From mboxrd@z Thu Jan 1 00:00:00 1970 From: Malahal Naineni Subject: Re: General and configuration questions Date: Fri, 28 May 2010 18:46:59 -0700 Message-ID: <20100529014659.GA1852@us.ibm.com> References: <230ED15F81AFD3409345FFA4E565F0E50A978AA3@NDHV3000.na.corp.mckesson.com> <20100528221325.GA29567@us.ibm.com> <230ED15F81AFD3409345FFA4E565F0E50A978B57@NDHV3000.na.corp.mckesson.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <230ED15F81AFD3409345FFA4E565F0E50A978B57@NDHV3000.na.corp.mckesson.com> 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 Allen, Jack [Jack.Allen@mckesson.com] wrote: > > Thanks for the quick reply. > > Then I lowered rr_min_io to 10 and did reconfigure and show > config and the parameter does not show up at all. The device entry is > still at the top of the devices, just does not have the rr_min_io > parameter at all. So I went through several values for rr_min_io stating > at 100 and decreasing it by 10 each time and then doing reconfigure and > show config. When it got to 10 again the parameter did not show up. So I > increased it to 11 and it showed up. So there must be some min/max value > that multipath will not allow setting the parameter to and if it is not > within that range, it just ignores it all together. You could have used binary search. :-) Not sure if such a value is not used or not displayed in in "show config" You can do "multipath -v4" that should display what value is used for your device while creating it though. I always use 'multipath -v4' to see what settings are done for my devices if I change something in multipath.conf. Hope that helps! --Malahal.