On Tue, 2019-08-27 at 12:28 +0000, Chongyun Wu wrote: > Hi Martin and Ben, > > Cloud you help to view below patch, thanks. > > From a7126e33e7eff8a985600b41b1723ee66b183586 Mon Sep 17 00:00:00 > 2001 > From: Chongyun Wu <wu.chongyun@xxxxxxx> > Date: Tue, 27 Aug 2019 10:23:50 +0800 > Subject: [PATCH] multipathd: "san_path_err" failure optimization > > Let san_path_err_recovery_time path unstable can be > detected and not reinstate it until this path keep up in > san_path_err_recovery_time. It will fix heavy IO delay > caused by parts of paths state shaky in multipath device. > > Test and result: > Run up eth1 30s and down eth1 30s with 100 loops script to > make some paths shaky in each multipath devices. > Using below multipath.conf configure in defaults section: > san_path_err_recovery_time 30 > san_path_err_threshold 2 > san_path_err_forget_rate 6 > After test, not found any IO delay logs except several logs in the > very > beginning which before san_path_err filter shaky path works . > If without above config and this patch there will be lots of IO delay > in syslog and some paths state change from up to down again and > again. > > Signed-off-by: Chongyun Wu <wu.chongyun@xxxxxxx> > --- > multipathd/main.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > Hello Chongyun, Your patch makes sense to me. Ben has worked much more than myself on marginal paths recently, so I'd want to see his opinion, too. Regards, Martin -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
