[Gluster-users] disperse volume brick counts limits in RHES

[Pranith Kumar Karampuri]

On Fri, May 5, 2017 at 5:19 PM, Pranith Kumar Karampuri <pkarampu at redhat.com
> wrote:

>
>
> On Fri, May 5, 2017 at 2:38 PM, Serkan Çoban <cobanserkan at gmail.com>
> wrote:
>
>> It is the over all time, 8TB data disk healed 2x faster in 8+2
>> configuration.
>>
>
> Wow, that is counter intuitive for me. I will need to explore about this
> to find out why that could be. Thanks a lot for this feedback!
>

>From memory I remember you said you have a lot of small files hosted on the
volume, right? It could be because of the bug
https://review.gluster.org/17151 is fixing. That is the only reason I could
guess right now. We will try to test this kind of case if you could give us
a bit more details about average file-size/depth of directories etc to
simulate similar looking directory structure.


>
>
>>
>> On Fri, May 5, 2017 at 10:00 AM, Pranith Kumar Karampuri
>> <pkarampu at redhat.com> wrote:
>> >
>> >
>> > On Fri, May 5, 2017 at 11:42 AM, Serkan Çoban <cobanserkan at gmail.com>
>> wrote:
>> >>
>> >> Healing gets slower as you increase m in m+n configuration.
>> >> We are using 16+4 configuration without any problems other then heal
>> >> speed.
>> >> I tested heal speed with 8+2 and 16+4 on 3.9.0 and see that heals on
>> >> 8+2 is faster by 2x.
>> >
>> >
>> > As you increase number of nodes that are participating in an EC set
>> number
>> > of parallel heals increase. Is the heal speed you saw improved per file
>> or
>> > the over all time it took to heal the data?
>> >
>> >>
>> >>
>> >>
>> >> On Fri, May 5, 2017 at 9:04 AM, Ashish Pandey <aspandey at redhat.com>
>> wrote:
>> >> >
>> >> > 8+2 and 8+3 configurations are not the limitation but just
>> suggestions.
>> >> > You can create 16+3 volume without any issue.
>> >> >
>> >> > Ashish
>> >> >
>> >> > ________________________________
>> >> > From: "Alastair Neil" <ajneil.tech at gmail.com>
>> >> > To: "gluster-users" <gluster-users at gluster.org>
>> >> > Sent: Friday, May 5, 2017 2:23:32 AM
>> >> > Subject: [Gluster-users] disperse volume brick counts limits in RHES
>> >> >
>> >> >
>> >> > Hi
>> >> >
>> >> > we are deploying a large (24node/45brick) cluster and noted that the
>> >> > RHES
>> >> > guidelines limit the number of data bricks in a disperse set to 8.
>> Is
>> >> > there
>> >> > any reason for this.  I am aware that you want this to be a power of
>> 2,
>> >> > but
>> >> > as we have a large number of nodes we were planning on going with
>> 16+3.
>> >> > Dropping to 8+2 or 8+3 will be a real waste for us.
>> >> >
>> >> > Thanks,
>> >> >
>> >> >
>> >> > Alastair
>> >> >
>> >> >
>> >> > _______________________________________________
>> >> > Gluster-users mailing list
>> >> > Gluster-users at gluster.org
>> >> > http://lists.gluster.org/mailman/listinfo/gluster-users
>> >> >
>> >> >
>> >> > _______________________________________________
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>> >> > Gluster-users at gluster.org
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>> >> _______________________________________________
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>> >> Gluster-users at gluster.org
>> >> http://lists.gluster.org/mailman/listinfo/gluster-users
>> >
>> >
>> >
>> >
>> > --
>> > Pranith
>>
>
>
>
> --
> Pranith
>



-- 
Pranith
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