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

[Luis Freitas]

Anjan,

   You dont need to share the database binaries, only the CRS and the datafiles. You can do it to save disk space, but it is not mandatory. The CRS and datafiles are much less stressfull to the filesystem structures as there is a reduced number of large files, although they usually have a heavy i/o load, and stress the disk subsystem and the locking algorithms.

    So you can have two separated ext3 filesystems located at the same place on each server, and one or more ocfs2 shared filesystems for the CRS and the database datafiles. The Oracle installer takes care of copying the binaries between the servers during the installation.

    It might be usefull to try a lower version like 1.2.6, as you are using the latest version available. I am using 1.2.4-2 here with RH 4.0 and kernel 2.6.9-42 and it seems rather stable, only needed to increase the timeouts. (But I dont have the oracle_home shared.)

    Also you might have a hardware problem somewhere on the SAN. And I still have to check those mount options you sent...

    One detail. I dont know if the Centos distro includes the OCFS2 module. Are you using the modules downloaded from the oss.oracle.com site for the equivalent RH 4.0 kernel, or modules built by Centos? If using CENTOS modules you might get better results by changing to the Oracle built modules for the equivalent RH 4.0 kernel.

Regards,
Luis

Anjan Chakraborty <anjan.chakraborty at yahoo.com> wrote: Luis,
  I am intending to use CRS/RAC that needs a Cluster File System. How does EXT3 falls into that area?
  Thanks.
  Anjan

Thanks a lot for the response. Here is what I am doing:    
1. 
    mkfs.ocfs2 -b 4K -C 32K -N 4 -L ocrvotcrs /dev/sdb3   -- for CRS
    mkfs.ocfs2 -b 4K -C 32K -N 4 -L orasys /dev/sdb4      -- for RDBMS
     
    2. Then mounting using /etc/fstab:
    /dev/sdb3     /home/oracle/ocrvotcrs    ocfs2    _netdev,datavolume,nointr 0 0
    /dev/sdb4     /home/oracle/orasys    ocfs2    _netdev 0 0
    If you find anything wrong here, can you please tell what to do?
    It's a non-production system & so I can experiment with whatever you suggest and won't held you responsible for that.
    Thanks.
    Anjan
 
 
 
Luis Freitas <lfreitas34 at yahoo.com> wrote:
  Anjan,

  Are you installing the binaries on OCSF2 too? How are you mounting the filesystem?

  You might want to try using ext3 for the binaries and OCF2 only for datafiles and archives, until you get this fixed.

Regards,
Luis

Anjan Chakraborty <anjan.chakraborty at yahoo.com> wrote:    Hi,
  I sent an email to Mark Fisheh of Oracle Corp. & posted this issue at OTN under Linux thread this morning. I hope that someone among you might have experienced this and can help. On that basis, I am sending this to you too. I am stuck & will really appreciate if you can shed some light on this. 
  Thanks.
  Anjan
  ***********************************************************************************************************
  I have a 2 node CentOS 4.5 86_64 system (kernel 2.6.9-55.EL). On this I installed Oracle OCFS2 1.2.7-1 (with exact kernel matching). After this I installed Oracle CRS 10.2.0.1 and that installation went fine. Then I tried to install Oracle RDBMS 10.2.0.1 and all the problems started from there. The /var/log/messages file got filled up with messages (giving some to avoid confusion):
ocfs2_read_locked_inode: .. : ERROR: Invalid  dinode #0 signature =
ocfs2_lookup: .. : ERROR: Unable to create inode ....

Then OUI gave several error messages, e.g.
.... Invalid stored block length on file ...../em/em.war followed by I/O error in file
Errors in invoking to files ins_rdbms.mk and ins_ldap.mk

Then /var/log/messages gave:
OCFS2: ERROR (device ....): ocfs2_extend_file: Dinode # ...... has bad signature O' # I ....
And the installation failed & CRS died. And the machines reboot.
  I ran fsck.ocfs2 -n /dev/...., it came clean.
I have tested this several timnes & always same thing happening.
If I use RAW partitions, everything works fine. So, the problem may be in the OCFS2 & OS/Oracle -- but, not sure how to bypass this.
I have to have OCFS2 -- can't use RAW for various reasons.
Can somebody please help me to resolve this?
Thanks. 
  ***********************************************************************************************************
  
  
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