Support for 4 KiB disk sectors in Linux kernel

Support for 4 KiB disk sectors in Linux kernel

[Lukasz Dorau]

Hi

Where can I find information about current status of support for 4 KiB 
disk sectors in Linux kernel?
Is there a leader/maintainer of this issue in community?

Regards,
Lukasz

Re: Support for 4 KiB disk sectors in Linux kernel

[Jeff Moyer]

Lukasz Dorau <lukasz.dorau@intel.com> writes:

> Hi
>
> Where can I find information about current status of support for 4 KiB
> disk sectors in Linux kernel?
> Is there a leader/maintainer of this issue in community?

4KB sector devices work just fine.  Are you experiencing any issues in
particular?

Cheers,
Jeff

Re: Support for 4 KiB disk sectors in Linux kernel

[Martin K. Petersen]

>>>>> "Lukasz" == Lukasz Dorau <lukasz.dorau@intel.com> writes:

Lukasz> Where can I find information about current status of support for
Lukasz> 4 KiB disk sectors in Linux kernel?  Is there a
Lukasz> leader/maintainer of this issue in community?

We have supported 4Kn for a decade. 512e obviously works out of the
box. However, filesystem/partition/DM tooling has been updated to align
correctly on 512e devices.

See:

	http://oss.oracle.com/~mkp/docs/linux-advanced-storage.pdf

-- 
Martin K. Petersen	Oracle Linux Engineering

Re: Support for 4 KiB disk sectors in Linux kernel

[Martin Mokrejs]

Martin K. Petersen wrote:
>>>>>> "Lukasz" == Lukasz Dorau <lukasz.dorau@intel.com> writes:
> 
> Lukasz> Where can I find information about current status of support for
> Lukasz> 4 KiB disk sectors in Linux kernel?  Is there a
> Lukasz> leader/maintainer of this issue in community?
> 
> We have supported 4Kn for a decade. 512e obviously works out of the
> box. However, filesystem/partition/DM tooling has been updated to align
> correctly on 512e devices.
> 
> See:
> 
> 	http://oss.oracle.com/~mkp/docs/linux-advanced-storage.pdf

Also:

https://ata.wiki.kernel.org/articles/a/t/a/ATA_4_KiB_sector_issues_d4b8.html
http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot_Problems:Windows_Writes_To_MBR
https://help.ubuntu.com/community/Grub2


I agree there is nothing about under Documentation/ in kernel sources, at least
from users point of view.
Martin

RE: Support for 4 KiB disk sectors in Linux kernel

[Dorau, Lukasz]

On Friday, April 20, 2012 5:22 PM Jeff Moyer <jmoyer@redhat.com> wrote:
> 
> Lukasz Dorau <lukasz.dorau@intel.com> writes:
> 
> > Hi
> >
> > Where can I find information about current status of support for 4 KiB
> > disk sectors in Linux kernel?
> > Is there a leader/maintainer of this issue in community?
> 
> 4KB sector devices work just fine.  Are you experiencing any issues in
> particular?
> 

No, no issues. Thanks. 

Regards,
Lukasz

RE: Support for 4 KiB disk sectors in Linux kernel

[Dorau, Lukasz]

On Friday, April 20, 2012 7:22 PM Martin Mokrejs wrote:
> 
> Martin K. Petersen wrote:
> >>>>>> "Lukasz" == Lukasz Dorau <lukasz.dorau@intel.com> writes:
> >
> > Lukasz> Where can I find information about current status of support for
> > Lukasz> 4 KiB disk sectors in Linux kernel?  Is there a
> > Lukasz> leader/maintainer of this issue in community?
> >
> > We have supported 4Kn for a decade. 512e obviously works out of the
> > box. However, filesystem/partition/DM tooling has been updated to align
> > correctly on 512e devices.
> >
> > See:
> >
> > 	http://oss.oracle.com/~mkp/docs/linux-advanced-storage.pdf
> 
> Also:
> 
> https://ata.wiki.kernel.org/articles/a/t/a/ATA_4_KiB_sector_issues_d4b8.ht
> ml
> http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot
> _Problems:Windows_Writes_To_MBR
> https://help.ubuntu.com/community/Grub2
> 
> 
> I agree there is nothing about under Documentation/ in kernel sources, at
> least
> from users point of view.
> Martin
> --

Thanks a lot! 

