Hi,
On 12/01/2009 06:24 AM, narendra babu wrote:
Hello Friends
I would like to know How does Direct io work on ext3?
The linux kernel has a higher level API called AIO which abstracts out the
filesystem implementation.
http://lse.sourceforge.net/io/aio.html
Does it also support Concurrent IO and Asynchronous IO?
I don't understand what those terms mean to you. Is there a standard definition
of the difference between concurrent and asynchronous IO in this context ?
also What is default file system cache size for ext3?
Again, linux has a filesystem independent cache implementation for data as well
as meta-data (viz inodes) known as the buffer cache. The buffer cache size can
be seen using the command 'free' and can be tuned using sysctl parameters (these
are dependent on your kernel version, since they have gone through several
revisions over 2.4 and 2.6 releases).
A broad overview of the FS abstraction offered by the linux kernel:
http://www.ibm.com/developerworks/linux/library/l-linux-filesystem/
cheers,
- steve
--
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