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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Tue, 15 Dec 2020 12:47:14 -0600
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Subject: [PATCH] multipath.conf.5: Improve checker_timeout description
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I was asked to explain how checker_timeout works for checkers like
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directio, that don't issue scsi commands with an explicit timeout
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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multipath/multipath.conf.5 | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
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index 60954574..a5686090 100644
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--- a/multipath/multipath.conf.5
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+++ b/multipath/multipath.conf.5
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@@ -634,8 +634,13 @@ The default is: \fBno\fR
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.
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.TP
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.B checker_timeout
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-Specify the timeout to use for path checkers and prioritizers that issue SCSI
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-commands with an explicit timeout, in seconds.
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+Specify the timeout to use for path checkers and prioritizers, in seconds.
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+Only prioritizers that issue scsi commands use checker_timeout. Checkers
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+that support an asynchronous mode (\fItur\fR and \fIdirectio\fR), will
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+return shortly after being called by multipathd, regardless of whether the
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+storage array responds. If the storage array hasn't responded, mulitpathd will
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+check for a response every second, until \fIchecker_timeout\fR seconds have
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+elapsed.
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.RS
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.TP
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The default is: in \fB/sys/block/sd<x>/device/timeout\fR
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--
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2.17.2
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