Regards,
Lukasz

RE: Support for 4 KiB disk sectors in Linux kernel

[Dorau, Lukasz]

On Friday, April 20, 2012 7:22 PM Martin Mokrejs wrote:
> 
> Martin K. Petersen wrote:
> >>>>>> "Lukasz" == Lukasz Dorau <lukasz.dorau@intel.com> writes:
> >
> > Lukasz> Where can I find information about current status of support for
> > Lukasz> 4 KiB disk sectors in Linux kernel?  Is there a
> > Lukasz> leader/maintainer of this issue in community?
> >
> > We have supported 4Kn for a decade. 512e obviously works out of the
> > box. However, filesystem/partition/DM tooling has been updated to align
> > correctly on 512e devices.
> >

Does it mean that I can just plug the 4K HDD in and it will work without making any changes in kernel?

Lukasz

> > See:
> >
> > 	http://oss.oracle.com/~mkp/docs/linux-advanced-storage.pdf
> 
> Also:
> 
> https://ata.wiki.kernel.org/articles/a/t/a/ATA_4_KiB_sector_issues_d4b8.ht
> ml
> http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot
> _Problems:Windows_Writes_To_MBR
> https://help.ubuntu.com/community/Grub2
> 
> 
> I agree there is nothing about under Documentation/ in kernel sources, at
> least
> from users point of view.
> Martin
> --
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Support for 4 KiB disk sectors in Linux kernel

[Martin Mokrejs]

Dorau, Lukasz wrote:
> On Friday, April 20, 2012 7:22 PM Martin Mokrejs wrote:
>>
>> Martin K. Petersen wrote:
>>>>>>>> "Lukasz" == Lukasz Dorau <lukasz.dorau@intel.com> writes:
>>>
>>> Lukasz> Where can I find information about current status of support for
>>> Lukasz> 4 KiB disk sectors in Linux kernel?  Is there a
>>> Lukasz> leader/maintainer of this issue in community?
>>>
>>> We have supported 4Kn for a decade. 512e obviously works out of the
>>> box. However, filesystem/partition/DM tooling has been updated to align
>>> correctly on 512e devices.
>>>
> 
> Does it mean that I can just plug the 4K HDD in and it will work without making any changes in kernel?

Yes, only make sure you have recent enough fdisk/gdisk or other partition
manager and make first partition start at sector 2048 (instead of former
default start sector 63) to be sure you will have no alignment issues.

If you use EFI partition instead of the MS-DOS type which cannot span 2TB
drives already, you will need CONFIG_EFI_PARTITION=y and gdisk installed
and forget about fdisk.
Martin


> 
> Lukasz
> 
>>> See:
>>>
>>> 	http://oss.oracle.com/~mkp/docs/linux-advanced-storage.pdf
>>
>> Also:
>>
>> https://ata.wiki.kernel.org/articles/a/t/a/ATA_4_KiB_sector_issues_d4b8.ht
>> ml
>> http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot
>> _Problems:Windows_Writes_To_MBR
>> https://help.ubuntu.com/community/Grub2
>>
>>
>> I agree there is nothing about under Documentation/ in kernel sources, at
>> least
>> from users point of view.
>> Martin
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Support for 4 KiB disk sectors in Linux kernel

[Dan Williams]

On Fri, Apr 27, 2012 at 5:14 AM, Dorau, Lukasz <lukasz.dorau@intel.com> wrote:
> On Friday, April 20, 2012 7:22 PM Martin Mokrejs wrote:
>>
>> Martin K. Petersen wrote:
>> >>>>>> "Lukasz" == Lukasz Dorau <lukasz.dorau@intel.com> writes:
>> >
>> > Lukasz> Where can I find information about current status of support for
>> > Lukasz> 4 KiB disk sectors in Linux kernel?  Is there a
>> > Lukasz> leader/maintainer of this issue in community?
>> >
>> > We have supported 4Kn for a decade. 512e obviously works out of the
>> > box. However, filesystem/partition/DM tooling has been updated to align
>> > correctly on 512e devices.
>> >
>
> Does it mean that I can just plug the 4K HDD in and it will work without making any changes in kernel?
>

See sd_read_capacity() in drivers/scsi/sd.c

Support for 4 KiB disk sectors in Linux kernel

[Lukasz Dorau]

Hi

Where can I find information about current status of support for 4 KiB 
disk sectors in Linux kernel?
Is there a leader/maintainer of this issue in community?

Regards,
Lukasz