From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Benjamin Marzinski" Subject: Re: deterministic io throughput in multipath Date: Wed, 21 Dec 2016 10:09:40 -0600 Message-ID: <20161221160940.GG19659@octiron.msp.redhat.com> References: <1649d4b8538d4b4cb1efacdfe8cf31eb@BRMWP-EXMB12.corp.brocade.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: <1649d4b8538d4b4cb1efacdfe8cf31eb@BRMWP-EXMB12.corp.brocade.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: Muneendra Kumar M Cc: "dm-devel@redhat.com" List-Id: dm-devel.ids Have you looked into the delay_watch_checks and delay_wait_checks configuration parameters? The idea behind them is to minimize the use of paths that are intermittently failing. -Ben On Mon, Dec 19, 2016 at 11:50:36AM +0000, Muneendra Kumar M wrote: > Customers using Linux host (mostly RHEL host) using a SAN network for > block storage, complain the Linux multipath stack is not resilient to > handle non-deterministic storage network behaviors. This has caused ma= ny > customer move away to non-linux based servers. The intent of the below > patch and the prevailing issues are given below. With the below design= we > are seeing the Linux multipath stack becoming resilient to such network > issues. We hope by getting this patch accepted will help in more Linux > server adoption that use SAN network. > = > I have already sent the design details to the community in a different > mail chain and the details are available in the below link. > = > [1]https://www.redhat.com/archives/dm-devel/2016-December/msg00122.htm= l. > = > Can you please go through the design and send the comments to us. =A0 > = > =A0 > = > Regards, > = > Muneendra. > = > =A0 > = > =A0 > = > References > = > Visible links > 1. https://www.redhat.com/archives/dm-devel/2016-December/msg00122.html > -- > dm-devel mailing list > dm-devel@redhat.com > https://www.redhat.com/mailman/listinfo/dm-devel