XFS on x86_64 Linux Question

XFS on x86_64 Linux Question

[Justin Piszcz]

Hello--

Had a quick question, if I re-provision a host with an Intel Core Duo CPU 
with x86_64 Linux; I create a software raid array and use the XFS 
filesystem-- all in 64bit space...

If I boot a recovery image such as Knoppix, it will not be able to work on 
the filesystem correct?  I would need a 64bit live CD?

Does the same apply to software raid?  Can I mount a software raid created 
in a 64bit environment in a 32bit environment?

Justin.

Re: XFS on x86_64 Linux Question

[Justin Piszcz]

With correct CC'd address.


On Sat, 28 Apr 2007, Justin Piszcz wrote:

> Hello--
>
> Had a quick question, if I re-provision a host with an Intel Core Duo CPU 
> with x86_64 Linux; I create a software raid array and use the XFS 
> filesystem-- all in 64bit space...
>
> If I boot a recovery image such as Knoppix, it will not be able to work on 
> the filesystem correct?  I would need a 64bit live CD?
>
> Does the same apply to software raid?  Can I mount a software raid created in 
> a 64bit environment in a 32bit environment?
>
> Justin.
>

Re: XFS on x86_64 Linux Question

[Raz Ben-Jehuda(caro)]

Justin hello
I have tested 32 to 64 bit porting of linux raid5 and xfs and LVM
it worked. though i cannot say I have tested throughly. it was a POC.

On 4/28/07, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
> With correct CC'd address.
>
>
> On Sat, 28 Apr 2007, Justin Piszcz wrote:
>
> > Hello--
> >
> > Had a quick question, if I re-provision a host with an Intel Core Duo CPU
> > with x86_64 Linux; I create a software raid array and use the XFS
> > filesystem-- all in 64bit space...
> >
> > If I boot a recovery image such as Knoppix, it will not be able to work on
> > the filesystem correct?  I would need a 64bit live CD?
> >
> > Does the same apply to software raid?  Can I mount a software raid created in
> > a 64bit environment in a 32bit environment?
> >
> > Justin.
> >
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>


-- 
Raz

Re: XFS on x86_64 Linux Question

[Justin Piszcz]

Wow, probably better to stick with 32bit then?

On Sat, 28 Apr 2007, Raz Ben-Jehuda(caro) wrote:

> Justin hello
> I have tested 32 to 64 bit porting of linux raid5 and xfs and LVM
> it worked. though i cannot say I have tested throughly. it was a POC.
>
> On 4/28/07, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
>> With correct CC'd address.
>> 
>> 
>> On Sat, 28 Apr 2007, Justin Piszcz wrote:
>> 
>> > Hello--
>> >
>> > Had a quick question, if I re-provision a host with an Intel Core Duo CPU
>> > with x86_64 Linux; I create a software raid array and use the XFS
>> > filesystem-- all in 64bit space...
>> >
>> > If I boot a recovery image such as Knoppix, it will not be able to work 
>> on
>> > the filesystem correct?  I would need a 64bit live CD?
>> >
>> > Does the same apply to software raid?  Can I mount a software raid 
>> created in
>> > a 64bit environment in a 32bit environment?
>> >
>> > Justin.
>> >
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> 
>
>
> -- 
> Raz
>

Re: XFS on x86_64 Linux Question

[Justin Piszcz]

On Sat, 28 Apr 2007, Andi Kleen wrote:

> Justin Piszcz <jpiszcz@lucidpixels.com> writes:
>
>> Had a quick question, if I re-provision a host with an Intel Core Duo
>> CPU with x86_64 Linux; I create a software raid array and use the XFS
>> filesystem-- all in 64bit space...
>>
>> If I boot a recovery image such as Knoppix, it will not be able to
>> work on the filesystem correct?  I would need a 64bit live CD?
>
> There used to be a XFS bug that 32bit journals couldn't
> be replayed on 64bit and vice versa. This means you couldn't mount
> a dirty file system on the other architecture. But this bug has been
> long fixed and mounting clean file systems always worked.
>
> -Andi
>

Thanks for the prompt reply!  I have more confidence in trying x86_64 now 
:)

Justin.

Re: XFS on x86_64 Linux Question

[Andi Kleen]

Justin Piszcz <jpiszcz@lucidpixels.com> writes:

> Had a quick question, if I re-provision a host with an Intel Core Duo
> CPU with x86_64 Linux; I create a software raid array and use the XFS
> filesystem-- all in 64bit space...
> 
> If I boot a recovery image such as Knoppix, it will not be able to
> work on the filesystem correct?  I would need a 64bit live CD?

There used to be a XFS bug that 32bit journals couldn't 
be replayed on 64bit and vice versa. This means you couldn't mount
a dirty file system on the other architecture. But this bug has been 
long fixed and mounting clean file systems always worked.

-Andi