Ocfs2 users - Jan 2007 - block size - cluster size

Hello ocfs2-users,

  I have 2 questions:

  1. I forgot the block size and cluster size that I chose
  during formatting of the drive. Is there any way I can find it out
  afterwards?

  2. And what's up with the block size-cluster size anyways? I could
  find any in-depth information regarding those parametres. what is
  it?

  When I tried using the default settings my disk space was being used
  twice as normal.
  
  I am using a RAID 5 shared storage device (iSCSI) with the stripe
  size of 64KB - what should I choose?

-- 
Best regards,
 Arkadiy                          mailto:eth@ethaniel.com

Hi,
   
     Well block size is very important under RDBMS workloads, since if the
database block is smaller than the fs block size, the operating system has to
perform a read of the rest of the fs block on every database write operation,
which are always synchronous on Oracle, and scattered under normal OLTP
workloads. On other types of files this depends more on the individual size of
files, and the disk space that you want or not to waste.
   
      About cluster size, I really do not know. It might be related with the
locking necessary to the cluster filesystem.
   
      Please do correct me if I am wrong. Anyone?
   
  Regards,
  Luis Freitas

Arkadiy Kulev <eth@ethaniel.com> wrote:
  Hello ocfs2-users,

I have 2 questions:

1. I forgot the block size and cluster size that I chose
during formatting of the drive. Is there any way I can find it out
afterwards?

2. And what's up with the block size-cluster size anyways? I could
find any in-depth information regarding those parametres. what is
it?

When I tried using the default settings my disk space was being used
twice as normal.

I am using a RAID 5 shared storage device (iSCSI) with the stripe
size of 64KB - what should I choose?

-- 
Best regards,
Arkadiy mailto:eth@ethaniel.com


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Arkadiy Kulev wrote:
> Hello ocfs2-users,
>
>   I have 2 questions:
>
>   1. I forgot the block size and cluster size that I chose
>   during formatting of the drive. Is there any way I can find it out
>   afterwards?
>
>   
# debugfs.ocfs2 -R "stats" /dev/sdX
Look for Cluster Size bits and Block Size bits.
9 = 512
10 = 1K
...
16 = 4K
...
20 = 1M
>   2. And what's up with the block size-cluster size anyways? I could
>   find any in-depth information regarding those parametres. what is
>   it?
>   
Refer to the FAQ. For more, look at the on-disk-format support guide.
>   When I tried using the default settings my disk space was being used
>   twice as normal.
>   
>   I am using a RAID 5 shared storage device (iSCSI) with the stripe
>   size of 64KB - what should I choose?
>
>