment
> >
> >   Before trying to figure this one out, I'm trying to wrap my brain
> > around why you would do that. What's the thinking behind this setup?
> >
> > Finn
> >
> >
> > On 12/12/07, Li Li <litanli@xxxxxxxxx> wrote:
> > >
> > > Hi, List,
> > >
> > > I am testing to setup a 2-node RAC environment with separate
> > > owner/ORACLE_HOME for crs, ASM, and database, it's 10gR2 on Redhat AS 4.
> > >
> > > 2 users are created: oracle and oraclex, oracle owns clusterware home
> > > and ASM home, oraclex owns database home.
> > >
> > > first, I login as oracle and installed clusterware and database
> > > software (in 2 different oracle home of course), configured and started 
> > > ASM
> > > instance, everything worked fine.
> > >
> > > second, I login as oraclex and installed database software, then I
> > > tried to create a database using dbca, but I ran into error when I chose 
> > > ASM
> > > as my database storage, the error is:
> > > "DBCA could not startup the ASM instance configured on this node. To
> > > proceed with database creation using ASM you need the ASM instance to be 
> > > up
> > > and running. Do you want to recreate the ASM instance on this node?"
> > >
> > > But the ASM instance IS already running. I am guessing this must be
> > > because of some permission issue but I am not sure what I am missing. I 
> > > have
> > > oracle and oraclex both have "oinstall" as primary group and "dba" as 
> > > second
> > > group.
> > >
> > > I googled but cannot find any useful information. Can anybody give me
> > > some suggestion? Any comment would be greatly appreciated!
> > >
> > > Thanks,
> > > -Li
> > >
> > >
> > >
> >
> >
>
>

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