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

Davide Obbi davide.obbi at booking.com
Fri Nov 9 08:35:59 UTC 2018

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

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.


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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Davide Obbi
System Administrator

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