[Ocfs2-users] ocfs2 hangs during webserver usage

[Luis Freitas]

Sunil,

  Hmm, I thought you meant the cluster size.

Regards,
Luis 

--- On Wed, 1/28/09, Sunil Mushran <sunil.mushran at oracle.com> wrote:
From: Sunil Mushran <sunil.mushran at oracle.com>
Subject: Re: [Ocfs2-users] ocfs2 hangs during webserver usage
To: lfreitas34 at yahoo.com
Cc: ocfs2-users at oss.oracle.com
Date: Wednesday, January 28, 2009, 1:08 AM

Luis Freitas wrote:
>    The extent size would play a role on this also, as Sunil pointed. You
could check if the extent size is different on your test environment. The mkfs
tool might have defaulted a larger extent size if the total size of the
filesystem is larger. (Sunil, correct me on this if I am wrong).

The extend size I was referring to is not related to any ondisk size.
It depends on the location the write() is issued to. Say you have a
100K sized file and you issue a write() at offset 1G. If the fs supports
sparse files, it will allocate (and init) blocks only around the 1G location,
leaving a hole in between. A non-sparsefile supporting fs, on the other hand,
will need to allocate (and init) the entire space between 100K and 1G.




      
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