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From: Benjamin Marzinski <bmarzins@redhat.com>
To: Christophe Varoqui <christophe.varoqui@opensvc.com>
Cc: device-mapper development <dm-devel@redhat.com>,
	Martin Wilck <Martin.Wilck@suse.com>
Subject: [dm-devel] [PATCH 6/6] multipath.conf.5: Improve checker_timeout description
Date: Fri, 18 Dec 2020 17:06:42 -0600	[thread overview]
Message-ID: <1608332802-9720-7-git-send-email-bmarzins@redhat.com> (raw)
In-Reply-To: <1608332802-9720-1-git-send-email-bmarzins@redhat.com>

I was asked to explain how checker_timeout works for checkers like
directio, that don't issue scsi commands with an explicit timeout

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
 multipath/multipath.conf.5 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
index ea66a01e..c7c4184b 100644
--- a/multipath/multipath.conf.5
+++ b/multipath/multipath.conf.5
@@ -639,8 +639,13 @@ The default is: \fBno\fR
 .
 .TP
 .B checker_timeout
-Specify the timeout to use for path checkers and prioritizers that issue SCSI
-commands with an explicit timeout, in seconds.
+Specify the timeout to use for path checkers and prioritizers, in seconds.
+Only prioritizers that issue scsi commands use checker_timeout. Checkers
+that support an asynchronous mode (\fItur\fR and \fIdirectio\fR), will
+return shortly after being called by multipathd, regardless of whether the
+storage array responds. If the storage array hasn't responded, mulitpathd will
+check for a response every second, until \fIchecker_timeout\fR seconds have
+elapsed.
 .RS
 .TP
 The default is: in \fB/sys/block/sd<x>/device/timeout\fR
-- 
2.17.2

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  parent reply	other threads:[~2020-12-18 23:07 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-18 23:06 [dm-devel] [PATCH 0/6] More misc multipath patches Benjamin Marzinski
2020-12-18 23:06 ` [dm-devel] [PATCH 1/6] mpathpersist: Fix Register and Ignore with 0x00 SARK Benjamin Marzinski
2020-12-18 23:18   ` Martin Wilck
2020-12-18 23:06 ` [dm-devel] [PATCH 2/6] mpathpersist: update prkeys file on changing registrations Benjamin Marzinski
2020-12-18 23:23   ` Martin Wilck
2020-12-18 23:06 ` [dm-devel] [PATCH 3/6] libmultipath: warn about missing braces at end of multipath.conf Benjamin Marzinski
2020-12-18 23:28   ` Martin Wilck
2020-12-18 23:06 ` [dm-devel] [PATCH 4/6] libmultipath: ignore multipaths sections without wwid option Benjamin Marzinski
2020-12-18 23:30   ` Martin Wilck
2021-01-04 19:24     ` Benjamin Marzinski
2020-12-18 23:06 ` [dm-devel] [PATCH 5/6] multipathd: Fix multipathd stopping on shutdown Benjamin Marzinski
2020-12-18 23:31   ` Martin Wilck
2021-01-27  1:16     ` Benjamin Marzinski
2021-01-27  9:41       ` Martin Wilck
2020-12-18 23:06 ` Benjamin Marzinski [this message]
2020-12-18 23:56   ` [dm-devel] [PATCH 6/6] multipath.conf.5: Improve checker_timeout description Martin Wilck
2021-01-05  0:33     ` Benjamin Marzinski
2021-01-05 10:55       ` Martin Wilck

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