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Date:      Mon, 28 May 2007 00:11:24 +0200
From:      Gabriel Rossetti <mailing_lists@evotex.ch>
To:        Jerry McAllister <jerrymc@msu.edu>
Cc:        kalin@el.net, "illoai@gmail.com" <illoai@gmail.com>, freebsd-questions@freebsd.org
Subject:   Re: raid or not raid
Message-ID:  <465A020C.8020207@evotex.ch>
In-Reply-To: <20070524163311.GF4322@gizmo.acns.msu.edu>
References:  <54316.74.2.36.140.1179892303.squirrel@mail.el.net>	<61733.74.64.6.149.1180002606.squirrel@mail.el.net>	<d7195cff0705240407w50617086i6ebbdfc4b9eaeac1@mail.gmail.com> <20070524163311.GF4322@gizmo.acns.msu.edu>

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Jerry McAllister wrote:
> On Thu, May 24, 2007 at 06:07:58AM -0500, illoai@gmail.com wrote:
>
>   
>> On 24/05/07, kalin mintchev <kalin@el.net> wrote:
>>     
>>> so nobody on this list knows anything about raid?
>>> wrong list?
>>>
>>>       
>>>> hi all..
>>>>
>>>> i have a box in a remote hosting facility that claims that the machine 
>>>>         
>>> has
>>>       
>>>> two discs raided in it but df and fstab show only one disc with a bunch 
>>>>         
>>> of
>>>       
>>>> slices.
>>>> under devices there is another name - ad6 - but it's not mounted 
>>>>         
>>> anywhere.
>>>       
>>>> the one i see both in df and the fstab is ad4 with one big slice and
>>>> different partitions....
>>>>
>>>> they insist there are 2 raided discs in tha machine. the os is 5.4 and i
>>>> think at that point the raid drivers were still considered 
>>>>         
>>> 'experimental'.
>>>       
>>>> it makes sense to me that if i don't see a second drive in the fstab 
>>>>         
>>> there
>>>       
>>>> isn;t any mounting which means that there is no raid going on...
>>>>
>>>> is there any other way i can make sure if raid is actually on?
>>>> would there will be any logs somewhere?
>>>> the machine has been up for about 2 years and the dmesg is long gone...
>>>>
>>>> thanks.....
>>>>
>>>>         
>> Lots of people here know plenty about RAID,
>> but you don't provide very much information.
>>
>> If dmesg itself returns none of the startup info,
>> you can look in /var/log/dmesg.[today|yesterday].
>>
>> /usr/sbin/pciconf can tell you what controller(s)
>> may be attached.
>>
>> A proper RAID will show up as a single device,
>> just like any hard drive (but different).
>>
>> It does seem odd to me that a (supposed) RAID
>> would show up as /dev/ad4.
>>     
>
> A hardware raid will look like any other drive to the system.
> If it is SATA raid, it should be adN
> It is it SAS raid, it should be daN.
>
>   
I have an SATA RAID controller (rocketraid 1640) and the drive shows up
as daN and not adN
When I tested the controller without the driver loaded the DRIVES showed
up ad adN, I put
drives in caps because this is what I think is happening here, the
driver isn't loaded and/or no
RAID devices were created, so the RAID controller's drives just show up
as drives and the
controller is just used as a non-RAID controller. I suspect this is why
he sees a second disk.

Gabriel
> Some systems allow you to address the drives as either individual
> drives or as the raid - maybe until you have configured it or
> something.   Anyway, on a Dell 2950 I could see both designations
> but figured out which was the raid and used it and all was fine.
>
> ////jerry
>
>   
>> Possibilities:
>> Your RAID really is on /dev/ad4 and /dev/ad6 is
>> something unexplained.
>> Your RAID controller is unsupported in 5.x and
>> not Doing The Right Thing but somehow still (kind
>> of) working as a normal [S]ATA controller.
>> Your RAID controller is unsupported in 5.x and
>> your hosting company realised this and wired
>> the shebang up as a normal [S]ATA controller
>> because they couldn't get FreeBSD to install
>> otherwise.
>> There is a RAID controller and there are two disks
>> connected to it, but the controller was not set up
>> correctly.
>> There is a RAID controller and there are two disks
>> connected to some other controller which might lead
>> to some interesting phone calls.
>> Your remote hosting company put a RAID with two
>> disks in some random machine and someone else
>> is complaining on some other list about the inverse
>> of your problem.
>>
>> -- 
>> --
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>>     
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>   




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