[Ocfs2-users] OCFS2 hosting and running binaries

[Luis Freitas]

Saul,

   OCFS2 1.2 doesnt has support for indexed directories. So you will need to have a cleaning procedure for the database dump directories to keep the quantity of log files reasonable. Unless you dont mind a "ls" hanging when you try to find a trace. I am not sure if OCFS 1. has support for indexed directories on the enterprise tree.

   Also when sharing database binaries there is a need to use a special type of file that is different on each node for certain configuration files . The OCFS2 1.2 "enterprise" has support for this. This was necessary on 10g, not sure about 11g.

    There are some files that need to be outside of OCFS2 1.2 so you will need to create some symlinks for each database too. And the mount options for database files and binaries/traces are different, so you will need to plan your filesystems in a way to keep datafiles, logfiles, archivelogs separated from your binaries and trace/dump locations. 

    One important point is that when you do this you will be unable to do a rolling patch application. Depending on your availability requirements this could be important.

    Also you introduce a single point of failure. If someone accidentaly damage or delete a important database or configuration file the entire cluster will fail. When you have non-shared binaries filesystems one would expect the other nodes to continue operating if this happens.

Regards,
Luis

--- On Tue, 6/9/09, Sunil Mushran <sunil.mushran at oracle.com> wrote:

> From: Sunil Mushran <sunil.mushran at oracle.com>
> Subject: Re: [Ocfs2-users] OCFS2 hosting and running binaries
> To: "Saul Gabay" <SaulG at herbalife.com>
> Cc: "Server Ops_Linux" <ServerOps_Linux at herbalife.com>, ocfs2-users at oss.oracle.com
> Date: Tuesday, June 9, 2009, 5:20 PM
> Sure. One can use ocfs2 to host
> almost anything. The one exception
> is the crs_home. crs_home needs to be on a local volume.
> 
> OCFS 1.2/1.4 has two limits. Like ext3, the number of
> sub-directories in _a_
> directory cannot exceed 32000. (There is no limit to the
> number of subdirs
> in a volume.) The other limit is the volume size. Currently
> max is 16T.
> There is no limit to the number of files in a volume. (The
> two limits have
> been relaxed in mainline for few kernel versions.)
> 
> As far as performance goes, I have yet to see a benchmark
> that shows ocfs2
> slower than gfs/gfs2.
> 
> For certification, please check metalink.
> 
> Sunil
> 
> Saul Gabay wrote:
> >
> > We are currently using OCFS2 to host multiple Oracle
> 10g RAC databases 
> > on Itanium servers running Redhat AS 4.7, we are
> running this OCFS2 
> > version so far with no issues
> >
> >  
> >
> > ocfs2-2.6.9-78.0.13.EL-1.2.9-1.el4
> >
> >  
> >
> > We would like to use OCFS2 to host binaries files for
> the database and 
> > / or application.
> >
> >  
> >
> > This will be 4 active nodes mounting an OCFS2
> formatted LUN through iSCSI.
> >
> >  
> >
> > What are the issues, caveats or things we need to be
> aware if we take 
> > this approach.
> >
> >  
> >
> > Like, is there a limit on the number of files or
> directories hosted on 
> > OCFS2?
> >
> >  
> >
> > Are there a performance issue / degradation in
> comparison with GFS 
> > hosting binaries files?
> >
> >  
> >
> > What are the good, bad and ugly of OCFS2 in comparison
> with GFS 
> > hosting binaries files?
> >
> >  
> >
> > Is OCFS2 certified by Oracle to run
> database/application binaries?
> >
> >  
> >
> > Please advice what is your experience on this topic,
> it will be 
> > greatly appreciated.
> >
> > /*/ /*/
> >
> > /*/Saul/*/
> >
> 
> 
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