From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mauricio Faria de Oliveira Subject: Re: Can anyone help me understand what is going wrong with a dm-multipah config I have? Date: Mon, 25 Jan 2016 11:23:34 -0200 Message-ID: <56A621D6.5090909@linux.vnet.ibm.com> References: Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com List-Id: dm-devel.ids On 11/18/2015 02:55 PM, Richard Sharpe wrote: > Why does dm-multipath not switch to using the alternate paths? I seem to recall one case where the iSCSI-related timeouts were not set to lower values, for multipathing. So, failover took more time than expected (ending up in the default value of 120 seconds iirc). It was documented in the open-iscsi readme, section 8 advanced config (includes topics for multipath configurations). Additional references: [1] https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/iscsi-replacements_timeout.html [2] https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/iscsi-modifying-link-loss-behavior-dmmultipath.html Hope this helps, -- Mauricio Faria de Oliveira IBM Linux Technology Center