howto create partitions bigger than 2TB

howto create partitions bigger than 2TB

[Ingo Freund]

Hi

I've got a RAID5 (driver aacraid for an ICP9047MA) with four
750GB hdds which provides a 2.25TB sized device.
None of the until now used tools will work with that device.
fdisk complains about missing cylinder count.
cfdisk misses the device size.
parted shows the right device size but only creates a partion
with 51GB.
What am I supposed to do to work with this device?
Which fs can handle it?
(CONFIG LARGE BLOCK is on)
We are talking about a 32Bit machine with vanilla kernel 2.6.21.5.

Thanks in advance,
Regards - Ingo.

RE: howto create partitions bigger than 2TB

[Salyzyn, Mark]

Put a file system on the entire device, stop trying to partition it.

The standard DOS partition table is of no use to you above 2TB.

Sincerely -- Mark Salyzyn

> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org 
> [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Ingo Freund
> Sent: Friday, July 13, 2007 8:55 AM
> To: linux-kernel@vger.kernel.org
> Subject: howto create partitions bigger than 2TB 
> 
> Hi
> 
> I've got a RAID5 (driver aacraid for an ICP9047MA) with four
> 750GB hdds which provides a 2.25TB sized device.
> None of the until now used tools will work with that device.
> fdisk complains about missing cylinder count.
> cfdisk misses the device size.
> parted shows the right device size but only creates a partion
> with 51GB.
> What am I supposed to do to work with this device?
> Which fs can handle it?
> (CONFIG LARGE BLOCK is on)
> We are talking about a 32Bit machine with vanilla kernel 2.6.21.5.
> 
> Thanks in advance,
> Regards - Ingo.
> -
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Re: howto create partitions bigger than 2TB

[Mark Lord]

Ingo Freund wrote:
> Hi
> 
> I've got a RAID5 (driver aacraid for an ICP9047MA) with four
> 750GB hdds which provides a 2.25TB sized device.
> None of the until now used tools will work with that device.
> fdisk complains about missing cylinder count.
> cfdisk misses the device size.
> parted shows the right device size but only creates a partion
> with 51GB.
> What am I supposed to do to work with this device?

Create a single RAID which covers the entire drive set
(as it sounds like you have already done).

Then use LVM on top of that, instead of conventional partitions.

-ml

Re: howto create partitions bigger than 2TB

[H. Peter Anvin]

Ingo Freund wrote:
> Hi
> 
> I've got a RAID5 (driver aacraid for an ICP9047MA) with four
> 750GB hdds which provides a 2.25TB sized device.
> None of the until now used tools will work with that device.
> fdisk complains about missing cylinder count.
> cfdisk misses the device size.
> parted shows the right device size but only creates a partion
> with 51GB.
> What am I supposed to do to work with this device?
> Which fs can handle it?
> (CONFIG LARGE BLOCK is on)
> We are talking about a 32Bit machine with vanilla kernel 2.6.21.5.
> 

You have to use GPT partitions instead of DOS partitions (although you
may have to leave your /boot as an DOS partitions, this is supposed to
be possible as the two partitioning schemes are designed to coexist, but
I don't think parted has support for it yet.)

	-hpa

Re: howto create partitions bigger than 2TB

[Ingo Freund]

On 14.07.2007 00:52, H. Peter Anvin wrote (please find the answer below the original text):
> Ingo Freund wrote:
>> Hi
>>
>> I've got a RAID5 (driver aacraid for an ICP9047MA) with four
>> 750GB hdds which provides a 2.25TB sized device.
>> None of the until now used tools will work with that device.
>> fdisk complains about missing cylinder count.
>> cfdisk misses the device size.
>> parted shows the right device size but only creates a partion
>> with 51GB.
>> What am I supposed to do to work with this device?
>> Which fs can handle it?
>> (CONFIG LARGE BLOCK is on)
>> We are talking about a 32Bit machine with vanilla kernel 2.6.21.5.
>>
> 
> You have to use GPT partitions instead of DOS partitions (although you
> may have to leave your /boot as an DOS partitions, this is supposed to
> be possible as the two partitioning schemes are designed to coexist, but
> I don't think parted has support for it yet.)
> 

This is the solution (for use as a data container on a backup machine):

parted /dev/sdb:
(parted) mklabel gpt
(parted) mkpart p 0 100%
(parted) quit
mkreiserfs /dev/sdb1
...and all seems to work.

Thank you all very much for your hints.

Regards - Ingo.

Re: howto create partitions bigger than 2TB

[Jesper Juhl]

On 17/07/07, Ingo Freund <linux-kernel-news@e-dict.net> wrote:
> On 14.07.2007 00:52, H. Peter Anvin wrote (please find the answer below the original text):
> > Ingo Freund wrote:
> >> Hi
> >>
> >> I've got a RAID5 (driver aacraid for an ICP9047MA) with four
> >> 750GB hdds which provides a 2.25TB sized device.
> >> None of the until now used tools will work with that device.
> >> fdisk complains about missing cylinder count.
> >> cfdisk misses the device size.
> >> parted shows the right device size but only creates a partion
> >> with 51GB.
> >> What am I supposed to do to work with this device?
> >> Which fs can handle it?
> >> (CONFIG LARGE BLOCK is on)
> >> We are talking about a 32Bit machine with vanilla kernel 2.6.21.5.
> >>
> >
> > You have to use GPT partitions instead of DOS partitions (although you
> > may have to leave your /boot as an DOS partitions, this is supposed to
> > be possible as the two partitioning schemes are designed to coexist, but
> > I don't think parted has support for it yet.)
> >
>
> This is the solution (for use as a data container on a backup machine):
>
> parted /dev/sdb:
> (parted) mklabel gpt
> (parted) mkpart p 0 100%
> (parted) quit
> mkreiserfs /dev/sdb1
> ...and all seems to work.
>

Why not simply
mkreiserfs /dev/sdb
and forget about partitions entirely?

-- 
Jesper Juhl <jesper.juhl@gmail.com>
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