[Gluster-users] [External] Re: anyone using gluster-block?

[Davide Obbi]

Hi Vijay,

The Volume has been created using heketi-cli blockvolume create command.
The block config is the config applied by heketi out of the box and in my
case ended up to be:
- 3 nodes each with 1 brick
- the brick is carved from a VG with a single PV
- the PV consists of a 1.2TB SSD, not partitioned and no HW RAID behind
- the volume does not have any custom setting aside what configured in
/etc/glusterfs/group-gluster-block by default
performance.quick-read=off
performance.read-ahead=off
performance.io-cache=off
performance.stat-prefetch=off
performance.open-behind=off
performance.readdir-ahead=off
performance.strict-o-direct=on
network.remote-dio=disable
cluster.eager-lock=enable
cluster.quorum-type=auto
cluster.data-self-heal-algorithm=full
cluster.locking-scheme=granular
cluster.shd-max-threads=8
cluster.shd-wait-qlength=10000
features.shard=on
features.shard-block-size=64MB
user.cifs=off
server.allow-insecure=on
cluster.choose-local=off

Kernel: 3.10.0-862.11.6.el7.x86_64
OS: Centos 7.5.1804
tcmu-runner: 0.2rc4.el7

Each node has 32 cores and 128GB RAM and 10Gb connection.

What i am trying to understand is what should be performance expectations
with gluster-block since i couldnt find many benchmarks online.

Regards
Davide


On Fri, Nov 9, 2018 at 7:07 AM Vijay Bellur <vbellur at redhat.com> wrote:

> Hi Davide,
>
> Can you please share the block hosting volume configuration?
>
> Also, more details about the kernel and tcmu-runner versions could help in
> understanding the problem better.
>
> Thanks,
> Vijay
>
> On Tue, Nov 6, 2018 at 6:16 AM Davide Obbi <davide.obbi at booking.com>
> wrote:
>
>> Hi,
>>
>> i am testing gluster-block and i am wondering if someone has used it and
>> have some feedback regarding its performance.. just to set some
>> expectations... for example:
>> - i have deployed a block volume using heketi on a 3 nodes gluster4.1
>> cluster. it's a replica3 volume.
>> - i have mounted via iscsi using multipath config suggested, created
>> vg/lv and put xfs on it
>> - all done without touching any volume setting or customizing xfs
>> parameters etc..
>> - all baremetal running on 10Gb, gluster has a single block device, SSD
>> in use by heketi
>>
>> so i tried a dd and i get a 4.7 MB/s?
>> - on the gluster nodes i have in write ~200iops, ~15MB/s, 75% util steady
>> and spiky await time up to 100ms alternating between the servers. CPUs are
>> mostly idle but there is some waiting...
>> - Glusterd and fsd utilization is below 1%
>>
>> The thing is that a gluster fuse mount on same platform does not have
>> this slowness so there must be something wrong with my understanding of
>> gluster-block?
>>
>>
>>
>>
>>
>> _______________________________________________
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>> Gluster-users at gluster.org
>> https://lists.gluster.org/mailman/listinfo/gluster-users
>
>

-- 
Davide Obbi
System Administrator

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