From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Vanns Date: Mon, 13 May 2013 14:19:38 +0100 (BST) Subject: [Lustre-devel] Export over NFS sets rsize to 1MB? In-Reply-To: <1212911910.19338063.1368451002112.JavaMail.root@framestore.com> Message-ID: <1975652007.19339235.1368451178426.JavaMail.root@framestore.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lustre-devel@lists.lustre.org Hello dev list. Apologies for a post to perhaps the wrong group but I'm having a bit of difficulty locating any document or wiki describing how and/or where the preferred read and write block size for NFS exports of a Lustre filesystem are set to 1MB? Basically we have two Lustre filesystems exported over NFSv3. Our lustre block size is 4k and the max r/w size is 1MB. Without any special rsize/wsize options set for the export the default one suggested to clients (MOUNT->FSINFO RPC) as the preferred size is set to 1MB. How does Lustre figure this out? Other non-Lustre exports are generally much less; 4, 8, 16 or 32 kilobytes. Any hints would be appreciated. Documentation or code paths welcome as are annotated /proc locations. Thanks, Jim PS. This is Lustre 1.8.8 on Linux 2.6.32 -- Jim Vanns Senior Software Developer Framestore