[Ocfs2-users] OCF2 and LVM

[Alexei_Roudnev]

I think it can do it now. Could not do it on the older versions.

  ----- Original Message ----- 
  From: Luis Freitas 
  To: ocfs2-users at oss.oracle.com 
  Sent: Tuesday, October 09, 2007 6:25 AM
  Subject: Re: [Ocfs2-users] OCF2 and LVM



     If I am not mistaken, Veritas Storage Foundation can do. It can also do online resize. But I am not a Veritas expert, feel free to correct me.

  From a whitepaper:

  FlashSnapT, a feature of Veritas Storage
  Foundation Cluster File System, can create point-in-time
  copies of production information (either at the volume or
  file system level)

      I dont know if LVM2 can do a snapshot in a clustered environment, but since OCFS2 is journaled, you can probably remount a snapshot without data loss. One could put the database in backup mode and take a snapshot.

  Regards,
  Luis

  Alexei_Roudnev <Alexei_Roudnev at exigengroup.com> wrote:
    I dont knoiw any lvm technology which can make a snapshort in clustered 
    environment, so better forget this idea.

    Recommended method to do oracle backups is rman. Any violation of this 
    brings you into the swamp of possible oracle bugs.


    ----- Original Message ----- 
    From: "Jordi Prats" 
    To: "Riccardo Paganini" 
    Cc: 
    Sent: Monday, October 08, 2007 11:20 AM
    Subject: Re: [Ocfs2-users] OCF2 and LVM


    > Hi,
    > I'm not an expert on oracle, but I don't think using a snapshot is a 
    > recommended backup solution. You should use data pump or exp utilities to 
    > backup your database.
    >
    > To extend your fs, tune2fs.ocfs2 requires you to umount it, according to 
    > it's man page:
    >
    > ==
    > tunefs.ocfs2 is used to adjust OCFS2 file system parameters on disk. In 
    > order to prevent data loss, tunefs.ocfs2 will not perform any action 
    > on the specified device if it is mounted on any node in the cluster. This 
    > tool requires the O2CB cluster to be online.
    > ==
    >
    > The concrete command should be: tune2fs.ocfs2 -S /dev/LVM_volume
    >
    > I don't know if there's any way to extend it without umounting it.
    >
    > If you want to extend your fs without umounting it you should use ASM 
    > instead of OCFS2.
    >
    > regards,
    > Jordi
    >
    > Riccardo Paganini wrote:
    >> Does anybody knows if is there a certified procedure in to backup a RAC 
    >> DB 10.2.0.3 based on OCFS2 ,
    >> via split mirror or snaphots technology ?
    >>
    >>
    >> Using Linux LVM and OCFS2, does anybody knows if is possible to 
    >> dinamically extend an OCFS filesystem,
    >> once the underlying LVM Volume has been extended ?
    >>
    >> Thanks in advance
    >> Riccardo Paganini
    >>
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