From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Liu Date: Wed, 03 Jul 2013 13:06:43 +0800 Subject: [Ocfs2-devel] why oracle give up dlm by disk on ocfs2? because performance? In-Reply-To: <51D37DF0.1010704@huawei.com> References: <51CE541B.4070807@huawei.com> <51D22B4E.6020406@huawei.com> <51D235F8.1040503@huawei.com> <20130702172030.GF32502@wotan.suse.de> <51D37DF0.1010704@huawei.com> Message-ID: <51D3B163.4000308@oracle.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ocfs2-devel@oss.oracle.com On 07/03/2013 09:27 AM, Jensen wrote: > On 2013/7/3 1:20, Mark Fasheh wrote: > >> On Tue, Jul 02, 2013 at 10:07:52AM +0800, Jensen wrote: >>> On 2013/7/2 9:35, Sunil Mushran wrote: >>> >>>> A general purpose file system requires one to manage over a million locks concurrently. So performance is the main reason. >>>> >>> >>> Thanks for your comments. >>> >>> Has Oracle compared the performance between ocfs2 and ocfs1? >> >> Firstly, that's implied in the answer you just got. Also, who wouldn't >> compare performance from one version of a file system to the next? >> >> Can you please cut to the chase and either ask what you really want to know >> or make the statement you're trying to make so we can move on? >> > > > Thanks for your answer. > we want to use compare and write scsi command to replace DLM module. it is similar > with vmware vmfs. > I'm not trying to answer this question. I knew that OCFS2 is deployed in HuaWei.com in a large-scale cluster up to 128 nodes, so I'm not very much surprised at something you mentioned below, but... > why we want to replace dlm in ocfs2? because: > 1. The stability of ocfs2 dlm is very poor, we found 100+ bug. That sounds interesting, how to classify those problems? - Fatal error, panic - Result in an interruption in service - Wrong results, but can work around? - Trivial Reporting bugs to bugzilla/OCFS2 would be useful to keep track of them: https://oss.oracle.com/bugzilla/ Thanks, -Jeff > 2. The Reliability of ocfs2 dlm is very poor, especially in network split, the > worse case split two domain, the half of node must be reboot. > 3. the maximum number of mounted machine is 32, we want to support more. > > currently we worry about two thing: > 1. The performance lock and unlock. because it use the scsi command and it is similar with IO read and write. > 2. The change is very very large. because it maybe modify the disk layout of ocfs2. > > so anyone interested with this? > >> Thanks, >> --Mark >> >> -- >> Mark Fasheh >> >> > > > > > _______________________________________________ > Ocfs2-devel mailing list > Ocfs2-devel at oss.oracle.com > https://oss.oracle.com/mailman/listinfo/ocfs2-devel