From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zdenek Kabelac <zkabelac@redhat.com>
Subject: Re: sg_persist triggers block kernel event ???
Date: Sun, 04 May 2014 18:57:54 +0200
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To: device-mapper development <dm-devel@redhat.com>, christophe.varoqui@opensvc.com
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Dne 3.5.2014 22:12, Christophe Varoqui napsal(a):
> Hi list,
>
> I observe this on a debian 7.5 server with a udevadm monitor running in the
> background :
>
> # sg_persist -n -k /dev/sdbh
>    PR generation=0x0, there are NO registered reservation keys
>

Whoever opens   device in 'read-write' mode  and then closes device triggers 
udev change event. (udev rescans whatever has changed on device after this)

That's how it works for many years already.
It's not a bug and some even says it's a feature....

Zdenek