[Gluster-users] anyone using gluster-block?

Vijay Bellur
Fri, 09 Nov 2018 06:07:25 -0000

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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