Re: disable creation of md127

["Patrick H." <linux-raid@feystorm.net>]

Sent: Fri Dec 10 2010 15:36:01 GMT-0700 (Mountain Standard Time)
From: Patrick H. <linux-raid@feystorm.net>
To: linux-raid@vger.kernel.org
Subject: Re: disable creation of md127
> Sent: Fri Dec 10 2010 14:58:59 GMT-0700 (Mountain Standard Time)
> From: Neil Brown <neilb@suse.de>
> To: Patrick H. <linux-raid@feystorm.net> linux-raid@vger.kernel.org
> Subject: Re: disable creation of md127
>> On Fri, 10 Dec 2010 14:38:30 -0700 "Patrick H." 
>> <linux-raid@feystorm.net>
>> 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
>>
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>>   
> Youre right. I removed every single md-related init script so I didnt 
> think mdadm was doing it. But apparently I forgot about udev. I 
> replaced mdadm with a script to dump out a bunch of info and found 
> that udev is calling `mdadm -I /dev/sdb1`. Any idea where this might 
> be configured at? I did a recursive grep for 'mdadm' in the entire 
> /etc and found nothing but init scripts and a little selinux stuff  
> (nothing in /etc/udev).
>
> -Patrick
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Nevermind, found it. /lib/udev/rules.d/65-md-incremental.rules
Thanks for pointing me back at mdadm (had ruled it out after I removed 
the init scripts) :-)