[Gluster-users] usage of harddisks: each hdd a brick? raid?

[Amar Tumballi Suryanarayan]

On Thu, Jan 10, 2019 at 1:56 PM Hu Bert <revirii at googlemail.com> wrote:

> Hi,
>
> > > We ara also using 10TB disks, heal takes 7-8 days.
> > > You can play with "cluster.shd-max-threads" setting. It is default 1 I
> > > think. I am using it with 4.
> > > Below you can find more info:
> > > https://access.redhat.com/solutions/882233
> > cluster.shd-max-threads: 8
> > cluster.shd-wait-qlength: 10000
>
> Our setup:
> cluster.shd-max-threads: 2
> cluster.shd-wait-qlength: 10000
>
> > >> Volume Name: shared
> > >> Type: Distributed-Replicate
> > A, you have distributed-replicated volume, but I choose only replicated
> > (for beginning simplicity :)
> > May be replicated volume are healing faster?
>
> Well, maybe our setup with 3 servers and 4 disks=bricks == 12 bricks,
> resulting in a distributed-replicate volume (all /dev/sd{a,b,c,d}
> identical) , isn't optimal? And it would be better to create a
> replicate 3 volume with only 1 (big) brick per server (with 4 disks:
> either a logical volume or sw/hw raid)?
>
> But it would be interesting to know if a replicate volume is healing
> faster than a distributed-replicate volume - even if there was only 1
> faulty brick.
>
>
We don't have any data point to agree to this, but it may be true.
Specially, as the crawling when DHT (ie, distribute) is involved can get
little slower, which means, the healing would get slower too.

We are trying to experiment few performance enhancement patches (like
https://review.gluster.org/20636), would be great to see how things work
with newer base. Will keep the list updated about performance numbers once
we have some more data on them.

-Amar


>
> Thx
> Hubert
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>
>

-- 
Amar Tumballi (amarts)
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