2.4TB disk - MBR and GPT coexist?

Freddie Cash fcash at ocis.net
Fri Jan 12 07:26:43 UTC 2007

On Thu, January 11, 2007 10:00 pm, Charles Sprickman wrote:
> On Thu, 11 Jan 2007, Jo Rhett wrote:
>>>>> 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.
>> On Jan 11, 2007, at 8:02 PM, Charles Sprickman wrote:
>>> I can confirm 3Ware controllers also work that way.
>> Please enlighten me.  I see no such options in the BIOS menu.
> I've done it in 3DM2, but look at pages 23+24 (printed page numbers)
> here and the stuff regarding setting up a seperate boot volume:
> http://www.3ware.com/support/UserDocs/3ware9590SEUsrGuide.pdf

>From page 130 of that manual:
Boot volume size
When you create a unit through 3BM, you can create a special volume to
function as the boot volume. You specify the size you want this volume
to be.

This is useful if you will be installing an operating system onto the
unit, and want it to be installed in one volume and have a separate
volume for data.

This is an optional feature. You do not have to create a boot volume
if you plan to install the operating system on the unit.

If you are creating a very large unit (2 TB or greater) and have
enabled the Auto-Carving policy, the boot volume will be created in
addition to any volumes created through auto-carving. For more
information about auto-carving, see “Using Auto-Carving for Multi LUN
Support” on page 121.

This feature is only available on 9550SX and 9590SE controllers, and can
only be specified in 3BM.
Note that last line.  This appears to be a very recent addition to the
3Ware controllers (and something I wish I had noticed sooner, when
configuring our 9550SX-12 controllers with 12x400 GB disks).

Freddie Cash
fcash at ocis.net

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