[Ocfs2-users] OCF2 and LVM

[Luis Freitas]

   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:

FlashSnap™, 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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>
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