Re: [Ocfs2-users] Concurrent write performance issues with OCFS2

2012-02-28 Thread Erik Schwartz
Thanks for your reply. On 2/28/12 4:37 PM, Sunil Mushran wrote: > In 1.4, the local allocator window is small. 8MB. Meaning the node > has to hit the global bitmap after every 8MB. In later releases, the > window is much larger. > At the moment, the OCFS2 project page (http://oss.oracle.com/pro

Re: [Ocfs2-users] Concurrent write performance issues with OCFS2

2012-02-28 Thread Sunil Mushran
In 1.4, the local allocator window is small. 8MB. Meaning the node has to hit the global bitmap after every 8MB. In later releases, the window is much larger. Second, a single node is not a good baseline. A better baseline is multiple nodes writing concurrently to the block device. Not fs. Use dd.

[Ocfs2-users] Concurrent write performance issues with OCFS2

2012-02-28 Thread Erik Schwartz
I have a two-node RHEL5 cluster that runs the following Linux kernel and accompanying OCFS2 module packages: * kernel-2.6.18-274.17.1.el5 * ocfs2-2.6.18-274.17.1.el5-1.4.7-1.el5 A 2.5TB LUN is presented to both nodes via DM-Multipath. I have carved out a single partition (using the entire LUN