From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Brown Subject: Re: disable creation of md127 Date: Sat, 11 Dec 2010 08:58:59 +1100 Message-ID: <20101211085859.55d0f889@notabene.brown> References: <4D029DD6.5070705@feystorm.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4D029DD6.5070705@feystorm.net> Sender: linux-raid-owner@vger.kernel.org To: "Patrick H." Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, 10 Dec 2010 14:38:30 -0700 "Patrick H." wrote: > How can I prevent the MD driver from auto-creating md127 on boot? > I have a server which is exporting /dev/sdb1 via iSCSI. The remote > client for this device is using it in a raid device so it has raid > metadata on it. However because of this, when the target server boots > up, the md driver shoves it into md127. And because of this, the iSCSI > target daemon (tgtd) wont export the device as its now part of a raid > device. > The partition type is 0x83, not 0xfd. > > RHEL6 2.6.32-71 The md driver isn't auto-creating this. mdadm is being run and being asked to create this, possibly implicitly. Exactly how you stop this from happening depends on where it is an initrd script or a boot script that is doing it, and which version of mdadm you have. If you have 3.0 or later, then putting AUTO -all in mdadm.conf might be enough. If you have a 2.x, you probably need to tell the init script not to run mdadm, maybe edit the script, maybe set some default variable. I know little about RHEL and so cannot suggest specifics. NeilBrown