Is there a size limit of natacontrol?

Zenny garbytrash at
Tue Feb 28 11:17:59 PST 2012

Thanks for the patch. I will check how it will go. ;-)

On 2/28/12, Francois Tigeot <ftigeot at> wrote:
> Hi,
> On Mon, Feb 27, 2012 at 12:28:00PM +0000, Alex Hornung wrote:
>> On 27/02/12 12:20, Zenny wrote:
>> > I tried to create a RAID10 with natacontrol with 4 2TB HDDs, but it
>> > only shows 2TB (1718306MB) size of ar0 created instead of 4TB.
>> In principle there is no such limit that I'm aware of, apart from the
>> MBR partition size limit. It all depends where you are seeing those 2
>> TB. If it's a partition size, try using GPT.
> Nataraid itself doesn't seem to be limited to 2TB RAID volumes but some
> of the on-disk metadata format it uses are.
> By default, when no BIOS-created metadata is recognized, natacontrol
> creates a volume using the Promise metadata format -- and this one has
> an inherent limit of 32-bit disk sectors.
> The Intel MatrixRAID format moves this limit to 64-bit sectors, way
> beyond the 2TB barrier.
> The attached patch changes nataraid to use it by default instead of the
> Promise format. It _could_ allow the creation of > 2TB RAID volumes on
> unrecognized controllers.
> --
> Francois Tigeot

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