Hello,<div><br></div><div>I&#39;m looking for a FS in Linux that supports concurrent direct IO write. </div><div>ext4 supports concurrent direct IO read if we mount it with dioread_nolock, but doesn&#39;t support concurrent writes. XFS doesn&#39;t support concurrent direct IO at all. It locks the inode exclusive if it&#39;s direct IO. I tried btrfs, and it seems it doesn&#39;t support concurrent direct IO either though I haven&#39;t looked into its code. </div>
<div>Is there a local FS that support concurrent direct IO write? It seems NFS supports it (<a href="http://kevinclosson.wordpress.com/2011/08/12/file-systems-for-a-database-choose-one-that-couples-direct-io-and-concurrent-io-whats-this-have-to-do-with-nfs-harken-back-5-2-years-to-find-out/">http://kevinclosson.wordpress.com/2011/08/12/file-systems-for-a-database-choose-one-that-couples-direct-io-and-concurrent-io-whats-this-have-to-do-with-nfs-harken-back-5-2-years-to-find-out/</a>), but I&#39;m looking for local FS.</div>
<div><br></div><div>Thanks,</div><div>Da</div>