[Ocfs2-users] ocfs2 migration

[Mehmet Can ÖNAL]

Could you explain  more about cluster sizes and number of slots? Also their effects to sizes? I know not much about them so it's hard to understand the effect for me :)

Another point that i want to mention is we "fscp" 250GB ocfs volume to another 250GB ocfs2 volume that is terminated. When look at the copied parts i see that we lost nearly 8GB, the data is grown 8GB. Every 30GB datafile is become 31GB datafile in ocfs2. What is this 8GB stand for? Is it all journal?


Thanx for your time

İyi Çalışmalar
 
Mehmet Can ÖNAL
Sistem Uzman Yardımcısı
Merkezi Sistem Yönetimi Müdürlüğü
 
  
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mconal at fintek.com.tr

-----Original Message-----
From: Sunil Mushran [mailto:Sunil.Mushran at oracle.com] 
Sent: Wednesday, February 27, 2008 8:16 PM
To: Mehmet Can ÖNAL
Cc: ocfs2-users at oss.oracle.com
Subject: Re: [Ocfs2-users] ocfs2 migration

The biggest difference in metadata usage between ocfs and ocfs2 would be
the journal. We use larger journals in ocfs2 (for performance). Also,
we use a default of 4 slots, which may be more than you require. If so,
reduce.

The other thing would be clustersize. If the volume only has large files,
then this will not be an issue. If, however, you have many small files
and are using a large clustersize, reduce cs.

To see the journal sizes, do:
$ debugfs.ocfs2 -R "ls -l //" /dev/sdX

To see the clustersize/numslots, do:
$ tunefs.ocfs2 -Q "Clustersize=%T, Slots=%N\n" /dev/sdX

For more, refer:
http://oss.oracle.com/projects/ocfs2/dist/documentation/ocfs2_faq.html#FORMAT

Sunil

Mehmet Can ÖNAL wrote:
>
> Hi all,
>
>  
>
> I am trying to migrate my system to ocfs2 and i am testing the methods 
> recommended from oracle. I tried fscat tool to migrate (copy) my ocfs 
> data to another ocfs2 formatted disk. The copying processes is 
> terminated because of not enough space.
>
> My source disk ora1 is 250 GB total space and 536 MB is free for 
> usage. I have clone of this source disk (using EMC storages) and I 
> tried to fscp from this clone. My destination disk is 250 GB total 
> space and as I see copying process is terminated because of not enough 
> space. I checked what is copied or not and I see not copied part is 
> not too small.
>
>  
>
> I want to  ask
>
> - Is this a special case for fscat (fscp) or is data extended while 
> migration from ocfs to ocfs2?
>
> - do you know another method for migration apart from fscat and 
> backup/restore methods?
>
>  
>
> Thanx
>
>  
>
> İyi Çalışmalar
>
>  
>
> Mehmet Can ÖNAL
>
> Sistem Uzman Yardımcısı
>
> Merkezi Sistem Yönetimi Müdürlüğü
>
>  
>
> Eskişehir Yolu 4.Km. 2.Cad. No:63 C Blok
>
> Söğütözü 06520 ANKARA
>
> Tel    : 312 289 1053
>
> Voip  : 6432
>
> Faks : 312 2891450
>
> mconal at fintek.com.tr <mailto:mconal at fintek.com.tr>
>
>  
>
> ------------------------------------------------------------------------
>
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