2.4TB disk - MBR and GPT coexist?

[Charles Sprickman]

On Fri, 12 Jan 2007, Jan Mikkelsen wrote:

> Hi,
>
> Jo Rhett wrote:
>>> On Thu, 11 Jan 2007 13:56:43 -0800 Jo Rhett <jrhett at svcolo.com> wrote:
>>>> Thanks for the reply.  The problem is that I have a single 6-drive
>>>> (550gb/ea) RAID-5 array.  If I split two disks off to make a RAID-1
>>>> boot device, I'll lose 1TB of usable storage.
>> 
>> On Jan 11, 2007, at 3:55 PM, Torfinn Ingolfsen wrote:
>>> Hmm, why can't you just make your controller create two logical arrays
>>> onto the one physical array? Doesnt the controller support this  feature?
>> 
>> Not any one that I've ever seen in commodity disks.  Yes, on big  fiber 
>> channel disk cabinets.  No to 6-8 drive raid controllers.
>
> I'd be very surprised if you can't.  You can certainly do it with Areca 
> (arcmsr(4)), HP (ciss(4)), IBM ServeRAID (ips(4)), although the details vary.

I can confirm 3Ware controllers also work that way.

Charles

> For example, on an Areca 8 port controller, I have 8 disks in a RAID-6 array, 
> and within that "RAID set", I have three volumes.  The three volumes appear 
> to FreeBSD as da0, da1 and da2, respectively.
>
> CLI> rsf info
> Num Name             Disks TotalCap  FreeCap DiskChannels       State
> ===============================================================================
> 1  Raid Set # 00        8 2560.0GB    0.0GB 12345678           Rebuilding
> ===============================================================================
> GuiErrMsg<0x00>: Success.
>
> CLI> vsf info
> # Name             Raid# Level   Capacity Ch/Id/Lun  State
> ===============================================================================
> 1 ARC-1220-VOL#00    1   Raid6     81.0GB 00/00/00   Rebuilding(63.8%)
> 2 ARC-1220-VOL#01    1   Raid6   1000.0GB 00/01/00   Need Rebuild
> 3 ARC-1220-VOL#02    1   Raid6    839.0GB 00/02/00   Need Rebuild
> ===============================================================================
> GuiErrMsg<0x00>: Success.
>
>
> Regards,
>
> Jan Mikkelsen 
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