[Ocfs2-users] OCF2 and LVM

[Alexei_Roudnev]

I'd be extremely careful, combining lvm cluster with ocfsv2 cluster and with 
lvm snapshots.


----- Original Message ----- 
From: "Jordi Prats" <jprats at cesca.es>
To: "Alexei_Roudnev" <Alexei_Roudnev at exigengroup.com>
Cc: "Riccardo Paganini" <riccardo.paganini at solveit.it>; 
<ocfs2-users at oss.oracle.com>
Sent: Monday, October 08, 2007 1:01 PM
Subject: Re: [Ocfs2-users] OCF2 and LVM


> Hi,
> You could use clvm (cluster LVM): http://sources.redhat.com/cluster/clvm/ 
> to do snapshots on a clustered environment.
>
> You need to setup the RedHat cluster infrastructure, but this shouldn't be 
> a problem.
>
> I agree that rman is the correct solution to oracle backups :)
>
> regards,
> Jordi
>
> Alexei_Roudnev 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" <jprats at cesca.es>
>> To: "Riccardo Paganini" <riccardo.paganini at solveit.it>
>> Cc: <ocfs2-users at oss.oracle.com>
>> 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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>>
>>
>>
>