[Gluster-users] Slow read performance

[Bryan Whitehead]

This is clearly something Linus should support (forcing ext4 fix). There is
an ethos Linus always champions and that is *never* break userspace. NEVER.
Clearly this ext4 change has broken userspace. GlusterFS is not in the
kernel at all and this change has broken it.


On Mon, Mar 11, 2013 at 11:34 AM, Rodrigo Severo <
rodrigo at fabricadeideias.com> wrote:

> If you prefer to say that Linus recent statement isn't pertinent to
> Gluster x ext4 issue (as I do), or that ext4 developers are being
> hypocritical/ignoring Linus orientation (as you do) or anything similar
> isn't really relevant any more.
>
> This argument could have been important in March 2012, the month the ext4
> change as applied. Today, March 2013, or Gluster devs decides to assume
> it's incompatible with ext4 and states it clearly in it's installations and
> migration documentation, or fixes it's current issues with ext4. No matter
> what is done, it should have been done months ago.
>
>
> Regards,
>
> Rodrigo Severo
>
>
>
>
> On Mon, Mar 11, 2013 at 2:49 PM, John Mark Walker <johnmark at redhat.com>wrote:
>
>>
>> ------------------------------
>>
>> I know where this statement came from. I believe you are both:
>>
>>    - trying to apply some statement on a context it's not pertinent to
>>    and
>>
>>
>> No, it's actually quite applicable. I'm aware of the context of that
>> statement by Linus, and it applies to this case. Kernel devs, at least the
>> ext4 maintainers, are being hypocritical.
>>
>> There were a few exchanges between Ted T'so and Avati, among other
>> people, on gluster-devel. I highly recommend you read them:
>> http://lists.nongnu.org/archive/html/gluster-devel/2013-02/msg00050.html
>>
>>
>>
>>    - fouling yourself and/or others arguing that this issue will/should
>>    be fixed in the kernel.
>>
>>
>> This is probably true. I'm *this* close to declaring that, at least for
>> the Gluster community, ext4 is considered harmful. There's a reason Red Hat
>> started pushing XFS over ext4 a few years ago.
>>
>> And Red Hat isn't alone here.
>>
>> The ext4 hash size change was applied in the kernel an year ago. I don't
>> believe it will be undone. Gluster developers could argue that this change
>> was hard on them, and that it shouldn't be backported to Enterprise kernels
>> but after one year not having fixed it is on Gluster developers. Arguing
>> otherwise seems rather foolish to me.
>>
>>
>> I think that's a legitimate argument to make. This is a conversation that
>> is worth taking up on gluster-devel. But I'm not sure what can be done
>> about it, seeing as how the ext4 maintainers are not likely to make the
>> change.
>>
>> Frankly, dropping ext4 as an FS we can recommend solves a lot of
>> headaches.
>>
>> -JM
>>
>>
>>
>
>
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