linux-kernel - SATA hotplug device renaming and dmraid...

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Message-ID: <20080520201157.21c31481@tux.DEF.witbe.net>
Date:	Tue, 20 May 2008 20:11:57 +0200
From:	Paul Rolland <rol@...917.net>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	rol@...917.net
Subject: SATA hotplug device renaming and dmraid...

Hello,

I'm using a machine that supports SATA hotplug and with and Intel ESB2
(Fake)Raid controller.
I've configured a raid1 (mirror) array using dmraid, that is made of 
/dev/sda and /dev/sdb, and seen by the OS as /dev/mapper/isw_xxxxxxx_RAID1

My problem is that when I unplug and replug a disk, it is assigned a 
new name (/dev/sdc first time as this is the first name available), and
so it is no more considered as being part of the RAID array.

Is this an expected behavior ? Is there a way (using dmraid/dmsetup) to
instruct kernel of the changes ? 

It seems that udev can get events from device-mapper, from
Documentations/device-mapper/dm-xxxx.txt, but I don't really see how to use
this to notify of a disk change in the array...

Regards,
Paul
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