[Lustre-discuss] Enabling mds failover after filesystem creation
Greetings, I am attempting to add mds failover operation to an existing v1.8.4 filesystem. I have heartbeat/stonith configured on the mds nodes. What is unclear is what to change in the lustre parameters. I have read over the 1.8.x and 2.0 manuals and they are unclear as exactly how to enable failover mds operation on an existing filesystem. Do I simply run the following on the primary mds node and specify the NID of the secondary mds node? tunefs.lustre --param=failover.node=10.0.1.3@o2ib /dev/mdt device where: 10.0.1.2=primary mds, 10.0.1.3=secondary mds All of the examples for enabling failover via tunefs.lustre are for OSTs and I want to be sure that there isn't a different procedure for the MDS since it can only be active/passive. Thanks, --Jeff -- Jeff Johnson Aeon Computing www.aeoncomputing.com 4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117 ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
Re: [Lustre-discuss] Enabling mds failover after filesystem creation
It depends - are you using a combined MGS/MDS? If so, you will have to update the mgsnid on all servers to reflect the failover node, plus change the client mount string to show the failover node. otherwise, it's the same procedure as with an OST. cliffw On Tue, Jun 14, 2011 at 12:06 PM, Jeff Johnson jeff.john...@aeoncomputing.com wrote: Greetings, I am attempting to add mds failover operation to an existing v1.8.4 filesystem. I have heartbeat/stonith configured on the mds nodes. What is unclear is what to change in the lustre parameters. I have read over the 1.8.x and 2.0 manuals and they are unclear as exactly how to enable failover mds operation on an existing filesystem. Do I simply run the following on the primary mds node and specify the NID of the secondary mds node? tunefs.lustre --param=failover.node=10.0.1.3@o2ib /dev/mdt device where: 10.0.1.2=primary mds, 10.0.1.3=secondary mds All of the examples for enabling failover via tunefs.lustre are for OSTs and I want to be sure that there isn't a different procedure for the MDS since it can only be active/passive. Thanks, --Jeff -- Jeff Johnson Aeon Computing www.aeoncomputing.com 4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117 ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss -- cliffw Support Guy WhamCloud, Inc. www.whamcloud.com ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
Re: [Lustre-discuss] Enabling mds failover after filesystem creation
Apologies, I should have been more descriptive. I am running a dedicated MGS node and MGT device. The MDT is a standalone RAID-10 shared via SAS between two nodes, one being the current MDS and the second being the planned secondary MDS. Heartbeat and stonith w/ ipmi control is currently configured but not started between the two nodes. On 6/14/11 12:12 PM, Cliff White wrote: It depends - are you using a combined MGS/MDS? If so, you will have to update the mgsnid on all servers to reflect the failover node, plus change the client mount string to show the failover node. otherwise, it's the same procedure as with an OST. cliffw On Tue, Jun 14, 2011 at 12:06 PM, Jeff Johnson jeff.john...@aeoncomputing.com mailto:jeff.john...@aeoncomputing.com wrote: Greetings, I am attempting to add mds failover operation to an existing v1.8.4 filesystem. I have heartbeat/stonith configured on the mds nodes. What is unclear is what to change in the lustre parameters. I have read over the 1.8.x and 2.0 manuals and they are unclear as exactly how to enable failover mds operation on an existing filesystem. Do I simply run the following on the primary mds node and specify the NID of the secondary mds node? tunefs.lustre --param=failover.node=10.0.1.3@o2ib /dev/mdt device where: 10.0.1.2=primary mds, 10.0.1.3=secondary mds All of the examples for enabling failover via tunefs.lustre are for OSTs and I want to be sure that there isn't a different procedure for the MDS since it can only be active/passive. Thanks, --Jeff -- Jeff Johnson Aeon Computing www.aeoncomputing.com http://www.aeoncomputing.com 4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117 ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org mailto:Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss -- cliffw Support Guy WhamCloud, Inc. www.whamcloud.com http://www.whamcloud.com -- Jeff Johnson Aeon Computing www.aeoncomputing.com 4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117 ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
Re: [Lustre-discuss] Enabling mds failover after filesystem creation
Then it should be the same as the OST case. The only difference between the two is that we never allow two active MDSs on the same filesystem, so MDT is always active/passive. cliffw On Tue, Jun 14, 2011 at 12:18 PM, Jeff Johnson jeff.john...@aeoncomputing.com wrote: Apologies, I should have been more descriptive. I am running a dedicated MGS node and MGT device. The MDT is a standalone RAID-10 shared via SAS between two nodes, one being the current MDS and the second being the planned secondary MDS. Heartbeat and stonith w/ ipmi control is currently configured but not started between the two nodes. On 6/14/11 12:12 PM, Cliff White wrote: It depends - are you using a combined MGS/MDS? If so, you will have to update the mgsnid on all servers to reflect the failover node, plus change the client mount string to show the failover node. otherwise, it's the same procedure as with an OST. cliffw On Tue, Jun 14, 2011 at 12:06 PM, Jeff Johnson jeff.john...@aeoncomputing.com wrote: Greetings, I am attempting to add mds failover operation to an existing v1.8.4 filesystem. I have heartbeat/stonith configured on the mds nodes. What is unclear is what to change in the lustre parameters. I have read over the 1.8.x and 2.0 manuals and they are unclear as exactly how to enable failover mds operation on an existing filesystem. Do I simply run the following on the primary mds node and specify the NID of the secondary mds node? tunefs.lustre --param=failover.node=10.0.1.3@o2ib /dev/mdt device where: 10.0.1.2=primary mds, 10.0.1.3=secondary mds All of the examples for enabling failover via tunefs.lustre are for OSTs and I want to be sure that there isn't a different procedure for the MDS since it can only be active/passive. Thanks, --Jeff -- Jeff Johnson Aeon Computing www.aeoncomputing.com 4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117 ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss -- cliffw Support Guy WhamCloud, Inc. www.whamcloud.com -- Jeff Johnson Aeon Computing www.aeoncomputing.com 4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117 ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss -- cliffw Support Guy WhamCloud, Inc. www.whamcloud.com ___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
