More details on the tests you ran, and also gluster profile data while you were running the tests can help analyse.
Similar to my request to another user on thread, you can also help provide some feedback on the data gathering ansible scripts by trying out https://github.com/gluster/gluster-ansible-maintenance/pull/4
These scripts gather data from the hosts, and perform I/O tests on the VM. +Sachidananda URS 

On Thu, Aug 15, 2019 at 1:39 PM <lyubomir.grancharov@bottleshipvfx.com> wrote:
Hi folks,

 I have been experimenting with oVirt cluster based on glusterfs for the past few days. (first-timer). The cluster is up and running and it consists of 4 nodes and has 4 replicas. When I try to deploy Windows Server VM I encounter the following issue: The disk of the VM has ok reading speed ( close to bare metal) but the writing speed is very slow. ( about 10 times slower than it is supposed to be). Can anyone give me any suggestion, please? Thanks in advance! Here are the settings of the glusterfs volume:

Volume Name: bottle-volume
Type: Replicate
Volume ID: 869b8d1e-1266-4820-8dcd-4fea92346b90
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 4 = 4
Transport-type: tcp
Bricks:
Brick1: cnode01.bottleship.local:/gluster_bricks/brick-cnode01/brick-cnode01
Brick2: cnode02.bottleship.local:/gluster_bricks/brick-cnode02/brick-cnode02
Brick3: cnode03.bottleship.local:/gluster_bricks/brick-cnode03/brick-cnode03
Brick4: cnode04.bottleship.local:/gluster_bricks/brick-cnode04/brick-cnode04
Options Reconfigured:
network.ping-timeout: 30
cluster.granular-entry-heal: enable
performance.strict-o-direct: on
storage.owner-gid: 36
storage.owner-uid: 36
server.event-threads: 4
client.event-threads: 4
cluster.choose-local: off
features.shard: on
cluster.shd-wait-qlength: 10000
cluster.shd-max-threads: 8
cluster.locking-scheme: granular
cluster.data-self-heal-algorithm: full
cluster.server-quorum-type: server
cluster.quorum-type: auto
cluster.eager-lock: enable
network.remote-dio: off
performance.low-prio-threads: 32
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
auth.allow: *
user.cifs: off
transport.address-family: inet
nfs.disable: on
performance.client-io-threads: off
server.allow-insecure: on

Please let me know if you need any more configuration info or hardware specs.

best,

Lyubo
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